JPS60190209A - Method and apparatus for discharging concentrated sludge - Google Patents

Abstract

PURPOSE:To make it possible to discharge concn. sludge out of an apparatus with good efficiency, by receiving concn. sludge in an expansible and shrinkable bag and enabling the discharge of said sludge by the water head pressure of a filter tank. CONSTITUTION:The filtering concn. work of sludge is allowed to advance in a filter tank 1 and concn. sludge with a proper thickness is formed to the surface of each filter plate 2 and, thereafter, the sludge in the filter tank 1 is withdrawn from a raw sludge supply pipe 10. The conc. sludge adhered to each filter plate 2 is thereafter peeled off by air blow and the conc. cake is fallen in a storage part 5 through an opened valve mechanism 4. The valve mechanism 4 is hermetically closed in this state and new raw sludge is supplied into the filter tank 1 and the valve 12 of a conc. sludge discharge pipe 11 is opened simultaneously with the start of filtering to allow the water head pressure in the filter tank 1 and the raw sludge supply pipe 10 on a bag 7 to compress said bag 7 while the concn. sludge in the bag 7 is squeezed out and discharged to the outside from a concn. sludge discharge pipe 11. At this time, the filtering work in the filter tank 1 is advancing simultaneously.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for discharging thickened sludge, and more particularly to a method and apparatus for efficiently discharging thickened sludge produced in a FiM thickening apparatus.

Generally, water sludge discharged from water supply plants contains more than 90% water, so before caking treatment, water sludge is passed through an overload chamber to reduce the moisture content of water sludge. After lowering the temperature, it is processed into cake.

An r-overload is a system in which a plurality of r-overboards are installed vertically at equal intervals, each having a flow path for the r-liquid inside, the surface covered with r-cloth and an r-liquid discharge pipe attached to the upper end. The moisture of the sludge supplied into the overload is absorbed into the r-filter plate and flows out from the r-liquid discharge pipe, and the sludge particles that are concentrated and attached to the r-filter plate surface become concentrated sludge of an appropriate thickness. When this happens, it should be peeled off from the overboard and discharged from the bottom of the tank.

Figure 1 shows the conventional Fit! An example of a 54-condensing device is shown, and in the same figure, A is an overload with a large number of overload plates inside, and raw sludge is supplied from valve B into this overload A to perform overconcentration work. After thickened sludge of appropriate thickness is generated on the surface of each r-filter plate, the sludge other than the thickened sludge is extracted, and then the thickened sludge on the surface of the r-filter plate is peeled off by air blowing, and the screw container is installed at the bottom of the tank. The concentrated sludge is further discharged from the concentrated sludge discharge device C to the outside via a discharge pump D.

In such a conventional superconcentrator, each of the following steps constitutes one cycle.

Raw sludge supply - r Overconcentration → Remaining sludge extraction → Thickened sludge peeling - Thickened sludge discharge. Only after this step is completed can the next cycle raw sludge supply step be started, but the conventional technology has the drawback of long loss time for processes other than r-overconcentration.

That is, raw sludge supply, 15 molecule superconcentration, 60 minutes, residual sludge removal, 15 minutes, thickened sludge stripping, 5 minutes, thickened sludge discharge, 20 minutes or more, and a total of 115 minutes, but since thickened sludge has poor fluidity, the above-mentioned The discharge process in the thickened sludge discharge device C takes a particularly long time.

In addition, expensive equipment such as screw conveyors and discharge pumps are required to discharge the thickened sludge, which increases equipment costs. Therefore, maintenance costs are high and sludge leaks from the screw conveyor shaft seal.

In view of the above-mentioned conventional overconcentration equipment, the present invention installs a thickened sludge storage section through a valve mechanism in the lower part of the overloaded area, and discharges the thickened sludge without requiring discharge power. It is an object of the present invention to provide a method for discharging thickened sludge from a superconcentrator, which is performed simultaneously with the superconcentration step, and whose capacity is increased by shortening the loss time, and an apparatus therefor.

An embodiment of the present invention will be described in detail below with reference to the drawings.

In Figs. 2 to 4, reference numeral 1 denotes an r-overload, which is a conventionally known type in which a large number of r-overboards 2 are erected at equal intervals inside, and a JF' liquid discharge pipe 3 is connected to the upper part. .

A thickened sludge storage section 5 is installed under the r overload 1 via a valve mechanism 4.

The inner surfaces of the valve mechanism 4 and the storage section 5 are loaded with a seal 6 and a bag 7 that are opened and closed by a hose that expands and contracts with gas or liquid. The seal 6 and the bag 7 are in the form of an integral bag with an open top, and the seal 6 is fixed to the case 8 at the top of the opening and the neck of the storage section 5, as shown in FIG.

