JP6997479B1 - Water purification treatment system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water purification treatment system having a new structure.
A purification treatment unit installed in the water tank to be treated to purify the water to be treated, and an air diffuser installed in the water tank to be treated to aerate the water to be treated stored in the water tank to be treated. A water purification treatment system including a cleaning liquid tank and a cleaning liquid flow that are communicated with a compressed air supply device by an air supply pipe and supply a cleaning liquid for cleaning the purification treatment unit and the air diffuser. It is communicated by a road to supply compressed air from the compressed air supply device to the air diffuser and to the cleaning liquid flow path during the filtration treatment of the water to be treated or the cleaning of the purification treatment unit and the air diffuser. A water purification treatment system comprising a control means for controlling switching of supply of the cleaning liquid.
[Selection diagram] Fig. 1

Description

The present invention relates to a water purification treatment system.

The membrane separation activated sludge method (MBR: Membrane Bioreactor) is known as one of the methods for purifying sewage and wastewater. In MBR, treated water and activated sludge are separated by a separation membrane such as a microfiltration membrane or an ultrafiltration membrane, but it is necessary to clean the separation membrane regularly to prevent clogging of the separation membrane.

In Patent Document 1, the cleaning flux for supplying the second cleaning water containing ozone is controlled to be higher than the cleaning flux for supplying the first cleaning water containing sodium hypochlorite, and the state of drainage is adjusted. A membrane separation active sludge system that can realize flexible backwashing according to the situation has been proposed.

Patent Document 2 proposes a method in which two or more kinds of concentrated chemicals are stored in different chemical tanks, and two or more kinds of cleaning solutions are passed through a switching valve to clean the separation membrane unit.

Japanese Patent No. 6617860 Japanese Unexamined Patent Publication No. 2005-193132

In addition to the ones proposed above, it is desired to propose a water purification treatment system with a new structure.

It is an object of the present invention to provide a water purification treatment system having a novel structure.

[1]
A purification treatment unit installed in the water tank to be treated to purify the water to be treated, and an aeration device installed in the water tank to be treated to aerate the water to be treated stored in the water tank to be treated. It is a water purification treatment system that is equipped.
The purification treatment unit is communicated with a cleaning liquid tank for supplying a cleaning liquid for cleaning the purification treatment unit and the air diffuser by a cleaning liquid flow path.
The air diffuser is communicated with the compressed air supply device by an air supply pipe, and is also communicated with the cleaning liquid tank by a cleaning liquid flow path .
A control means for controlling switching between the supply of compressed air from the compressed air supply device to the air diffuser and the supply of the cleaning liquid from the cleaning liquid tank to the purification processing unit and the air diffuser is provided .
The control means is
At the time of cleaning the purification treatment unit, the cleaning liquid is supplied from the cleaning liquid tank to the purification treatment unit and the compressed air is supplied from the compressed air supply device to the air diffuser at the same time.
A water purification treatment system characterized by this.

According to the present invention, it is possible to provide a water purification treatment system having a novel structure.

It is a figure which shows an example of the structure of the water purification treatment system of this embodiment. It is a figure which shows an example of the purification process of sludge. It is a figure which shows an example of the cleaning process of a purification process unit. It is a figure which shows an example of the cleaning process of an air diffuser. It shows another example of the structure of the water purification treatment system of this embodiment, and is the figure which omitted some elements. FIG. 5 is a diagram showing an example of a screen in the water purification treatment system of the illustrated embodiment. FIG. 1 or FIG. 5 is a perspective view showing an example of a purification treatment unit in the water purification treatment system of the illustrated embodiment. It shows another example of the structure of the water purification treatment system of this embodiment, and is the figure which omitted some elements. It is a figure showing an example of the structure of the air diffuser provided in the water purification treatment system of this embodiment, and is the enlarged view of the part shown by the broken line of (a) perspective view, (b) FIG. 9 (a). Both (a) and (b) are diagrams showing the operation of the air diffuser shown in FIG.

Hereinafter, an example of an embodiment of the present invention will be described with reference to the accompanying drawings.

(Embodiment 1)
[Configuration of water purification treatment system]
The water purification treatment system 1 of the present embodiment is a system that performs water purification treatment by the membrane separation active sludge method as an example, and as shown in FIG. 1, the water treatment tank 2, the purification treatment unit 3, the air diffuser 4, and the compression It is provided with an air supply device 12, a chemical liquid tank 14, and a diluted water tank 17.

The treated water tank 2 is a water tank that stores and purifies treated water such as domestic wastewater and industrial wastewater. The water tank 2 to be treated shown in FIG. 1 is connected to the water flow path 6 to be treated and the excess sludge discharge passage 11, respectively. The water to be treated 22 is introduced into the water flow path 6 to be treated by the water circulation pump 5 to be treated and flows into the water tank 2 to be treated. Further, the activated sludge that has become surplus due to the biofilm treatment of the water to be treated 22 by the purification treatment unit 3 is introduced into the surplus sludge discharge passage 11 by the surplus sludge discharge pump 10 and discharged.

The purification treatment unit 3 is a device including a membrane member that filters the water to be treated 22 and separates it into activated sludge containing pollutants and filtered water. In the present embodiment, as shown in FIG. 1, one or a plurality of purification treatment units 3 are installed so as to be immersed in the water to be treated 22 stored in the water tank 2 to be treated. Further, the purification treatment unit 3 is connected to the filtered water flow path 8. The filtered water filtered by the biological film treatment of the water to be treated 22 by the purification treatment unit 3 is introduced into the filtered water flow path 8 by the filtration pump 7 and the on-off valve 9a, and is stored in a filtered water tank (not shown). For the purification treatment unit 3 of the present embodiment, a film having a conventionally known shape such as a hollow thread film or a flat film can be adopted.

The air diffuser 4 is a device that aerates the water to be treated 22 stored in the water tank 2 to be treated or supplies compressed air for cleaning the purification treatment unit 3. In this embodiment, as shown in FIG. 1, a plurality of air diffusers 4 are arranged below each purification treatment unit 3. Further, each air diffuser 4 is connected to the air supply pipe 13, and the compressed air supplied from the compressed air supply device 12 is introduced into the air supply pipe 13 and the air diffuser 4 by the on-off valves 9b and 9c to disperse the air. The water to be treated 22 is aerated through the device 4, or compressed air is sent to the purification treatment unit 3. It should be noted that each air diffuser 4 is a unit air diffuser having a unit composed of a plurality of air diffusers 30.

The compressed air supply device 12 has a blower (maximum pressure of 1 kgf / cm ² ) or a compressor (maximum pressure of 3 to 5 kgf / cm ² ) depending on the state of consumption of the purification treatment unit 3 due to the purification treatment, for example, the state of blockage of the hollow fiber membrane. , Etc. are adopted.

