KR101503887B1 - High degree and energy reduction type process system of wasted water using membrane tank - Google Patents

Abstract

The present invention is characterized in that the wastewater supplied from the bottom and the wastewater collecting tank through the transfer pump and containing the sludge component is treated first in the aeration tank and then introduced into the membrane separation tank immersed in the hollow fiber membrane module, The present invention relates to a wastewater treatment system for supplying final treated water through a hollow fiber membrane to a treated water tank by using a suction pump and collecting sludge components settled to the bottom of a membrane separation tank to a sludge storage tank, The sludge component settled to the bottom of the tank is transferred to a sludge storage tank through a natural dropping type transfer method by water pressure and self weight. An overflow pipe extending to the water collecting tank is installed on the upper side of the membrane separation tank. A water level control pipe is connected to a position corresponding to the height of the module, and the water level control pipe is connected to the water collecting tank So that the number of pumps used is minimized to reduce the energy and operation cost and to separate and supply the sludge component and filtrate component from the membrane separation tank to the sludge storage tank and the collection tank to reduce the processing load and the processing time of the sludge as much as possible And the water level of the membrane separation tank is lowered to the position corresponding to the height of the hollow fiber membrane module during the washing or replacement operation of the hollow fiber membrane module to prevent the waste of the cleaning agent and the washing liquid and the cleaning and replacement work of the hollow fiber membrane module The present invention relates to an energy saving type wastewater treatment system using a membrane separation tank.

Description

TECHNICAL FIELD [0001] The present invention relates to an energy saving type wastewater treatment system using a membrane separation tank,

The present invention is characterized in that the wastewater supplied from the bottom and the wastewater collecting tank through the transfer pump and containing the sludge component is treated first in the aeration tank and then introduced into the membrane separation tank immersed in the hollow fiber membrane module, The present invention relates to a wastewater treatment system using a membrane separation tank for supplying final treated water through a hollow fiber membrane to a treated water tank by using a suction pump and sending collected sludge components to a bottom of a membrane separation tank to a sludge storage tank.

In general, sewage and wastewater discharged from homes and factories contain a large amount of organic matter as well as various harmful substances. When discharged into rivers or coastal waters without any treatment, they cause severe environmental pollution, And sewage and wastewater treatment plants. In accordance with stricter environmental regulations, factories and workplaces that discharge sewage and wastewater above the standard level are required to have separate small-scale treatment facilities.

As described above, the method of removing organic substances and harmful components contained in sewage and wastewater can be broadly divided into physical treatment methods, chemical treatment methods, and biological treatment methods. Among them, There is a disadvantage that the volume of the chemical is large and the equipment is expensive. The chemical treatment method requires a large amount of expensive chemicals, which is not preferable from the economical point of view and a disadvantage that the second pollutant is generated due to the use of the chemical have.

On the contrary, the biological treatment method is advantageous in terms of economy compared with other methods, and has an advantage that the operation of the system is easy and secondary pollutants are not generated. Therefore, recently, biological treatment using activated sludge A wastewater treatment system is widely used in which a physical filtration treatment using a hollow fiber membrane is performed in parallel with the removal of organic matter, nitrogen and phosphorus components.

1, the conventional wastewater treatment system includes a water collecting tank 2 through which an inflow water flows into an inflow pipe 2a, a transfer pump 8 installed inside the water collecting tank 2, An aeration tank 3 for supplying wastewater containing a sludge component via a transfer pipe 8a of the transfer pump 8 and a membrane separation tank 3 for receiving the primary treatment water treated in the aeration tank 3 A feed pump 8 and a hollow fiber membrane module 5 installed in the membrane separation tank 4 and a suction pump 10 through the hollow fiber membrane module 5, And a sludge storage tank 7 for storing and collecting the sludge components discharged from the transfer pump 8 of the membrane separation tank 4 through the transfer pipe 8a.

A bubble dispersing unit 9b is installed inside the water collecting tank 2 and the aeration tank 3 and each of the bubble dispersing units 9b and the hollow fiber membrane module 5 is connected to an air injection line 9a through a blower The drain pipe 3b and the drain pipe 4b extending to the water collecting tank 2 are connected to the bottom of the aeration tank 3 and the membrane separation tank 4, And a return pipe 7b extending to the water collecting tank 2 is also connected to the upper side of the sludge storage tank 7.