An expansion hose connected to a hydraulic or pneumatic supply pipe 9 is connected to the valve mechanism 4, and a concentrated sludge discharge port connected to a concentrated sludge discharge pipe 11 is connected to the side of the bulkhead. A sludge supply pipe 10 is connected.

In the above configuration, raw sludge is supplied from the raw sludge supply pipe 10 into the excess volume l in the same manner as in the past. At this time, in order to prevent sludge from flowing into the storage section 5, hydraulic or air pressure is applied to the expansion hose to press the seals 6 from the left and right sides as shown by the chain lines in FIG. 5, thereby sealing the valve mechanism 4. The seal 6 may be pressed by an effective one-sided pneumatic pressure or by a mechanical pinch type.

The sludge overconcentration work progresses in the overload 1, and each
After thickened sludge of appropriate thickness is generated on the surface of the overload plate 2, overload 1
The sludge inside is extracted from the raw sludge supply pipe 10. Thereafter, the concentrated sludge adhering to each r-filter plate 2 is removed by air blowing, and the concentrated cake is dropped into the storage section 5 through the valve mechanism 4 that opens. In this state, the valve mechanism 4 is sealed in the same manner as described above, new raw sludge is supplied into the excess volume 1, and the valve 12 of the concentrated sludge discharge pipe 11 is
By opening it, the water head pressure in the r overtank 1 and the supply pipe 10 acts on the bag 7, compressing the bag 7, and the concentrated lr5 mud in the bag 7 is squeezed and discharged from the discharge pipe 11 to the outside. .

At this time, the r-over work in the r-over tank 1 is progressing simultaneously. Therefore, raw sludge supply - r superconcentration - residual sludge extraction - concentration l
In the cycle of sludge discharge, overconcentration and concentrated sludge discharge work can be performed simultaneously, and the cycle time can be shortened as described below.

Raw sludge supply 15 molecules iI! JR compaction 60 minutes residual sludge removal 15 minutes thickened sludge removal 5 minutes valve mechanism closed 1 minute The total cycle time can be made 96 minutes, and the efficiency rate is 16.5% compared to the conventional method, which is more expensive. Comprehensively comparing features such as not requiring a screw conveyor or discharge pump and saving drive power, the equipment cost is less than 1/10 and the running cost is less than 1/25 compared to conventional methods.

In the above description, the valve mechanism 4 can be sealed by hydraulic pressure, pneumatic pressure, etc., but the present invention is not limited to this, and the seal 6 may be able to be pressed by mechanical pressure.

As described above, according to the present invention, the thickened sludge is housed in the bag 7 that can be expanded and contracted, and the thickened sludge can be discharged using excess water head pressure, thereby making it possible to effectively discharge the thickened sludge with a simple device. Furthermore, the discharge of thickened sludge and the superconcentration work can be performed simultaneously, and the superconcentration efficiency can be increased as a result.

[Brief explanation of drawings]

FIG. 1 is a schematic front view showing an example of a conventional r-perconcentrator;
FIG. 2 is a schematic front view showing an embodiment of the superconcentrator of the present invention, FIG. 3 is an enlarged front view of the main parts, and FIG. 4 is a
A schematic sectional view taken along the line A, and FIG. 5 is an enlarged sectional view of the main parts. 1 is r overload, 2 is r overboard, 4 is valve mechanism, 5 is storage section, 6 is seal, 7 is bag, IO is raw sludge supply pipe, 11
is the thickened sludge discharge pipe. Figure 1 Figure 2

Claims (1)

[Scope of Claims] +1): A plurality of r-pass plates made of r-sperm surrounding the f' passage chamber are suspended in an overloaded sludge chamber, and the water in the sludge is removed by r.
In a superconcentrator in which liquid is discharged through a liquid discharge pipe that is connected to a liquid discharge chamber, a thickened sludge storage section is connected to the lower part of the liquid through a valve mechanism. A method for discharging thickened sludge in a super-thickener, characterized in that after receiving the thickened sludge, the valve mechanism is closed and the thickened sludge is discharged at the same time as the super-thickening step. (2) The r overplate formed by surrounding the r overchamber with r spermatozoa is r
A superconcentrator in which multiple sheets of sludge are suspended in an overloaded sludge chamber, water in the sludge passes through the sludge chamber, and the sludge is discharged through a liquid discharge pipe connected to the sludge chamber. In, r
A thickened sludge storage section loaded with a deformable bag via a valve mechanism is provided at the bottom of the overloaded area, and after receiving the thickened sludge, the valve mechanism is closed and the overloaded raw sludge is pressurized from the outside of the bag by the head of the overloaded raw sludge and discharged. A method for discharging thickened sludge in an f-concentrator, characterized in that: (3) The superconcentrator described in claims 1 and 2 is characterized in that the valve mechanism is a pinch or diphragm type valve that opens and closes by expanding and contracting with gas or liquid. r A device for discharging thickened sludge in a superconcentrator.