The chemical solution tank 14 is a tank for storing the chemical solution constituting the cleaning solution for cleaning the purification treatment unit 3 and the air diffuser 4. The chemical solution tank 14 shown in FIG. 1 is connected to the chemical solution flow path 16. The chemical liquid flow path 16 is connected to the diluted water flow path 19a and is connected to the cleaning liquid flow path 20 via the mixer 21. The cleaning liquid flow path 20 is bifurcated, one is connected to the filtered water flow path 8 and the other is connected to the air supply pipe 13. The chemical solution is introduced into the chemical solution flow path 16 by the chemical solution pump 15 and the on-off valve 9f, and is supplied to the mixer 21. As the chemical solution of the present embodiment, a conventionally known one suitable for cleaning the purification treatment unit 3 such as sodium hypochlorite, ozone, etc. can be adopted. The chemical solution tank 14 may be used as a cleaning solution tank in which a cleaning solution prepared in advance is stored. In this case, in the form shown in FIG. 1, the diluted water flow path 19a and the mixer 21 are unnecessary, and the air diffuser 4 is communicated with the cleaning liquid tank and the cleaning liquid flow path 20.

The diluted water tank 17 is a tank for storing the diluted water constituting the diluted water for cleaning the air diffuser 4 and the cleaning liquid for cleaning the purification treatment unit 3. The diluted water tank 17 shown in FIG. 1 is connected to the diluted water channels 19a and 19b. One diluting water flow path 19a is connected to the chemical liquid flow path 16, and the other diluting water flow path 19b is connected to the air supply pipe 13. The diluted water is introduced into the diluted water flow path 19a by the diluted water pump 18a and the on-off valve 9 g, and is supplied to the mixer 21. Further, the diluted water is introduced into the diluted water flow path 19b and the air supply pipe 13 by the diluted water pump 18b and the on-off valve 9h, and is supplied to the air diffuser 4.

The chemical solution and the diluted water supplied to the mixer 21 are mixed to generate a washing solution. This cleaning liquid is introduced into the air supply pipe 13 and the filtered water flow path 8 by the cleaning liquid flow path 20 and the on-off valves 9d and 9e, and is supplied to the purification treatment unit 3 and the air diffuser 4.

The water purification treatment system 1 of the present embodiment has pumps 5, 7, 10, 15, 18a and 18b during the purification treatment of the water to be treated, the cleaning treatment of the purification treatment unit 3 and the cleaning treatment of the air diffuser 4. Each of the on-off valves 9a to 9h is provided with a control means (not shown) including a computer for controlling the operation of the compressed air supply device 12.

[Purification treatment of water to be treated]
An example of the purification treatment of the water to be treated by the water purification treatment system 1 of the present embodiment will be described with reference to FIG.

The control means controls the on-off valves 9a to 9c in the open state and the on-off valves 9d to 9h in the closed state, and operates the water circulation pump 5, the filtration pump 7, the excess sludge discharge pump 10, and the compressed air supply device 12. Then, the chemical liquid pump 15 and the diluted water pumps 18a and 18b are stopped.

By operating the water to be treated circulation pump 5, the water to be treated 22 is introduced into the water flow path 6 to be treated and flows into the water tank 2 to be treated.

The compressed air supplied from the compressed air supply device 12 is introduced into the air supply pipe 13 and the air diffuser 4, and aerates the water to be treated 22 via the air diffuser 4. In the aerated water to be treated 22, the activated sludge promotes absorption and decomposition of pollutants contained in the water to be treated 22, and the water to be treated 22 is purified.

In the purification treatment unit 3, the water to be treated 22 is filtered and separated into activated sludge containing a pollutant and filtered water. By operating the filtration pump 7, the filtered water is introduced into the filtered water flow path 8 and stored in a filtered water tank (not shown). Further, due to the operation of the surplus sludge discharge pump 10, the activated sludge that has become surplus due to the biofilm treatment of the water to be treated 22 by the purification treatment unit 3 is introduced into the surplus sludge discharge passage 11 and discharged.

[Cleaning treatment of purification treatment unit]
An example of the cleaning treatment of the purification treatment unit 3 by the water purification treatment system 1 of the present embodiment will be described with reference to FIG.

The control means controls the on-off valves 9a, 9d, 9h to the closed state and the on-off valves 9b, 9c, 9e to 9g to the open state, and operates the compressed air supply device 12, the chemical liquid pump 15, and the diluting water pump 18a. , The water circulation pump 5 to be treated, the filtration pump 7, the surplus sludge discharge pump 10, and the diluted water pump 18b are stopped.

The compressed air supplied from the compressed air supply device 12 is introduced into the air supply pipe 13 and the air diffuser 4, and the compressed air is sent to the purification processing unit 3 via the air diffuser 4. Dirt is removed by the contact of compressed air with the film surface of the purification treatment unit 3.

By operating the chemical solution pump 15, the chemical solution is introduced from the chemical solution tank 14 into the chemical solution flow path 16 and supplied to the mixer 21. Further, by operating the diluted water pump 18a, the diluted water is introduced from the diluted water tank 17 into the diluted water flow path 19a and supplied to the mixer 21.

The chemical solution and the diluted water supplied to the mixer 21 are mixed to generate a washing solution. This cleaning liquid is introduced into the cleaning liquid flow path 20 and the filtered water flow path 8 on the opening / closing valve 9e side, and is supplied to the purification processing unit 3. The purification treatment unit 3 is washed with the supplied cleaning liquid.

[Cleaning process of air diffuser]
An example of the cleaning treatment of the air diffuser 4 by the water purification treatment system 1 of the present embodiment will be described with reference to FIG.

The control means controls the on-off valves 9a, 9e, 9h in the closed state and the on-off valves 9b to 9d, 9f, 9g in the open state, operates the chemical solution pump 15, the diluted water pump 18a, and operates the chemical solution pump 15 and the diluted water pump 18a to operate the water circulation pump 5 to be treated. , The filtration pump 7, the surplus sludge discharge pump 10, the compressed air supply device 12, and the diluting water pump 18b are stopped.

By operating the chemical solution pump 15, the chemical solution is introduced from the chemical solution tank 14 into the chemical solution flow path 16 and supplied to the mixer 21. Further, by operating the diluted water pump 18a, the diluted water is introduced from the diluted water tank 17 into the diluted water flow path 19a and supplied to the mixer 21.

The chemical solution and the diluted water supplied to the mixer 21 are mixed to generate a washing solution. This cleaning liquid is introduced into the cleaning liquid flow path 20 and the air supply pipe 13 on the opening / closing valve 9d side, and is supplied to the air diffuser 4. The air diffuser 4 is washed with the supplied washing liquid.