On the other hand, each check valve CV and a valve opening / closing valve mechanism V are provided in each of the conveyance pipes 8a. The blower 9 is shown as two in the figure, And the remaining one blower 9 is used for both the aeration operation of the aeration tank 3 and the cleaning operation of the hollow fiber membrane module 5 and the air injection line 9a for the water collecting tank 2 is used, A check valve CV is provided and an air injection line 9a for the aeration tank 3 and an air injection line 9a for washing the hollow fiber membrane module 5 are provided with a check valve CV from the blower 9 Is branched into two lines each having a valve mechanism (V).

In addition, the suction pump 10 is connected to the hollow fiber membrane module 5 by a suction pipe 10a having a valve mechanism V and a buffering connection hose 11, The water tank 10b is extended to the treatment water tank 6 with the valve mechanism V and the flow rate meter 10c and the water tank space is provided between the aeration tank 3 and the membrane separation tank 4 And an overflow passage 3a is provided on an upper end side of the partition wall 4a and a discharge pipe 6a of final treated water is connected to the treatment water tank 6. [ And a sludge discharge pipe 7a having a valve mechanism V is connected to the lower end of the sludge storage tank 7 for collecting excess sludge components.

The conventional wastewater treatment system 1 described above induces nitrification by aerobic microorganisms and release of phosphorus and decomposition of organic matter in the aeration tank 2 and the aeration tank 3 which are provided with favorable conditions The denitrification reaction is induced in the membrane separation tank 4 provided with the anaerobic condition and the sludge and the treated water are subjected to solid-liquid separation through the hollow fiber membrane module 5, Thereby enabling advanced processing.

Nitrification: Nitrosomonas and Nitrobacter, which are aerobic nitrifying microorganisms, are used to oxidize ammonia nitrogen, which is highly toxic, through nitrite to nitric acid. (1) and (2).

^{_{(1) NH 4 + + 1.5O}} 2 → NO 2 - + H 2 O + H + + energy

(2) NO ₂ ^- + 0.5O ₂ → NO ₃ ^- + energy

The above equations (1) and (2) summarize the equation (3), and the energy generated in each reaction is used for cell synthesis and maintenance of aerobic microorganisms.

NH ₄ ⁺ + 2O ₂ → NO ₃ ^- + 2H ⁺ + H ₂ O + energy ---------------------- (3)

Note) Denitrification reaction: When microorganisms decompose organic matter or organic residues, nitrate nitrogen is used instead of oxygen and nitrate nitrogen is reduced to nitrogen gas. The reaction formula is as follows (5) and same.

^{_{(5) 6NO 3 - + 5CH}} 3 OH → 3N 2 + 5CO 2 + 7H 2 O + 6OH -

(6) NO ₂ ^- + 1.08 CH ₃ OH + 0.24H ₂ CO _{3 -} > 0.056C ₅ H ₉ NO ₂ + 0.47N ₂ + 1.68H ₂ O + HCO ₃ ^-

In addition, even if the sludge has poor gravity sedimentation property in the membrane separation tank 4, since the microorganism itself can not pass through the hollow fiber membrane, a certain treated water quality can be ensured and the microorganism concentration can be maintained at a high concentration, It is possible to perform stable treatment in spite of various properties changes of the water quality and also to perform the cleaning operation of the hollow fiber membrane by scrubbing by the bubbles easily. As a result of these advantages, And it is more widely applied to small-scale processing facilities installed and operated.

However, in the conventional wastewater treatment system 1 as described above, the excess sludge settled on the bottom side of the membrane separation tank 4 is supplied to the sludge storage tank 7 by the forced transfer method using the transfer pump 8 A total of three pumps including the transfer pump 8 and the suction pump 10 of the water collecting tank 2 are operated to waste unnecessary energy and increase the operation cost. The sludge component pumped from the bottom of the sludge storage tank 7 is disturbed by the high pressure through the sludge storage tank 7 together with the filtrate to increase the sludge processing load and processing time Factor.

