JPS6157043B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for superconcentrating sludge in water purification plants, sewage, etc.

As this type of superconcentration apparatus, vacuum filtration machines, pressure filtration machines, overbeds, etc. have been commonly used. However, since vacuum filtration machines and pressure filtration machines force the liquid to pass through the material, cakes may become clogged in the pores of the material, or cakes stacked on the material may become too close to the surface of the material. Since the concentration increases, there is a drawback that over-resistance increases over time. In addition, overbeds do not require mechanical forcing on the liquid to be filtrated, but when separating the cake from the overlayer, gravel, etc. that make up the overlayer may be mixed with the cake and discharged, or the equipment size is large. Therefore, there is a drawback that maintenance is troublesome.

In order to eliminate such drawbacks of conventional superconcentrators, the applicant first places a liquid-absorbing filter plate in the superconcentrator tank, and inserts a liquid discharge pipe into the interior of the filter plate to drain the liquid. By configuring the over-discharge pipe to lead out from the bottom of the over-concentrator tank, the moisture in the over-concentrating liquid can be absorbed into the over-plate by the capillary action of the over-concentrator and then discharged to the outside via the liquid discharge pipe. We have developed a superconcentration device that does not clog the overplate, and also makes it easy to peel off the cake adhering to the overflowing liquid, and have filed a patent application.

However, the superconcentrator according to the patent application is configured to direct the liquid discharge pipe leading from the liquid-absorbing overplate toward the bottom of the superconcentrator tank for natural drainage, so the overpressure generated in the superconcentrator is reduced. The cake becomes higher at the lower part, and the cake that adheres to the liquid is formed thicker at the lower part.As a result, the filtration characteristics on the filtration surface become uneven and the filtration capacity is reduced. Furthermore, since the connecting portion between the overplate and the liquid discharge pipe forms the bottom of the superconcentration tank, there is a drawback that it is inconvenient to attach and remove the overplate when replacing it.

In order to overcome all the problems of the conventional superconcentrator described above, the inventor of the present invention conducted various studies and made prototypes, and as a result, the present inventor inserted a liquid discharge pipe into the upper part of the superconcentrator and used the superconcentrator to remove the superconcentrator. By extracting the liquid from the outer periphery of the tank and connecting this over-discharge pipe to a siphon pipe of a predetermined length, the liquid absorbed by the over-board is suctioned and drained by natural force.
It has been found that the overpressure of the entire overplate can be maintained uniformly, and the operation of attaching and detaching the overplate becomes simple, and the above problems can be solved at once.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to maintain uniform overpressure across the overplate, facilitate separation and removal of cake, and improve overcapacity, and also facilitate maintenance work by making it easy to attach and remove the overplate. To provide superconcentration equipment.

In order to achieve the above object, in the present invention, a liquid-absorbing filter plate is arranged in a superconcentrator tank, one end of a liquid discharge pipe is connected to the filter plate, and the other end of the liquid discharge pipe is connected to the filter plate. It is characterized by being communicatively connected to a siphon pipe provided outside the concentration tank.

In the above superconcentrator, the liquid discharge pipe is
It is advantageous if a separable connection is provided, arranged horizontally and connected to the upper part of the siphon tube.

Further, it is preferable that the siphon pipe is provided with an air vent valve at its upper end and a trap at its lower end.

Next, embodiments of the superconcentrator according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates a superconcentrator tank, and in this superconcentrator tank 10 there is at least one
Two liquid-absorbing overboards 12 are provided. The liquid-absorbing overboard 12 is made of a nonwoven fabric such as nylon, Tetron, or metal fiber, sponge, or sand processed into a board of a predetermined thickness, and preferably has cloth pasted on both sides of the board. is preferably used. The superplate 12 configured in this way is used as the superconcentrator tank 10.
It is positioned below the liquid level of the superconcentration tank 10 so that the liquid to be permeated can flow over the entire outer circumference thereof. The bottom of the superconcentrator tank 10 is suitably shaped like a hopper, and a cake discharge valve 1 is installed at the lower end.
A cake outlet 16 with 4 is provided.