Next, the control means controls the on-off valves 9a, 9d to 9g in the closed state and the on-off valves 9b, 9c, 9h in the open state, operates the diluting water pump 18b, and operates the water circulation pump 5 to be treated and the filtration pump. 7. The surplus sludge discharge pump 10, the compressed air supply device 12, the chemical liquid pump 15, and the diluting water pump 18a are stopped.

By operating the diluted water pump 18b, the diluted water is introduced from the diluted water tank 17 into the diluted water flow path 19b and the air supply pipe 13 and supplied to the air diffuser 4. The chemical solution remaining in the air diffuser 4 is removed by the supplied diluted solution.

As described above, in the water purification treatment system 1 of the first embodiment, the air diffuser 4 is communicated with the compressed air supply device 12 by the air supply pipe 13, and is communicated with the chemical liquid tank 14 by the cleaning liquid flow path 20 to supply compressed air. The functions of the device 12, the air supply pipe 13, and the air diffuser 4 are used for both the aeration of the water tank 2 to be treated and the cleaning of the purification treatment unit 3 and the air diffuser 4. Therefore, a space-saving water purification treatment system by the membrane separation activated sludge method is provided without constructing a configuration corresponding to the aeration of the water tank 2 to be treated and the cleaning functions of the purification treatment unit 3 and the air diffuser 4. be able to.

Further, by cleaning the purification treatment unit 3 with compressed air and a cleaning liquid, it is possible to reduce the cleaning cost by using only the cleaning liquid and suppress the deterioration of the purification treatment unit 3.

(Embodiment 2)
[Other configurations of water purification treatment system]
FIG. 5 shows a schematic configuration of an example of a combined water purification treatment system of a fixed bed method and a fluidized bed method, that is, a contact oxidation combination system, which is a water purification treatment system of the present invention, which is a fusion of a fixed bed method and a fluidized bed method. Is to explain.

In the embodiment shown in FIG. 5, the configurations of the water tank 2 to be treated and the purification treatment unit 3 are different from those of the first embodiment. Therefore, the same configurations as those of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. .. Further, the surplus sludge discharge flow path 11, the treated water circulation pump 5, the filtration pump 7, the surplus sludge discharge pump 10, the chemical liquid pump 15, and the diluted water pump 18, which are common to the first embodiment, are omitted in FIG. ..

A fluidized bed area in one water tank 2 for purification treatment in which the water to be treated 22 flows from the upstream side (left side in FIG. 5) to the downstream side (right side in FIG. 5). 23 and the fixed bed area 24 are arranged adjacent to each other, and the screen 25 is arranged at the boundary between the fluidized bed area 23 and the fixed bed area 24.

The screen 25 allows the water to be treated 22 to flow between the fluidized bed region 23 and the fixed bed region 24, while the fixed bed region 24 of the fluidized bed contact material 26 that flows in the fluidized bed region 23. It prevents the flow to.

At the bottom of the water tank 2 to be treated, a plurality of individually controlled air diffusers 4a to 4f are arranged from the upstream side to the downstream side. The air diffusers 4a to 4f are unit air diffusers having a unit composed of a plurality of air diffusers 30.

Individual control of each air diffuser 4a to 4f can be performed manually or automatically by the control means described in the first embodiment.

A plurality of contact materials 26 for a fluidized bed are charged into the fluidized bed region 23, and the contact material 26 for the fluidized bed is aerated by the air diffuser 4 provided in the fluidized bed region 23 to flow in the water to be treated 22 and flow. Purification treatment is performed by the floor method.

Here, the air diffuser 4a and the air diffuser 4b arranged in order from the upstream side in the fluidized bed region 23 are individually controlled, and the opening / closing valve 9i at the position shown by A in FIG. 5 is opened. By closing the on-off valve 9j at the position indicated by B in 5, an upward flow is generated in FIG. 5 only at the position where the air diffuser 4a is deployed, while the air diffuser 4b causes the air diffuser 4b. At the deployed position, a downward flow can be generated in FIG. 5.

In this way, the air diffusers 4a and 4b are individually controlled, and the air diffusers 4a to 4f arranged in order from the upstream side to the downstream side at the bottom of the water tank 2 to be treated are adjacent to each air diffuser. By controlling the contact material 26 for a fluidized bed to stop when one of 4a and 4b is performing an air diffuser operation, the contact material 26 for a fluidized bed is effectively flowed into the water to be treated 22 in the fluidized bed region 23. be able to.

In this way, the water to be treated 22, soluble organic pollutants, and suspended solids (Suspended Solids) (hereinafter, "SS" in the present specification are more efficiently applied to the biological film formed on the surface of the contact material 26 for a fluid bed. ”), Suspended solids in mixed liquids (hereinafter, may be referred to as“ MLSS ”in the present specification), etc. are allowed to come into contact with each other to improve the processing capacity.

In the fixed floor area 24, purification treatment by a fixed floor method is performed.

The purification treatment unit 3 fixedly arranged in the fixed floor region 24 is a honeycomb composed of a bundle of straight pipes extending in the vertical direction, for example, as shown in FIG. 7, in addition to the hollow fiber membrane and the flat membrane described in the first embodiment. It is composed of tubes. Further, such a honeycomb tube can also be used as the purification treatment unit 3 in the first embodiment.

By being aerated by the air diffuser 4 provided in the fixed floor region 24, the flow of the water to be treated 22 rising in each of the tubular portions 3a and 3a (FIG. 7) of the honeycomb tube is generated.

Also in the fixed floor region 24, the air diffusers 4c to 4f arranged in order from the upstream side to the downstream side are individually controlled, and the on-off valve 9k at the position shown by C in FIG. 5 is opened. By closing the on-off valve 9l at the position indicated by D in FIG. 5, the inside of each of the tubular portions 3a and 3a of the honeycomb tube at the position where the air diffuser 4c is deployed is upward in FIG. Each of the honeycomb tubes at the position where the air diffuser 4d is deployed, while creating the ascending current indicated by the arrow to supply the necessary oxygen to the microorganisms and efficiently take up SS and organic matter into the biological membrane. A downward flow indicated by a downward arrow in FIG. 5 is generated inside the tubular portions 3a and 3a to appropriately peel off excess sludge to efficiently purify the tubular portions 3a and 3a.

In the water purification treatment system 1 of the present embodiment, in both the fluidized bed region 23 and the fixed bed region 24, a plurality of aeration devices are arranged at the bottom of the water tank 2 to be treated from the upstream side to the downstream side. Full-scale aeration can be performed by 4a to 4b, or full-scale split aeration can be performed by dividing and aerating the entire surface by individually controlling the air diffusers 4a to 4f. As a result, a swirling flow, etc. is generated in the water to be treated 22, and the treatment efficiency is improved.