In addition, when a large amount of air bubbles are introduced into the membrane separation tank 4 during scrubbing operation for cleaning the hollow fiber membrane, dissolved oxygen is increased. In the membrane separation tank 4 performing denitrification under anaerobic conditions A part of the filtrate stored in the membrane separation tank 4 is discharged to the water collecting tank 2 under aerobic conditions and the treated water subjected to the nitrification reaction is introduced into the water collecting tank 2 and the aeration tank 3, It is preferable to introduce the filtrate into the separating tank 4. However, in the conventional case, such a filtrate can not be rationally distributed.

Of course, a part of the filtrate can be supplied to the sludge storage tank 7 and the water collecting tank 2 by using the transfer pump 8 and the drain pipe 4b provided in the membrane separation tank 4, And the drain pipe 4b are mainly used for discharging excess sludge and the amount of the filtrate discharged through them is relatively small so that the filtrate stored in the membrane separation tank 4 is sent to the collection tank 2 with a relatively large amount Which in turn leads to a situation where the sludge component, which provides the foundation of the microbial culture, is unnecessarily drained.

On the other hand, since the scrubbing operation for cleaning the hollow fiber membrane is performed in a state where a large amount of treated water is stored in the membrane separation tank 4, much power is also consumed for operating the blower 9, , And even when the cleaning agent is supplied into the membrane separation tank 4 or the cleaning solution is supplied so as to improve the cleaning performance of the hollow fiber membrane, There is a problem in that a washing chemical or a washing liquid must be input. Also, in the replacing operation of the hollow fiber membrane module 5, the operation of connecting the hollow fiber membrane module 5 located below the water surface of the treated water to a crane or the like is also very difficult.

The level of the membrane separation tank 4 may be lowered by using the transfer pump 8 or the drain piping 4b as described above. However, by the transfer pump 8 or the drain piping 4b, It is difficult to quickly and accurately adjust the water level most appropriate for the cleaning operation and the replacement operation of the hollow fiber membrane module 5, that is, the water level corresponding to the height of the uppermost end of the hollow fiber membrane module 5, The problem that the sludge component is discharged in an unnecessarily large amount was also caused.

Korean Patent Publication No. 10-1999-0037581 Korean Patent Publication No. 10-2002-0065963

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a sludge storage tank, By installing an overflow pipe extending to the sump tank, it is possible to minimize the number of pumps used to reduce energy and running costs, and to ensure that the surplus sludge components and filtrate excess from the membrane separation tank are separately supplied to the sludge storage tank and the sump tank Thereby reducing the processing load and the processing time of the sludge as much as possible.

In addition, a water level control tube is connected to the membrane separating tank at a position corresponding to the height of the hollow fiber membrane module, and the water level control tube is connected to the water collecting tank, so that when the hollow fiber membrane module is cleaned or replaced, The water level is accurately lowered to a position corresponding to the height of the hollow fiber membrane module to prevent the waste of the cleaning agent and the cleaning liquid and the cleaning and replacement work of the hollow fiber membrane module can be performed more quickly and easily, It is a second technical object to enable the operation of distributing the filtrate through the collecting tank when the dissolved oxygen of the filtrate stored in the membrane separation tank is increased by using the regulating tube.

On the other hand, when the water level of the membrane separation tank reaches the level required for the cleaning operation of the hollow fiber membrane module, the sensor mechanism senses the operation to close the valve mechanism of the water level control tube, And air can be automatically carried out. The third object of the present invention is to provide an economical and rational method which can be applied optimally to a small-scale processing facility which is installed and operated individually for each factory or workplace The main technical challenge is to provide an energy-saving wastewater advanced treatment system.