On the other hand, one end of a liquid discharge pipe 18 is inserted through the upper part of the overboard 12, and the other end of the liquid discharge pipe 18 is led out to the outside of the superconcentration tank 10 via a connection part 20 which can be separated as appropriate. In addition, liquid discharge pipe 1
8 is attached horizontally to the superconcentrating tank 10 and is separated at the connection part 20, so that the superconcentrating plate 12 can be easily removed from the upper part of the superconcentrating tank 10. The other end of the liquid discharge pipe 18 led out to the outside of the superconcentration tank 10 is connected to the upper part of a vertically arranged siphon pipe 22 . siphon tube 22
An air vent valve 24 is provided at the upper end to open the air to the atmosphere.
Further, a trap 26 is provided at the lower part of the siphon pipe 22 to prevent air from flowing back into the pipe and generating air pressure, thereby preventing the siphon effect from being reduced. Note that an on-off valve 28 is appropriately provided in a part of the siphon pipe 22 to control the discharge of the liquid. Further, the length of the siphon pipe 22 can be arbitrarily set depending on the required reduced pressure or overpressure on the overplate 12.

The superconcentrator according to the present invention having the above-mentioned configuration opens the air vent valve 24 provided at the upper end of the siphon pipe 22 at the initial stage of overconcentration, so that the air in the overplate 12 is shortened by the water pressure in the tank. In time, the liquid can be discharged to the outside via the liquid discharge pipe 18. Next, when the air vent valve 24 is closed and the on-off valve 28 provided in the siphon pipe 22 is opened, the liquid naturally flows downward due to the siphon effect of the siphon pipe 22 and is discharged to the outside through the trap 26. In this case, the amount of liquid discharged is relatively small, but since the lower end of the siphon tube 22 is sealed with liquid by the trap 26, stable liquid discharge can always be ensured without reducing the siphon effect. .

As described above, the superconcentrator according to the present invention can maintain the same pressure in all the liquid plates by using the head pressure in the tank and the reduced pressure due to the siphon effect, and the overpressure can be uniformly distributed over the entire surface of the liquid plate. can do. Therefore, a cake of uniform thickness can always be formed on the liquid plate, and the cake can be easily peeled off, so that the overcapacity of the overplate can always be kept constant.

In addition, the superconcentration device according to the present invention has a structure in which the liquid is discharged from the upper part of the overboard, and the liquid is allowed to flow down by gravity due to the siphon effect.
Not only can the overcapacity be increased, but the overconcentrator plate and liquid discharge pipe can be easily attached and removed from the top of the overconcentrator tank, which not only simplifies maintenance work but also improves the initial stage of overconcentration. The effect of contributing to improving the performance of this type of superconcentrator is extremely large, such as the fact that the air in the superconcentrator plate can be quickly removed.

Although the preferred embodiments of the present invention have been described above, it goes without saying that various design changes can be made without departing from the spirit of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a structural layout diagram showing an embodiment of a superconcentrator according to the present invention. 10... superconcentrator tank, 12... superplate, 14...
...Cake discharge valve, 16...Cake discharge port, 18...
...liquid discharge pipe, 20...connection section, 22...siphon pipe, 24...air vent valve, 26...trap, 2
8...Opening/closing valve.

Claims (1)

[Scope of Claims] 1. A liquid-absorbing overplate is arranged in a superconcentration tank, one end of a liquid discharge pipe is connected to the overplate, and the other end of the liquid discharge pipe is provided outside the superconcentration tank. A superconcentration device characterized by being connected in communication with a siphon pipe. 2. The superconcentrator according to claim 1, wherein the liquid discharge pipe is horizontally arranged with a separable connection part and is connected to the upper part of the siphon pipe. 3. The superconcentrator according to claim 1 or 2, wherein the siphon pipe has an air vent valve at its upper end and a trap at its lower end.