As the contact material 26 for a fluidized bed, various conventionally known contact materials can be used as long as microorganisms can adhere to and inhabit them. For example, a carrier filter medium for a fluidized bed made of polypropylene or polyurethane can be adopted.

A plurality of such contact materials 26 for a fluidized bed are charged into the fluidized bed region 23, for example, at a ratio of 280000 pieces / m ³ and a filling rate of 20 to 40%.

FIG. 7 is a perspective view illustrating a part of the structure in the case where the purification treatment unit 3 is composed of a honeycomb tube composed of a bundle of straight tubes extending in the vertical direction. The honeycomb tube is made of, for example, vinyl chloride, and in the state shown in FIG. 7, for example, width: 500 mm, length: 1000 mm, height: 1000 mm, specific surface area: 133 m ² / m ³ (30 cells), weight: 27 kg. It can be / m ³ (230 microns).

Such a honeycomb tube shown in FIG. 7 is fixedly deployed in the fixed floor region 24, for example, with a filling rate of 80%.

FIG. 6 illustrates the screen 25. As described above, the screen 25 enables the flow of the water to be treated 22 between the fluidized bed region 23 and the fixed bed region 24, while the fluidized bed contact material 26 that flows in the fluidized bed region 23. Is intended to prevent the flow of water into the fixed bed area 24.

In the case of water purification treatment by biofilm treatment, the larger the surface area of the contact material, the more microorganisms settle on the surface of the contact material, and the treatment capacity increases. Therefore, in the fluidized bed method of biofilm treatment, the contact material is made hollow or has a structure having a large porosity, so that the contact material can be made smaller and the surface area can be increased.

Further, in the case of the fluidized bed method biofilm treatment, a screen for preventing the outflow of the fluidized bed contact material 26 is installed so that the fluidized bed contact material 26 flowing in the fluidized bed region 23 does not flow out from the fluidized bed region 23. However, when the fluidized bed contact material 26 is miniaturized for the purpose of increasing the specific surface area, it is necessary to miniaturize the mesh width of the screen in accordance with the miniaturization of the fluidized bed contact material 26. In this case, if the mesh width of the screen is reduced, the biofilm adheres to and inhabits the screen itself and becomes clogged when the inflowing SS concentration is high, the drainage is viscous, or the drainage has a heavy load. There is a problem that the smooth flow of the treated water from the upstream side to the downstream side is hindered.

In the present embodiment, the fluidized bed area 23 and the fixed bed area 24 are allowed to flow in one water tank 2 to be treated, and the water to be treated 22 is allowed to flow between the fluidized bed area 23 and the fixed bed area 24. On the other hand, this problem is solved by arranging the contact material 26 for a fluidized bed that flows in the fluidized bed region 23 adjacent to the screen 25 that prevents the contact material 26 from flowing to the fixed bed region 24. ..

Here, while allowing the water to be treated 22 to flow between the fluidized bed region 23 and the fixed bed region 24, the fluidized bed contact material 26 that flows in the fluidized bed region 23 reaches the fixed bed region 24. As for the screen that blocks the flow of water, as mentioned above, it is desirable to make the contact material smaller and increase the surface area, but it is considered to avoid the occurrence of clogging of the screen itself. It is desirable to have a mesh width.

In the present embodiment, the inventors have described the fluidized bed region 23 to the fixed bed region 24 or the fixed bed region 24 to the fluidized bed 24 of the water to be treated 22 via the screen 25 as described later by aeration by the air diffuser 4. Forcibly generated by forcibly causing flow to the region 23, by reducing the size of the contact material 26 for the fluidized bed to increase the surface area, and by aeration by the aeration device 4 in the fluidized bed region 23. Considering the effects of fluidized bed (full-scale aeration, full-scale split aeration, swirling flow, etc.), the mesh width of the screen 25 should be about half the outer size of the fluidized bed contact material 26. , It was confirmed that it is desirable in terms of water purification effect and water treatment efficiency.

FIG. 6 shows, as an example of the screen 25 when the fluidized bed contact material 26 is used, a gap 25b of 5 mm is formed between adjacent rods 25a and 25a having a diameter of 7 mm extending in parallel to each other in the vertical direction. The case where a screen having an open eye width of 5 mm is adopted will be described.

The screen 25 allows the water to be treated 22 to flow between the fluidized bed region 23 and the fixed bed region 24, while the fixed bed of the fluidized bed contact material 26 that flows in the fluidized bed region 23. It prevents the flow to the region 24. Therefore, the form is not limited to the form shown in FIG. 6, and if the contact material 26 for a fluidized bed has a mesh width of about 1/2 of the outer dimension, a plurality of rod-shaped bodies extending in the vertical direction as shown in FIG. 6 are used. The screen is not limited to the one configured, and may be a mesh-shaped screen.

In the present embodiment, even in the fluidized bed region 23, the entire surface aeration or swirling flow is generated by the aeration by the air diffuser 4, and the biofilm formed on the surface of the fluidized bed contact material 26 is efficiently treated with water. The processing capacity is improved by allowing 22 and MLSS to come into contact with each other.

Further, in the air diffuser 4 arranged from the upstream side to the downstream side at the bottom of the water tank 2 to be treated, the adjacent air diffusers 4a to 4f are used while one of them is performing the air diffuser operation. By controlling so as to stop, for example, as shown in FIG. 5, the air diffuser 4b arranged on the lower side of the screen 25 is stopped, and the upstream side and the downstream side adjacent to the air diffuser 4b are stopped. The air diffuser 4a and 4c arranged on the side can be made to perform the air diffuser operation. Alternatively, conversely, the air diffuser 4b arranged on the lower side of the screen 25 may perform the air diffuser operation, and the air diffuser 4a and 4c may be stopped. As a result, the flow of the water to be treated 22 through the screen 25 from the fluidized bed region 23 to the fixed bed region 24 or from the fixed bed region 24 to the fluidized bed region 23 is forcibly generated, and the screen 25 is clogged. Can be prevented more effectively.

Although not shown due to the size of the water tank 2 to be treated and the size of the air diffuser 4, the air diffuser is not installed on the lower side of the screen 25, and is upstream from the lower side of the screen 25. It is also conceivable that the air diffuser will be deployed on the side and the downstream side, respectively. Even in such a case, in the air diffuser 4 arranged in order from the upstream side to the downstream side at the bottom of the water tank 2 to be treated, one of the adjacent air diffusers 4a to 4f is air diffused. By controlling the other to stop during the operation, the fluidized bed region 23 to the fixed bed region 24 or the fixed bed region 24 to the fluidized bed region 23 of the water to be treated 22 via the screen 25 is controlled. The flow to the screen 25 is forcibly generated, and the clogging of the screen 25 is prevented more effectively.