According to an aspect of the present invention, there is provided an aeration tank including a collection tank into which waste water flows and a sludge component containing a sludge component through a transfer pump installed in the collection tank, A membrane separation tank into which the treated primary treatment water flows, a hollow fiber membrane module inserted and installed in the membrane separation tank by immersion, a treatment water tank through which the final treated water flows from the hollow fiber membrane module through a suction pump, And a sludge storage tank for storing and collecting the sludge components discharged from the sludge tank, wherein a bubble dispersing unit is installed in the aeration tank or the aeration tank and the aeration tank, and the bubble dispersing unit and the hollow fiber membrane module are connected to the blower And an overflow pipe extending to the water collecting tank is connected to the upper portion of the membrane separation tank. And a drain pipe extending to the water collecting tank is connected to the bottom of the aeration tank and the membrane separation tank in a state of having a valve mechanism and a return pipe extending to the water collecting tank is connected to the upper side of the sludge storage tank. Wherein the sludge storage tank is disposed at a lower position than the membrane separation tank and a sludge transfer pipe for transferring the sedimented sludge component to the sludge storage tank by hydraulic pressure and self weight is connected to the bottom of the membrane separation tank, A valve mechanism is installed in the membrane separation tank, and a water level control pipe having a valve mechanism is connected to a position corresponding to the height of the hollow fiber membrane module, and the water level control pipe is connected to an overflow pipe, The tube itself is extended to the water collecting tank, and the suction pump is bi- Wherein the suction pipe of the suction pump is connected to the hollow fiber membrane module in a state that the suction pipe of the suction pump is provided with a valve mechanism and the discharge pipe of the suction pump is extended to the treatment water tank with the valve mechanism, The suction pipe or the discharge pipe is connected to a cleaning liquid supply pipe of the cleaning liquid tank at a previous position of the valve mechanism, and a valve mechanism is installed in the cleaning liquid supply pipe.

In addition, the valve mechanism installed in the level control pipe and the cleaning liquid supply pipe becomes a solenoid valve, and the opening and closing operation of each of the solenoid valves, the operation of the suction pump, and the air supply to the hollow fiber membrane module by the blower, And a sludge collecting unit is formed on the bottom side of the membrane separation tank, and the sludge conveying pipe is connected to the lower end vertex portion of the sludge collecting unit Is installed.

According to the present invention as described above, the excess sludge component precipitated on the bottom side of the membrane separation tank is supplied to the sludge storage tank by a natural dropping method, and an excessive amount of the filtrate stored in the membrane separation tank is overflowed to the collection tank, The present invention provides a sludge storage tank which is capable of reducing energy and operation costs and is capable of discharging only excess sludge components from a membrane separation tank through a sludge storage tank at a low pressure, It is possible to reduce the sludge treatment load and treatment time in the sludge storage as much as possible.

In addition, the level of the filtrate stored in the membrane separation tank can be quickly and accurately lowered to the height of the hollow fiber membrane module by opening the water level control pipe during the cleaning operation of the hollow fiber membrane module, thereby minimizing the power consumed in operating the blower for bubble scrubbing Not only can the effect of contributing to the reduction of energy and operation cost be provided, but also the concentration condition necessary for the cleaning operation can be met even if a small amount of cleaning agent or cleaning liquid is injected into the membrane separation tank, It is possible to perform the washing operation more quickly and easily while preventing the waste of the washing liquid. By making the upper end of the hollow fiber membrane module coaxial with the water surface of the filtrate, the hollow fiber membrane module can be connected to the crane Replacing desert modules is also a quick and easy way to do it Provided.

In addition, when a large amount of bubbles are introduced in the scrubbing process for cleaning the hollow fiber membrane module, when the dissolved oxygen in the filtrate is increased, a portion of the filtrate in the membrane separation tank is discharged to the collection tank by using an overflow pipe or a water level control pipe The present invention also provides a filtration system for a membrane separation apparatus, comprising: a membrane separation tank for separating the treated water into a membrane separation tank and an anaerobic tank; The water collection tank and the aeration tank under the condition induce the nitrification reaction by the dissolved oxygen in the filtrate supplied from the membrane separation tank, thereby providing a more stable and efficient treatment of waste water and wastewater.

As an additional matter, immediately after the level of water level of the membrane separation tank reaches the level required for cleaning the hollow fiber membrane module, the level sensor in the flow meter of the water level control tube or the membrane separation tank senses this and the solenoid valve So that the cleaning liquid is supplied to the hollow fiber membrane module by reverse operation of the suction pump and the air is supplied to the hollow fiber membrane module by the blower so that the cleaning operation of the hollow fiber membrane module is automatically , And each of these useful advantages provides an economical and rational method of energy-saving wastewater treatment system that can be optimally applied to small-scale processing facilities that are individually installed and operated in factories or business sites. .

