JPS5835725B2 - lokadatsu suisouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for filtering and dewatering sludge, sludge, and all kinds of muddy substances generated during water and sewage treatment, wastewater treatment, and the like.

In general, various types of mud have poor dewatering properties, making their treatment extremely difficult.

Conventionally, methods for dehydrating sludge include machines such as the vacuum p method using a vacuum pump, the pressurized method using various liquid pumps or compressed air, and the centrifugal dehydration method using centrifugal force inside a high-speed rotating body. A natural dehydration method and an open fire drying method that utilizes natural evaporation dehydration using solar heat or wind have been proposed.

However, in the former method, various attached mechanisms for creating a vacuum, applying pressure, and centrifugal force are complicated and difficult to scale up, and furthermore, it requires a large amount of power and energy for operation, making it uneconomical. It's not even the first thing to say.

The latter method does not require as much power or energy as the former, but it requires a vast site for the facility and long days for evaporation, making it unsuitable.

The present invention eliminates the drawbacks of these conventional methods, has an extremely simple structure, does not require special power or energy unlike the conventional methods, and is an economical device for efficiently filtering and dewatering muddy materials. The purpose is to provide the following.

The present invention connects the upper part of the liquid storage tank that can be sealed and can form an atmospheric leg with a predetermined height, and the lower part of the sludge storage tank provided with a filtration material in a sealed state with the atmosphere, and opens and closes the upper part of the liquid storage tank. A liquid inflow pipe equipped with a valve that can be opened and a filtrate discharge pipe equipped with a valve that can be opened and closed are provided at the bottom of the liquid storage tank. The upper part is a sludge storage tank, the lower part is a sealable liquid storage tank that can form an atmospheric leg of a predetermined height, and the liquid storage tank has a liquid inlet pipe equipped with a valve that can be opened and closed at the upper part of the liquid storage tank. F liquid discharge pipes each having a valve that can be opened and closed are provided at the bottom thereof, and a partition plate is vertically provided in the liquid storage tank so that only the lower end of the partition plate communicates with the F liquid discharge pipe, and the lower end of the partition plate is connected to the It is characterized by being located below the opening of the liquid discharge pipe.

An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a tank body 1 is partitioned into upper and lower parts through a filter material 2, with a sludge storage tank 3 in the upper part and a space in the lower part. A liquid storage tank 4 that holds liquid is provided with a p-liquid discharge pipe 6 equipped with a valve 5 at the lower side of the liquid storage tank 4, and a liquid inflow pipe 8 equipped with a valve 7 at its upper side. is connected.

In the figure, 6' is the opening, 9 is the slurry to be filtered and dehydrated, and 10
indicates a liquid, and 11 indicates a space formed above the liquid 10 at the bottom of the filter medium 2.

Furthermore, instead of using the single tank body 1 as described above, the sludge storage tank 3 and the liquid storage tank 4 can be separated, and the lower part of the sludge storage tank 3 and the upper part of the liquid storage tank 4 can be connected by a connecting pipe. You can.

The example in FIG. 2 shows a case where a sludge storage tank 3 and a liquid storage tank 4 are separated and a plurality of sludge storage tanks 3 are provided. It is connected.

In addition, the example in FIG. 4 has a partition plate 1 inside the liquid storage tank 4 in the example in FIG.
3 vertically vertically partitioning the inside of the tank into an appropriate number of sections.The interior of each partition is communicated only at the bottom end of the partition plate 13, and the position of this communication section (i.e., the bottom end of the partition plate 13) is Said opening! It is set below 6'.

Among them, the tip part 14 of the F liquid discharge pipe 6 which is buttoned in each of the above-mentioned examples is temporarily immersed in the liquid 16 in the water tank 15 to form a water seal structure, as shown in FIG. It is preferable to prevent air from flowing into the liquid storage tank 4.

1 and 2, the valve 5 is closed and the valve I is opened, and after a certain amount of water or other liquid 10 flows into the liquid storage tank 4 from the liquid inflow pipe 8, the sludge is stored. A filter material 2 is prepared in a tank 3, and then a certain amount of mud 9 is flowed in so as to seal the upper part of the filter material 2.

The order in which the muddy material 9 flows in and the liquid 10 flows in may be in any order, and when the liquid 10 flows in after the muddy material 9 flows in, an air vent hole for removing air from the liquid storage tank 4, etc. (not shown) may be provided in the ancient capital on the tank.

Next, when the valve 7 is closed (if a separate air vent hole is provided, this is also closed) and then the valve 5 is opened, the liquid 10 flows out from the opening 6' due to its own weight, and at the same time as the water level of the liquid 10 falls, the liquid 10 The pressure in the space 11 above (below the filter material 2) becomes a negative pressure below atmospheric pressure, and at a certain height the liquid 1
The outflow of 0 evaporates and the liquid 10 becomes stationary.