Then, in the water purification treatment system 1 of the present embodiment, the contact material 26 for a fluidized bed having a larger specific surface area than the purification treatment unit 3 deployed in the fixed floor region 24 is used, and the water to be treated 22 having a large SS concentration is used. Is treated in the fluidized bed region 23 in a relatively short time, and the water to be treated 22 having a small soluble organic pollution concentration is treated by the purification treatment unit 3 in the fixed bed region 24 (in the illustrated example, it extends in the vertical direction). The treatment was performed by a purification treatment unit 3 composed of a honeycomb tube composed of a bundle of straight tubes).

As described above, in the fixed bed region 24, the flow is arranged in the upward direction as compared with the flow in the water to be treated 22 generated by the aeration by the air diffuser 4 in the fluidized bed region 23 described above. A purification treatment unit 3 having a shape, structure, and form capable of exerting a rectifying action is provided above the air diffuser 4. For example, in the illustrated embodiment, the rectifying action is generated by the purification processing unit 3 composed of a honeycomb tube composed of a bundle of straight tubes extending in the vertical direction.

Therefore, rectification in the fixed bed region 24 while effectively flowing the water to be treated 22 from the fluidized bed region 23 to the fixed bed region 24 or from the fixed bed region 24 to the fluidized bed region 23 via the screen 25. In the water purification treatment system 1 of the present embodiment, a predetermined space is provided between the purification treatment unit 3 of the fixed floor area 24 arranged adjacent to the screen 25 and the screen 25 in order to further enhance the effect of the above. ..

In the present embodiment, since the fixed floor region 24 is formed on the downstream side of the screen 25, among the honeycomb tubes constituting the purification treatment unit 3 in the fixed floor region 24, the honeycomb tube closest to the screen 25 and the screen 25 There is a predetermined interval between them.

In the present embodiment, the size of the distance between the purification treatment unit 3 of the fixed bed area 24 arranged adjacent to the screen 25 and the screen 25 is determined by the fluidized bed area 23 of the water to be treated 22 via the screen 25. It can be determined from the viewpoint of further enhancing the effect of rectification in the fixed bed region 24 while effectively performing the flow from the fixed bed region 24 or the fixed bed region 24 to the fluidized bed region 23. For example, it can be at least 30 cm or more.

[Purification treatment of water to be treated]
Next, the water purification treatment system of the second embodiment shown in FIG. 5, that is, a combined water purification treatment system of a fixed bed method and a fluidized bed method, which is a fusion of a fixed bed method and a fluidized bed method. An example of a case where water purification treatment is performed using a catalytic oxidation combination system will be described.

By operating the water to be treated circulation pump 5 (omitted in FIG. 5), the water to be treated 22 (raw water) to be treated is introduced into the water flow path 6 to be treated and flows into the fluidized bed region 23 of the water tank 2 to be treated.

The fluidized bed contact material 26 is charged into the fluidized bed region 23, and the air diffuser 4a and the air diffuser 4b are arranged in order from the upstream side to the downstream side at the bottom of the water tank 2 to be treated. When one performs the air dissipating operation, it is individually controlled so that the other stops, for example, an ascending flow indicated by an upward arrow in FIG. 5 is generated only at the position where the air dissipating device 4a is deployed. On the other hand, at the position where the air diffuser 4b is deployed, a downward flow indicated by a downward arrow is generated in FIG. As a result, the contact material 26 for the fluidized bed effectively flows into the water to be treated 22, and the water to be treated 22 and the soluble organic pollutant substance are formed on the biofilm formed on the surface of the contact material 26 for the fluidized bed. , SS, MLSS are more efficiently contacted and incorporated into the biofilm.

The water to be treated 22 that has flowed into the water tank 2 to be treated flows from the upstream side (left side in FIG. 5) to the downstream side (right side in FIG. 5) in the water tank 2 to be treated, and is treated and treated. It is discharged from the water tank 2.

At this time, the screen 25 provided between the fluidized bed area 23 and the fixed bed area 24 has a mesh width of about ½ of the outer dimensions of the fluidized bed contact material 26, and has a relatively large mesh width. Therefore, even when the SS concentration of the inflowing water to be treated 22 is high, the water to be treated 22 is viscous, the water to be treated 22 has a large load, or the like, the screen 25 itself has a biofilm. There is little risk of clogging due to adhesion and inhabitation.

Moreover, as described above, the air diffusers 4a to 4f arranged in order from the upstream side to the downstream side at the bottom of the water tank 2 to be treated are diffused by one of the adjacent air diffusers 4a to 4f. When the operation is performed, the other is individually controlled so as to stop, and a forced flow of the water to be treated 22 occurs between the fluidized floor region 23 and the fixed floor region 24, and the inflowing water to be treated 22 Even when the SS concentration is high, the water to be treated 22 is viscous, the water to be treated 22 is heavily loaded, etc., it is more certain that the biofilm adheres to and inhabits the screen 25 itself, causing clogging. Can be prevented.

The water to be treated 22 that has been purified in the fluidized bed region 23 passes through the screen 25 and flows into the fixed bed region 24. Here, as described above, the air diffuser 4 in which the air diffuser operation is performed is used. An ascending flow indicated by an upward arrow in FIG. 5 is generated inside each of the tubular portions 3a and 3a of the honeycomb tube at the deployed position, oxygen required for microorganisms is supplied, and SS and organic substances are discharged to the biological membrane. The inside of each of the tubular portions 3a and 3a of the honeycomb tube at the position where the air diffuser 4 is deployed, which is efficiently taken in and the air diffuser operation is stopped, is indicated by a downward arrow in FIG. A downward flow is generated, and excess sludge is appropriately peeled off.

In this way, after the treatment is performed in the fixed floor region 24, it is introduced into the filtered water flow path 8 by the operation of the filtration pump 7 (omitted in FIG. 5) and stored in the treated water tank.

The cleaning of the purification treatment unit 3 and the air diffuser 4 in the present embodiment is the same as the [cleaning treatment of the purification treatment unit] and the [cleaning treatment of the air diffuser] described in the first embodiment. Is omitted.

According to the water purification treatment system 1 of the second embodiment shown in FIG. 5, the water to be treated 22 having a high concentration of soluble organic pollution is first treated in the fluidized bed region 23 in a short time, and the soluble organic is organic. The water to be treated 22 having a low concentration of sexual pollution is treated in the fixed bed area 24, and the treatment of the fluidized bed method and the treatment of the fixed bed method are effectively combined to perform efficient and effective purification. Can be done. In addition, this makes it less susceptible to the effects of filamentous fungi.

Further, according to the water purification treatment system 1 of the second embodiment shown in FIG. 5, the effect described in the first embodiment can also be exhibited.