1 is a piping diagram showing a wastewater treatment system using a conventional membrane separation tank.
2 is a piping diagram showing an energy saving type wastewater treatment system using a membrane separation tank according to the present invention.
3 is a side view of the hollow fiber membrane module used in the present invention.
4 is a front sectional view of Fig. 3; Fig.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 2, the energy saving type wastewater treatment system using the membrane separation tank according to the present invention includes a water collection tank 2 through which waste water flows into the water collection tank 2 through an inlet pipe 2a, An aeration tank 3 supplied with a sludge component containing a sludge component via a transfer pipe 8 installed in the aeration tank 8 and a transfer pipe 8a of the transfer pump 8, A membrane separation tank 4 into which the primary treatment water flows, a hollow fiber membrane module 5 inserted and immersed in the membrane separation tank 4, And a sludge storage tank 7 for storing and collecting surplus sludge components discharged from the membrane separation tank 4. The sludge storage tank 7 is connected to the sludge storage tank 7 via a suction pump 10, The essential components are in line with conventional systems.

A bubble dispersing unit 9b is installed inside the water collecting tank 2 and the aeration tank 3 and each of the bubble dispersing units 9b and the hollow fiber membrane module 5 is connected to an air injection line 9a through a blower The drain pipe 3b and the drain pipe 4b extending to the water collecting tank 2 are connected to the bottom of the aeration tank 3 and the membrane separation tank 4, And a check valve CV for reverse flow shutoff and a valve mechanism V for opening and closing the pipe are provided in the transfer pipe 8a of the transfer pump 8, respectively.

In addition, the suction pump 10 is connected to the hollow fiber membrane module 5 by a suction pipe 10a having a valve mechanism V and a buffering connection hose 11, The water tank 10b is extended to the treatment water tank 6 with the valve mechanism V and the flow rate meter 10c and the water tank space is provided between the aeration tank 3 and the membrane separation tank 4 And an overflow passage 3a is provided on an upper end side of the partition wall 4a and a discharge pipe 6a of final treated water is connected to the treatment water tank 6. [ And a sludge discharge pipe 7a having a valve mechanism V is connected to the lower end of the sludge storage tank 7 for collecting excess sludge components.

As a component of the first essential part of the present invention, the sludge storage tank 7 is disposed at a lower position than the membrane separation tank 4, and the sedimented sludge component And an overflow pipe 13 extending to the water collecting tank 2 is connected to the upper portion of the membrane separation tank 4. The overflow pipe 13 is connected to the sludge storage tank 7 through a sludge storage tank 7, A valve mechanism V is installed in the sludge transport line 12 and an overflow return pipe 7b extending to the collection tank 2 is connected to the upper side of the sludge storage tank 7.

The sludge storage tank 7 is disposed at a position higher than the collection tank 2 and the aeration tank 3 and the membrane separation tank 4 are disposed at a position higher than the sludge storage tank 7, Shaped sludge collecting portion 12a is formed on the bottom side of the membrane separation tank 4 and the sludge transport pipe 12 is connected to the lower end vertex portion of the sludge collecting portion 12a Is more preferable than the natural dropping method of sludge by hydraulic pressure and self weight.

It is also possible to construct the overflow pipe 13 and the drain pipe 3b of the aeration tank 3 and the drain pipe 4b of the membrane separation tank 4 as individual piping lines to extend to the water collecting tank 2 side However, as shown in FIG. 2, it is necessary to finally integrate the overflow pipe 13 and the drain pipes 3b and 4b into one pipe line, and then extend the overflow pipe 13 and the drain pipes 3b and 4b toward the water collecting tank 2, It is advantageous.

When the sludge transport pipe 12 and the overflow pipe 13 are applied in the above-described manner, the excess sludge component precipitated on the bottom side of the membrane separation tank 4 is supplied to the sludge storage tank 7 by a natural dropping method And the excess amount of the filtrate stored in the membrane separation tank 4 overflows to the water collecting tank 2 to minimize the number of the pumps used and to reduce energy and operation cost. 7, the sludge processing load in the sludge storage tank 7 and the treatment time in the sludge storage tank 7 in a state of not disturbing the sludge component precipitated on the bottom side of the sludge storage tank 7, Can be minimized.