The degree of negative pressure generated within this space 11 is
For example, if water with a density HF/cA is used as the liquid 10, the height 1 is determined by the atmospheric pressure.
When supported at 0 mt, the inside of the space 11 becomes almost a complete vacuum, and similarly when the button is 5 m high, the pressure becomes approximately 0.5 atm.

In addition, if mercury with a density of 136 y/cd is used and is supported at a height of 76 cm" by atmospheric pressure, the space 1
There is almost a complete vacuum inside 1, and when the button is also pressed at a height of 38 cm, the pressure becomes approximately 0.5 atm.

In other words, the degree of vacuum in this case is 10 spaces before the liquid 10 flows out.
It is determined by the ratio of the air volume in 1 to the volume of the liquid flowing out,
The smaller the ratio, the higher the degree of vacuum (lower the absolute pressure).

In this way, the sludge 9 is filtered and dehydrated by the negative pressure generated in the space 11, and the synovial fluid passes through the filter material 2 and is discharged into the liquid storage tank 4. The liquid 10 in the space 4 flows out through the opening 6' and is filtered and dehydrated while the negative pressure in the space 11 remains constant without changing, and a dehydrated cake is quickly formed.

When repeating such dewatering operation, after closing the valve 5, the dehydrated cake is scraped off from the surface of the filter material 2 by a machine or manually, and if necessary, the liquid is replenished into the liquid storage tank 4, and the sludge storage tank 3 is drained. After letting the mud flow in again, valve 5
, and repeat the same dehydration operation as above.

Further, the example in FIG. 2 shows a case where a plurality of sludge storage tanks 3 are connected to a single liquid storage tank 4, but in this case, the negative pressure generation operation below the p-filter material 2 of each sludge storage tank 3 is performed. is the same as the example in FIG. 1, and by opening and closing valves 17 provided in each pipe 12, filtration and dewatering can be carried out in any desired sludge storage tank 30.

Furthermore, the example shown in FIG. 4 has essentially the same effect as the examples shown in FIGS. This is in case a crack 18 occurs.

That is, if even one crack 18 occurs in the mud 9,
The negative pressure space 11 below the filter material 2 below the crack becomes equal to the atmospheric pressure, and all the liquid 10 in the liquid storage tank 4 flows into the opening 6'.
This prevents more water from flowing out and making it impossible to continue p-excess dehydration due to negative pressure.

In this case, since the inside of the liquid storage tank 4 is partitioned into a plurality of small chambers by the partition plate 13, only the small chamber under the crack is equal to the atmospheric pressure due to the crack 18, and the liquid inside the chamber becomes equal to atmospheric pressure. Only the aperture 6' flows out from the aperture 6'.
is higher than the communication section at the bottom end of each chamber, so the water level in the chamber does not fall below the level where each chamber is water-sealed, and it is possible to continue filtration and dehydration using negative pressure in chambers other than the cracks. .

As described above, according to the present invention, sludge can be filtered and dehydrated using the negative pressure generated by the weight of the stationary liquid supported by the atmospheric pressure in the lower part of the filtration unit, and with simple equipment, it is possible to Does not require special power or energy,
It has the advantages of being easy to operate, increasing the dewatering efficiency, simplifying the filtration and dewatering work, shortening the processing time, and significantly reducing the processing cost, which is extremely useful in industry.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention, FIGS. 2 and 4 are longitudinal sectional views showing other embodiments, and FIG. 3 is an example of the tip of a water-sealable opening. FIG. 1...tank body, 2...filtering material, 3...
...Sludge storage tank, 4...Liquid storage tank, 6...
... Synovial fluid drainage tube, 6'... Opening part, 8...
...Liquid inflow pipe, 9...Mud, 10...
...Liquid, 11...Space, 13...
・Partition board.

Claims (1)

[Scope of Claims] 1. A sealable upper part of a liquid storage tank capable of forming an atmospheric leg of a predetermined height and a lower part of a sludge storage tank provided with a filtration material are communicated with the atmosphere in a sealed state, and the liquid storage tank is A filtration and dehydration device characterized in that a liquid inflow pipe is provided with a valve that can be opened and closed at the top thereof, and an F liquid discharge pipe is provided with a valve that can be opened and closed at the bottom of the liquid storage tank. 2 The upper part of the tank body partitioned into upper and lower parts by filtration material is used as a sludge storage tank, and the lower part is a sealable liquid storage tank that can form an atmospheric leg of a predetermined height. a liquid inlet pipe equipped with a valve that can be opened and a filtrate discharge pipe equipped with a valve that can be opened and closed at the bottom of the liquid storage tank;
Further, a partition plate is vertically provided in the liquid storage tank so that only the lower end of the partition plate is communicated with the lower end of the partition plate, and the lower end of the partition plate is located below the opening of the finished liquid discharge pipe. filtration and dehydration equipment.