A fixed bed area 24 is arranged on the upstream side of the water tank 2 to be treated, a screen 25 is interposed, and a fluidized bed area is located downstream of the fixed bed area 24 in accordance with the properties of the water to be treated 22 to be purified. The form of arranging the 23, the form of arranging the fluidized bed area 23-screen 25-fixed bed area 24-screen 25-fluidized bed area 23 in order from upstream to downstream, the form of arranging the fluidized bed area 24-screen 25-fluidized bed. It is possible to make various changes such as the form of arranging the area 23-screen 25-fixed bed area 24.

As described above, the water purification treatment system of the second embodiment, that is, the contact oxidation combination which is a fusion of the fixed bed method and the fluidized bed method and is a combined water purification treatment system of the fixed bed method and the fluidized bed method. According to the system, not only the effect described in the first embodiment is exhibited, but also one existing treated water for purification treatment in which the water to be treated 22 flows from the upstream side to the downstream side. A fluidized bed region 23 and a fixed bed region 24 are provided adjacent to each other in the water tank 2 via a screen 25 for preventing the fluidized bed contact material 26 flowing in the fluidized bed region 23 from flowing to the fixed bed region 24. Thereby, the advantageous aspects of the fixed bed method and the fluidized bed method in the biological membrane treatment can be effectively exhibited. Moreover, this can be done by using one existing water tank 2 for purification treatment, which is advantageous in terms of cost.

(Embodiment 3)
FIG. 8 illustrates a schematic configuration of an example of a water purification treatment system by a full-scale split aeration method in which an aeration point in the water tank 2 to be treated is divided into several blocks and an aeration device is provided in each block.

In the embodiment shown in FIG. 8, the arrangement configuration of the air diffuser 4 in the water tank 2 to be treated and the connection configuration between the air supply pipe 13 and the air diffuser 4 are different from those of the first embodiment. The same reference numerals are given to the same configurations, and the description thereof will be omitted. Further, the treated water flow path 6, the filtered water flow path 8, the excess sludge discharge flow path 11, the treated water circulation pump 5, the filtration pump 7, the surplus sludge discharge pump 10, the chemical liquid pump 15, and the diluted water pump, which are common to the first embodiment. 18 is omitted in FIG.

In the water purification treatment system 1 of the present embodiment, the entire bottom surface of the water tank 2 to be treated is divided into a plurality of blocks, and an air diffuser 4 is provided in each block. In the embodiment shown in FIG. 8, the entire bottom surface of the water tank 2 to be treated is divided into 3 blocks, and an air diffuser 4g, 4h, and 4i are provided in each block. The air diffuser 4g, 4h, and 4i are unit air diffusers having a unit composed of a plurality of air diffusers 30.

A purification treatment unit 3 is installed above the air diffuser 4h. The air diffuser 4g, 4h, and 4i each aerate the water to be treated 22, but the air diffuser 4h also functions to aerate the purification treatment unit 3.

In the embodiment shown in FIG. 8, the air diffuser 4g and 4i are connected to the air supply tube 13b, and the compressed air supplied from the compressed air supply device 12b is the air supply tube 13b and the air diffuser 4g by the on-off valves 9q and 9r. It is introduced into 4i and aerates the water to be treated 22 via the air diffuser 4g and 4i. Further, the air supply tube 13a is bifurcated, one is connected to the air supply tube 13b and the other is connected to the air diffuser 4h. The compressed air supplied from the compressed air supply device 12a is introduced into the air supply tubes 13a, 13b, the air diffuser 4g, and 4h by the on-off valves 9o and 9p, and is purified by the water to be treated 22 via the air diffuser 4g and 4h. The processing unit 3 is aerated.

In the embodiment shown in FIG. 8, the diluted water flow path 19b is connected to the air supply tubes 13a and 13b, and the cleaning liquid flow path 20 is connected to the air supply tubes 13a and 13b.

[Purification treatment of water to be treated]
A case where the water purification treatment is performed using the water purification treatment system of the third embodiment shown in FIG. 8 will be described. The feature of the water purification treatment system 1 of the present embodiment is that the aeration points can be switched. Therefore, the control means including the computer common to the first embodiment controls the operation of the on-off valves 9o, 9p, 9q, 9r, and the compressed air supply devices 12a, 12b in cooperation with the timer and the sequencer.

For example, when the block on the left side of FIG. 8 of the water tank 2 to be treated is aerated, the control means individually controls the on-off valve 9q to the open state and the on-off valves 9o, 9p, 9r to the closed state for compression. Compressed air supplied from the air supply device 12b is introduced into the air supply pipe 13b and the air diffuser 4g, and the water to be treated 22 is aerated via the air diffuser 4g.

Further, for example, in FIG. 8 of the water tank 2 to be treated, when the central block is aerated, the control means individually controls the on-off valve 9o in the open state and the on-off valves 9p, 9q, 9r in the closed state. The compressed air supplied from the compressed air supply device 12a is introduced into the air supply pipe 13a and the air diffuser 4h, and the water to be treated 22 and the purification treatment unit 3 are aerated via the air diffuser 4h.

Further, for example, when the block on the right side in FIG. 8 of the water tank 2 to be treated is aerated, the control means individually controls the on-off valve 9r in the open state and the on-off valves 9o, 9p, 9q in the closed state. The compressed air supplied from the compressed air supply device 12b is introduced into the air supply pipe 13b and the air diffuser 4i, and the water to be treated 22 is aerated via the air diffuser 4i.

By continuously performing such control processing, it is possible to aerate the entire water to be treated 22 stored in the water tank 2 to be treated.

As described in the first embodiment, in the purification treatment unit 3, the water to be treated 22 is filtered and separated into activated sludge containing a pollutant and filtered water. By operating the filtration pump 7, the filtered water is introduced into the filtered water flow path 8 and stored in a filtered water tank (not shown). Further, due to the operation of the surplus sludge discharge pump 10, the activated sludge that has become surplus due to the biofilm treatment of the water to be treated 22 by the purification treatment unit 3 is introduced into the surplus sludge discharge passage 11 and discharged.

[Cleaning treatment of purification treatment unit]
An example of the cleaning treatment of the purification treatment unit by the water purification treatment system 1 of the present embodiment will be described with reference to FIGS. 3 and 8.

The control means controls the on-off valves 9a, 9d, 9h, 9p, 9q, 9r in the closed state and the on-off valves 9o, 9e to 9g in the open state, and also controls the compressed air supply device 12a, the chemical solution pump 15, and the diluted water pump. 18a is operated to stop the water circulation pump 5 to be treated, the filtration pump 7, the excess sludge discharge pump 10, the compressed air supply device 12b, and the diluting water pump 18b (see FIGS. 3 for opening / closing valves 9a and 9e and various pumps).