The water level control tube 14 having the valve mechanism V is disposed on the membrane separation tank 4 in correspondence with the height of the hollow fiber membrane module 5 as the second essential part of the present invention The water level control pipe 14 may be connected to the overflow pipe 13 and the water level control pipe 14 itself may form a pipe line extending to the water collecting tank 2.

When the water level control tube 14 is installed in the manner described above, the water level control tube 14 is opened during the cleaning operation or the replacement operation of the hollow fiber membrane module 5, so that unnecessary discharge of the sludge providing the culture base of the microorganism The water level of the filtrate stored in the membrane separation tank 4 can be quickly and accurately lowered to the height of the hollow fiber membrane module 5 shown in phantom in FIG. 2, whereby the hollow fiber membrane module 5, Since the cleaning operation of the blower 9 can be performed under a water pressure condition much lower than that in the conventional case, the power consumed in the operation of the blower 9 can be minimized, further contributing to reduction of energy and operation cost.

In addition, even when a small amount of cleaning agent or cleaning liquid is introduced into the membrane separation tank 4, concentration conditions necessary for the cleaning operation can be met, so that waste of the cleaning agent and the cleaning liquid can be prevented and the hollow fiber membrane module 5 And the upper end side of the hollow fiber membrane module 5 is located on the same line as the water surface of the filtrate so that the hollow fiber membrane module 5 is connected to a crane or the like, (5) can be performed more quickly and easily.

Particularly, when a large amount of bubbles are introduced in the scrubbing process for cleaning the hollow fiber membrane module 5, when the dissolved oxygen in the filtrate stored in the membrane separation tank 4 is increased, the overflow pipe 13, A portion of the filtrate in the membrane separation tank 4 is discharged to the collection tank 2 using the pipe 14 and the treated water subjected to the nitrification reaction in the collection tank 2 and the aeration tank 3 is introduced into the membrane separation tank 4 It is possible to distribute the filtrate in a reasonable manner.

This makes it possible to sufficiently maintain the function of the membrane separation tank 4 mainly performing the denitrification reaction under the anaerobic condition and to maintain the function of the membrane separation tank 4 supplied from the membrane separation tank 4 in the water collection tank 2 and the aeration tank 3 under aerobic conditions The nitrification reaction can be induced by using the dissolved oxygen in the filtrate, so that the wastewater treatment can be performed more stably and efficiently than in the conventional case.

As the third essential part of the present invention, the suction pump 10 is installed as a pump capable of bidirectional driving so that not only the discharge of the final treated water through the hollow fiber membrane module 5 but also the discharge of the hollow fiber membrane module 5, The cleaning liquid supply pipe 16 of the cleaning liquid tank 15 is connected to the suction pipe 10a or the discharge pipe 10b of the suction pump 10 at a previous position of the valve mechanism V The cleaning liquid supply pipe 16 is connected to the suction pipe 10a of the suction pump 10 in a state in which the valve mechanism V is provided and is installed in the discharge pipe 10b of the suction pump 10 A check valve (CV) for preventing the backflow is applied to the front side of the valve mechanism (V).

When the system of the present invention is constructed so that the cleaning liquid 15a can be supplied to the hollow fiber membrane module 5 by the suction pump 10 as described above, the water level control tube 14 and the cleaning liquid supply tube 16, The opening and closing operation of the mechanism V and the supply of the cleaning liquid to the hollow fiber membrane module 5 according to the operation of the suction pump 10 and the supply of air to the hollow fiber membrane module 5 by the blower 9, It is more preferable from the viewpoint of efficient operation of the system that the cleaning operation of the hollow fiber membrane module 5 is automatically carried out according to the start time.