The compressed air supplied from the compressed air supply device 12a is introduced into the air supply pipe 13a and the air diffuser 4h, and the compressed air is sent to the purification processing unit 3 via the air diffuser 4h. Dirt is removed by the contact of compressed air with the film surface of the purification treatment unit 3.

By operating the chemical solution pump 15, the chemical solution is introduced from the chemical solution tank 14 into the chemical solution flow path 16 and supplied to the mixer 21. Further, by operating the diluted water pump 18a, the diluted water is introduced from the diluted water tank 17 into the diluted water flow path 19a and supplied to the mixer 21.

The chemical solution and the diluted water supplied to the mixer 21 are mixed to generate a washing solution. This cleaning liquid is introduced into the cleaning liquid flow path 20 and the filtered water flow path 8 on the opening / closing valve 9e side, and is supplied to the purification processing unit 3. The purification treatment unit 3 is washed with the supplied cleaning liquid (see FIG. 3 for the filtered water flow path 8).

[Cleaning process of air diffuser]
An example of the cleaning treatment of the air diffuser 4 by the water purification treatment system 1 of the present embodiment will be described with reference to FIGS. 4 and 8.

The control means controls the on-off valves 9a, 9e, 9h to the closed state and the on-off valves 9d, 9f, 9g, 9o to 9r to the open state, and operates the chemical liquid pump 15 and the diluting water pump 18a to circulate the water to be treated. Stop the pump 5, the filtration pump 7, the excess sludge discharge pump 10, the compressed air supply devices 12a and 12b, and the diluting water pump 18b (see FIGS. 4 for the on-off valves 9a and 9e and various pumps).

By operating the chemical solution pump 15, the chemical solution is introduced from the chemical solution tank 14 into the chemical solution flow path 16 and supplied to the mixer 21. Further, by operating the diluted water pump 18a, the diluted water is introduced from the diluted water tank 17 into the diluted water flow path 19a and supplied to the mixer 21.

The chemical solution and the diluted water supplied to the mixer 21 are mixed to generate a washing solution. This cleaning liquid is introduced into the cleaning liquid flow path 20 and the air supply pipes 13a and 13b on the opening / closing valve 9d side, and is supplied to the air diffuser 4g to 4i. The air diffuser 4g to 4i is washed with the supplied washing liquid.

Next, the control means controls the on-off valves 9a and 9d to 9g in the closed state and the on-off valves 9h and 9o to 9r in the open state, operates the diluting water pump 18b, and operates the water circulation pump 5 to be treated and the filtering pump. 7. The surplus sludge discharge pump 10, the compressed air supply devices 12a and 12b, the chemical liquid pump 15, and the diluting water pump 18a are stopped.

By operating the diluted water pump 18b, the diluted water is introduced from the diluted water tank 17 into the diluted water flow path 19b and the air supply pipes 13a and 13b, and is supplied to the air diffuser 4g to 4i. The chemical solution remaining in the air diffuser 4g to 4i is removed by the supplied diluted solution.

As described above, in the water purification treatment system 1 of the third embodiment shown in FIG. 8, the entire bottom surface of the water tank 2 to be treated is divided into a plurality of blocks, and an aeration device 4 is provided in each block. It is a system that individually switches the aeration by the air diffuser 4. By individually controlling the air diffuser 4 in each block, the water to be treated 22 in the water tank 2 to be treated can be effectively aerated with a small flow rate of compressed air.

In the water purification treatment system by the conventional membrane separation active sludge method, a dead space is formed in the treatment tank only by aerating the hollow fiber membrane when cleaning the hollow fiber membrane, and the space becomes an anaerobic part. Aeration with a blower will be performed separately for this anaerobic part, but the power cost will increase. According to the water purification treatment system 1 of the third embodiment, the entire bottom surface of the water tank 2 to be treated is divided into a plurality of blocks, and an air diffuser 4 is provided in each block, and aeration by the air diffuser 4 in each block is provided. By switching the above individually, the entire water tank 2 to be treated is aerated at the same power cost, and the formation of the dead space can be suppressed.

Further, by individually controlling the on-off valve 9 in each block, an ascending flow is generated in the block in which the on-off valve 9 is "open", and a down-flow is generated in the block in which the on-off valve 9 is "closed". By controlling such an operation by the control means, turbulent diffusion occurs in the water tank 2 to be treated, and a short path caused by the rotation of the water 22 to be treated can be suppressed.

Further, according to the water purification treatment system 1 of the third embodiment shown in FIG. 8, the effect described in the first embodiment can also be exhibited.

(Embodiment 4)
FIG. 9 illustrates an example of the configuration of the air diffuser 4 included in the water purification treatment system 1 of the above-described first to third embodiments.

In the embodiment shown in FIG. 9, a plurality of air diffusers 4 as unit air diffusers 27 having a plurality of air diffusers 30 as one unit are arranged in the water tank 2 to be treated. Each air diffuser 4 is communicated with the compressed air supply device 12 by an air supply pipe 13. Further, as shown in FIG. 9A, each air diffuser 4 is installed at a depth H in the water tank 2 to be treated.

Each diffuser pipe 30 is provided with a plurality of pores 31 for discharging compressed air supplied from the compressed air supply device 12. In the present embodiment, as shown in FIG. 9B, the pores 31 opened downward are formed in the air diffuser 30.

Further, both ends of each air diffuser 30 are open or provided with openings. In the present embodiment, as shown in FIG. 9B, the end portion 32 of the air diffuser pipe 30 is formed so as to bend in a direction orthogonal to the air diffuser pipe 30, and becomes an end opening 33 that opens downward. There is. As a result, the position of the pores 31 provided in the air diffuser 30 is higher than the position of the end opening 33 at the end 32 by h.

Each air supply pipe 13 includes a first on-off valve 28 and a second on-off valve 29. The opening and closing of these on-off valves is controlled by the control means described in the first to third embodiments.

In the [purification process of water to be treated] described in the first embodiment, the control means controls the first on-off valves 28a, 28b, 28c to be in the open state and the second on-off valves 29a, 29b, 29c to be in the closed state. At this time, compressed air corresponding to the water pressure at the depth H is supplied from the compressed air supply device 12 to each air diffuser 4 via the air supply pipe 13, and is discharged from the pores 31 to aerate the water to be treated 22. , Or supply compressed air to the purification treatment unit 3.

Next, the control means controls the first open / close valve 28a to be in the closed state. At this time, the inside of the air diffuser 4 and the air supply pipe 13 on the side where the first opening / closing valve 28a is deployed is filled with compressed air related to the water pressure at the depth H.

Next, the control means controls the second on-off valve 29a to be in the open state. The compressed air filled (residual) inside the air diffuser 4 and the air supply pipe 13 on the side where the first on-off valve 28a is deployed is discharged to the outside air. At the same time, as shown in FIG. 10A, the water to be treated 22 infiltrates through the pore 31 and the end opening 33.