2, the valve mechanism V provided in the water level control pipe 14 and the cleaning liquid pipe 16 is a solenoid valve SV, and whether or not the filtrate is discharged into the water level control pipe 14 The flow meter 14a or the water level sensor 14b is connected to the control cable 17 after the flow meter 14a for sensing the flow rate of water is installed in the membrane separation tank 4 or the water level sensor 14b is installed in the membrane separation tank 4, And the controller is connected to the solenoid valve SV and the suction pump 10 by means of the control cable 17. [

Of course, only the valve mechanism V provided in the level control pipe 14 is a solenoid valve SV and the solenoid valve SV is connected to the flow meter 14a of the level control pipe 14 or the membrane separation tank 4 It is possible to automate only the level adjustment operation of the filtrate stored in the membrane separation tank 4, but if the condition for further constructing the control system is to be controlled, the operation of the hollow fiber membrane module 5 It is more economical to automate all the processes required for the cleaning operation.

The air supply to the hollow fiber membrane module 5 by the blower 9 is also controlled by the controller in order to automate all processes required for cleaning the hollow fiber membrane module 5 as described above. A total of two blowers 9 including a blower 9 used as a blower 9 and a blower 9 used for aeration tank 3 and a hollow fiber membrane module 5 are installed. The valve mechanism V of the air injection line 9a connected to the module 5 is set to the electromagnetic valve SV and the solenoid valve SV and the common blower 9 are connected to the controller control cable 17 If the separate blower 9 is provided exclusively for the hollow fiber membrane module 5, the blower 9 itself may be controlled.

As soon as the water level of the membrane separation tank 4 reaches a required level for the cleaning operation of the hollow fiber membrane module 5, the flow rate of the water in the flow meter 14a or The water level sensor 14b in the membrane separation tank 4 senses this to close the solenoid valve SV of the level control pipe 14 and open the solenoid valve SV of the cleaning liquid supply pipe 16, The washing liquid 15a is supplied to the hollow fiber membrane module 5 by the reverse operation of the pump 10 and the air is supplied to the hollow fiber membrane module 5 by the blower 9, It is possible to perform the operation automatically.

3 and 4 illustrate a hollow fiber membrane module 5 used in the present invention. The hollow fiber membrane module 5 includes a frame case 18 assembled in the form of a hexahedron frame by using a rectangular pipe frame, A holding tube 21 in the form of a pipe is provided so as to be transversely connected and a connection portion 21a provided for each holding tube 21 is provided between the upper side holding tube 21 and the lower side holding tube 21. [ And the hollow fiber 20a is connected to the hollow fiber 20a at a closely spaced interval.

The connecting portion 21a connects the respective hollow fibers 20a to the holding tube 21 and communicates the hollow fibers 20a with the inner space of the holding tube 21, A connecting pipe portion 21b for communicating the inner space of the rectangular pipe constituting the frame case 18 with the inner space of the holding tube 21 is provided on both sides of each holding tube 21, The connecting hose 11 extending from the suction pipe 10a is connected to each holding tube 21 through the inlet pipe 19 at the same time.

As described above, a method of simultaneously connecting the inlet pipe 19 for the suction pump 10 to the respective holding tubes 21 may be variously applied. However, in a representative example, each holding tube 21 may be horizontally And a pipe frame (not shown) is connected to a central portion of the lower side pipe frame, and the introduction pipe 19 is connected to the central portion of the pipe frame in the vertical direction, (18b) for transporting the hollow fiber membrane module (5) is provided on the upper end side of the hollow fiber membrane module (18).

A pair of injection pipes 22 are fixed to the bottom of the frame case 18 by a clamp 22a and spray holes 22b are formed at regular intervals along the injection pipe 22. [ And each of the injection pipes 22 is connected to an air supply pipe 19a by a connecting pipe 23 and the air supply pipe 19a is connected to an air injection line 9a extending from the blower 9 As a result, the air supplied from the blower 9 can be floated in the form of bubbles, and the cleaning (scrubbing) operation of the hollow fiber membrane 20 can be performed.

The hollow fiber membrane module 5 shown in FIGS. 3 and 4 is only one representative example applicable to the present invention, and the hollow fiber membrane module 5 used in the present invention is not limited to the one shown in FIGS. 3 and 4 And various types of hollow fiber membrane modules capable of performing solid-liquid separation of sludge and treated water have been produced and marketed. In this case, any number of products required for the system of the present invention can be selected It can be applied.