Next, the control means controls the first on-off valves 28b and 28c to be in the closed state and the first on-off valve 28a to be in the open state. At this time, compressed air corresponding to the water pressure at the depth H is supplied from the compressed air supply device 12 to the air diffuser 4 on the side where the first on-off valve 28a is deployed via the air supply pipe 13. The water to be treated 22 that has entered the air diffuser 4 in the form of being extruded is discharged from the end opening 33 as shown in FIG. 10 (b). Further, the compressed air is discharged from the pores 31 to aerate the water to be treated 22, or is sent to the purification treatment unit 3. Further, when the water to be treated 22 that has entered the air diffuser 4 is discharged from the end opening 33, foreign matter in the air diffuser 4 is also discharged from the end opening 33 as shown in FIG. 10 (b). Will be done.

As described above, in the water purification treatment system 1 of the fourth embodiment shown in FIGS. 9 and 10, the position of the pore 31 provided in the air diffuser 30 is larger than the position of the end opening 33 in the end portion 32. By adopting the air diffuser 4 which is higher by h and the control means controls the opening and closing of the first opening / closing valve 28 and the second opening / closing valve 29, the plurality of pores 31 included in each air diffuser 4 are connected to each other. It prevents the air diffuser 4 from being blocked due to the phenomenon of discharge and suction of compressed air. That is, the first on-off valve 28 and the second on-off valve 29 function as opening means for discharging the compressed air or the water to be treated 22 remaining in the air diffuser 4 to the outside of the air diffuser 4.

Therefore, according to the water purification treatment system 1 of the fourth embodiment shown in FIGS. 9 and 10, the effect of preventing the air diffuser 4 from being blocked can also be exhibited. In addition, the air diffuser 4 installed in the water tank 2 to be treated can be pulled up and maintained without draining water.

Further, according to the water purification treatment system 1 of the fourth embodiment shown in FIGS. 9 and 10, the effects described in the first to third embodiments can be exhibited.

Although preferred embodiments and examples of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to such embodiments and examples, and the technical scope can be grasped from the description of the scope of claims. Can be changed to various forms in.

For example, in the air diffuser 4 according to the above-described first to fourth embodiments, the pores provided in the air diffuser 30 are made into openings having a size for discharging bubbles of less than 100 μm, and are conventionally known to generate fine bubbles. It can be an air diffuser.

Further, regarding the air diffuser 4 in the above-described embodiments 1 to 4, when the compressed air is discharged, the water to be treated 22 around the air diffuser 30 is taken into the inside of the air diffuser 30 and the water to be treated is taken in. It can be a conventionally known air diffuser provided with a mixing means for mixing 22 and compressed air.

1 Water purification treatment system 2 Processed water tank 3 Purification treatment unit 4 Air diffuser 5 Processed water circulation pump 6 Processed water flow path 7 Filtering pump 8 Filtered water flow path 9 Open / close valve 10 Surplus sludge discharge pump 11 Surplus sludge discharge channel 12 Compressed air Supply device 13 Air supply pipe 14 Chemical solution tank 15 Chemical solution pump 16 Chemical solution flow path 17 Diluted water tank 18 Diluted water pump 19 Diluted water flow path 20 Cleaning liquid flow path 21 Mixer 22 Processed water 23 Flow bed area 24 Fixed floor area 25 Screen 26 Flow bed Contact material 27 Unit air diffuser means 28 1st open / close valve 29 2nd open / close valve 30 Air diffuser 31 Pore 32 End 33 End opening

Claims (10)

A purification treatment unit installed in the water tank to be treated to purify the water to be treated, and an aeration device installed in the water tank to be treated to aerate the water to be treated stored in the water tank to be treated. It is a water purification treatment system that is equipped.
The purification treatment unit is communicated with a cleaning liquid tank for supplying a cleaning liquid for cleaning the purification treatment unit and the air diffuser by a cleaning liquid flow path.
The air diffuser is communicated with the compressed air supply device by an air supply pipe, and is also communicated with the cleaning liquid tank by a cleaning liquid flow path .
A control means for controlling switching between the supply of compressed air from the compressed air supply device to the air diffuser and the supply of the cleaning liquid from the cleaning liquid tank to the purification treatment unit and the air diffuser is provided .
The control means is
At the time of cleaning the purification treatment unit, the cleaning liquid is supplied from the cleaning liquid tank to the purification treatment unit and the compressed air is supplied from the compressed air supply device to the air diffuser at the same time.
A water purification treatment system characterized by this. The air diffuser is a unit air diffuser having a plurality of air diffusers as one unit.
The water purification treatment system according to claim 1, wherein the control means individually controls switching of supply of compressed air from the compressed air supply device to each diffuser pipe. The air diffuser is provided with pores for discharging the compressed air.
The end of the air diffuser is open and
The end is formed so that the position where the pores are provided is higher than the position of the opening at the end.
The air supply tube includes an opening means for discharging the compressed air remaining in the air diffuser tube to the outside.
The second aspect of claim 2, wherein the control means controls switching between supply of compressed air from the compressed air supply device to the diffuser pipe and discharge of compressed air remaining in the diffuser pipe to the outside. Water purification treatment system. The water purification treatment system according to claim 3, wherein the pores have openings that generate bubbles of less than 100 μm. The water purification treatment according to claim 3, further comprising a mixing means for taking the water to be treated around the air diffuser into the air diffuser and mixing the taken-in water to be treated with the compressed air. system. In the water tank to be treated, a fluidized bed region in which a plurality of contact materials for fluidized beds flow in the water to be treated and purification treatment is performed by the fluidized bed method, and a purification treatment unit is installed to purify by the fixed bed method. Deployed adjacent to the fixed bed area where the treatment takes place,
A screen is installed at the boundary between the fluidized bed area and the fixed bed area.
The water according to any one of claims 1 to 5, wherein a predetermined space is provided between the purification treatment unit in the fixed floor area arranged adjacent to the screen and the screen. Purification treatment system. The purification treatment unit has the shape of a honeycomb tube composed of a bundle of straight tubes extending in the vertical direction.
The water purification treatment system according to any one of claims 1 to 5 , wherein the water purification treatment system is characterized by the above. The water purification treatment system according to any one of claims 1 to 5 , wherein the purification treatment unit is a membrane member that filters pollutants from the water to be treated. The fixed floor area was composed of a purification treatment unit having the shape of a honeycomb tube composed of a bundle of straight pipes extending in the vertical direction.
The water purification treatment system according to claim 6. The purification treatment unit constituting the fixed floor region is a membrane member that filters pollutants from the water to be treated.
The water purification treatment system according to claim 6.

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