1: Wastewater treatment system 2: Water collecting tank
2a: inlet pipe 3: aeration tank 3a: overflow passage
3b, 4b: drain pipe 4: membrane separation tank 4a: partition wall
5: hollow fiber membrane module 6: treated water tank 6a: discharge pipe
7: sludge storage tank 7a: sludge discharge pipe 7b: return pipe
8: Feed pump 8a: Feed pipe 9: Blower
9a: air injection line 9b: bubble diffuser 10: suction pump
10a: suction pipe 10b: discharge pipe 10c: flow meter
11: connecting hose 12: sludge conveying pipe 12a: sludge collecting part
13: overflow pipe 14: water level control pipe 14a: flow meter
14b: level sensor 15: cleaning liquid tank 15a: cleaning liquid
16: cleaning liquid supply pipe 17: control cable 18: frame case
18a: reinforcing frame 18b: conveying ring 19: introduction pipe
19a: air supply pipe 20: hollow fiber membrane 20a: hollow fiber membrane
21: holding tube 21a: connecting portion 21b: connecting tube portion
22: injection pipe 22a: clamp 22b:
23: Connector V: Valve mechanism CV: Check valve
SV: Solenoid valve

Claims (6)

delete delete An aeration tank 3 for supplying wastewater containing a sludge component via a water collecting tank 2 into which wastewater flows and a transfer pump 8 installed inside the water collecting tank 2; A hollow fiber membrane module 5 inserted and immersed in the inside of the membrane separation tank 4 from which the first treated water treated in the membrane separation tank 4 flows, And a sludge storage tank 7 for storing and collecting the sludge components discharged from the membrane separation tank 4. The sludge storage tank 7 is connected to the aeration tank 4 through the aeration tank 4, The bubble dispersing unit 9b and the hollow fiber membrane module 5 are connected to the blower 9 by the air injection line 9a. The bubble dispersing unit 9b is disposed inside the water collecting tank 2 and the aeration tank 3, And an overflow pipe 13 extending to the water collecting tank 2 is connected to the upper portion of the membrane separation tank 4 A drain pipe 3b and a drain pipe 4b extending to the water collecting tank 2 are connected to the bottom of the aeration tank 3 and the membrane separation tank 4 in a state having a valve mechanism V, (7) is connected to a return pipe (7b) extending to the water collecting tank (2) at an upper side of the water collecting tank (7)
The sludge storage tank 7 is disposed at a lower position than the membrane separation tank 4 while the sedimented sludge component is transferred to the bottom of the membrane separation tank 4 by the water pressure and its own weight to the sludge storage tank 7 A sludge transport line 12 is connected to the sludge transport line 12, a valve mechanism V is installed in the sludge transport line 12,
The water level control pipe 14 having a valve mechanism V is connected to the membrane separation tank 4 at a position corresponding to the height of the hollow fiber membrane module 5, The water level control pipe 14 itself is connected to the flow pipe 13 or extends to the water collecting tank 2,
The suction pump 10 is a suction and cleaning pump capable of bidirectional driving and the suction pipe 10a of the suction pump 10 is connected to the hollow fiber membrane module 5 in a state having the valve mechanism V On the other hand, the discharge pipe 10b of the suction pump 10 is extended to the treatment water tank 6 with the valve mechanism V,
A cleaning liquid supply pipe 16 of the cleaning liquid tank 15 is connected to the suction pipe 10a or the discharge pipe 10b at a position before the valve mechanism V and a valve mechanism V is installed in the cleaning liquid supply pipe 16 Wherein the energy recovery type wastewater advanced treatment system uses a membrane separation tank. delete The vacuum cleaner according to claim 3, wherein the valve mechanism (V) installed in the level control pipe (14) and the cleaning liquid supply pipe (16) is a solenoid valve (SV) 10 and the supply of air to the hollow fiber membrane module 5 by the blower 9 is performed by a flow meter 14a provided in the level control pipe 14 or a level sensor installed in the membrane separation tank 4 14b. The system for treating wastewater according to claim 1, The sludge collecting device according to claim 3 or 5, wherein a funnel-shaped sludge collecting part (12a) is formed on the bottom side of the membrane separation tank (4), and the sludge transport pipe (12) And an energy saving type wastewater advanced treatment system using the membrane separation tank.

Images