JPS6018299A - Method and device for dehydrating sludge - Google Patents

Abstract

PURPOSE:To enable treatment of a large volume in a narrow site by providing a filter cloth belt between two sheets of filter cloth belts and traveling the belts while supplying sludge into the spacings between these filter cloth belts. CONSTITUTION:The revolving shafts of rollers 5a and 5c for compressing sludge are moved to bring filter cloths 1, 2 and 3 into partial pressure contact with each other. When a sludge roller 5' is rotated in this state, the belts 1, 2 and 3 are cyclically traveled counterclockwise. When sludge S is supplied to feed boxes 4b and 4c, the sludge is conveyed by the belts 2, 3 and is dehydrated by gravity in the sloped parts thereof and thereafter the sludge on the belt 2 is grasped with pressure by the belts 2 and 1 and the sludge on the belt 3 by the belts 3 and 2 respectively. The sluge is pressurized and dehydrated at the rollers 5a, 5c, 5' by the tension, moving tension and shearing force of the respective filter cloth belts. The dehydrated sludge is stripped by gravity or a scraper 7 from the belts and is discharged to the outside of the system.

Description

DETAILED DESCRIPTION OF THE INVENTION 1. Technical Field of the Invention The present invention relates to a method and apparatus for dewatering sludge, which is frequently generated in treatment facilities for sewage, human waste, various industrial wastewater, and the like.

2. Description of the Prior Art In recent years, with the expansion of treatment facilities for sewage, human waste, various industrial wastewater, etc., the amount of sludge generated has been increasing year by year. Therefore, the load on sludge treatment equipment has increased, making it necessary to expand the equipment, and even if new sludge treatment equipment is to be installed, it is becoming difficult to secure land. There is a need for a sludge treatment method that can process large amounts of sludge.

61 Purpose of invention The present invention attempts to meet this need.

The object of the present invention is to provide a sludge dewatering method and apparatus that enable large-volume treatment of sludge.

4. Structure of the Invention The present invention is a method in which sludge is conveyed by an endless P cloth belt and dehydrated under pressure by a plurality of rotating rollers, and the belt is hung around a plurality of sludge squeezing rollers so that it can run in parallel. 1 or 2 or more 1-cloth belts 2 between the 2 r-cloth belts 1 and 6
While supplying sludge to the gaps between each of these R cloth belts 1, 2, and 3, at least one of the P cloth belts 1 and 6 is forcibly run, and the sludge is clamped by these F cloth belts 1 and 6. This method of dewatering sludge is characterized by running a sawcloth belt 2 to dewater the sludge using the frictional force of the sludge.

Furthermore, the present invention provides an apparatus for transporting sludge using an endless r-cloth belt and pressurizing and dewatering it using a plurality of rotating rollers, in which endless r-cloth belts 1 and 3, at least one of which is forced to run, are used. The sludge squeezing roller is hung so that the respective sludge squeezing surfaces face each other and are separated from each other, and one or more endless sawn cloth belts 2 are hung on the idler roller, and a portion of the belt in the longitudinal direction is This is a sludge dewatering treatment apparatus characterized in that the r-cloth belts 1 and 3 are disposed so as to be located in the separation gap between them.

5. Embodiments of the invention Embodiments of the present invention will be specifically explained with reference to the drawings.

The endless f-cloth belt 1 is hung around a plurality of guide rollers 6a which are idle rollers and a plurality of sludge squeezing rollers 5a among the idle rollers, and the endless sawcloth belt 6 is hung around a plurality of sludge squeezing rollers 5a which are idle rollers. A guide roller 6c and a plurality of sludge pressing rollers 5 having the same structure as the sludge pressing roller 5a.
c and the sludge squeezing roller 5' which is forcibly rotated.

The R cloth belts 1 and 6 are hung on the sludge squeezing roller group so as to be spaced apart from each other and facing each other.
A plurality of endless r-cloth belts 2 are arranged so as to be located in a gap between the P-cloth belts 1 and 3. 4b in the diagram
, 4c is a feed box, 7 is a scraper, and 8 is a cleaning nozzle for cleaning the jli cloth belt.

The rotating shafts of the sludge squeezing rollers 5a and 5c are independently movable in the vertical direction in the drawing, and the tension of the 1-cloth belt 1.3 can be adjusted, and the P-cloth belt 2 is also connected to the guide roller 6b.
Tension can be adjusted by moving the rotating shaft.

Therefore, if the rotation shafts of the sludge pressing rollers 5a and 5c are moved and the sludge pressing row 25' is rotated with the P cloth belts 1, 2, and 6 partially pressed together, the P cloth belts 1, 2, and 6 are rotated. runs in parallel in the counterclockwise direction in the drawing. Next, if the sludge S that has been subjected to appropriate pretreatment is supplied to the feed boxes 1 and 4c, the sludge S will be fed to the sawcloth belt 2, respectively.
and 6, and after gravity dewatering on the inclined part, the sludge on the 1 cloth belt 2 is sandwiched by the P cloth belts 2 and 1, and the sludge on the r cloth belt 6 is sandwiched by the 1 cloth belts 6 and 2, respectively. Pressed, sludge pressing roller 5a + 5c 15'
At this point, the water is dehydrated under pressure by the tension, moving tension, and shearing force of each r-fabric belt.

The dehydrated sludge (dehydrated cake) can be removed naturally or by using the scraper 7! It is peeled off from the 7F cloth belt and discharged out of the system. Each sawn cloth belt is cleaned by a cleaning nozzle 8 and circulated to feed boxes 4b and 4c.

In this way, the sludge is continuously dewatered.

In this case, at the start of the dewatering operation, each F cloth belt is partially crimped, but after the start of sludge supply, the rotating shaft of each sludge pressing roller is gradually moved, and the gap between each F cloth belt is set to a predetermined value. Set to . At this time, since the sludge that is being dehydrated is sandwiched between each of the F cloth belts, the R cloth belts 1 and 2 run parallel to the F cloth belt 3 due to the forced running of the P cloth belt 3.

It is preferable for the sawcloth belt 2 to have smooth surfaces on both sides, since this facilitates the peeling of the dehydrated cake, and it may be a two-layer belt with the front side (smooth side) facing the sludge side.

Furthermore, it is also effective to use a spacer as shown in FIG. 2. That is, in Fig. 2-1, 2a represents a spacer, 2b represents a dewatered and separated water outlet hole, and 2C represents a draining surface. It improves by a lot. therefore,
It is preferable to provide a similar outlet hole or outlet groove for each sludge pressing roller.

In addition, in the illustrated example, a total of three sludge pressing rollers per cloth roller 1 can be installed so that they run in parallel, or four or more rollers can be installed so that they run in parallel. may be attached to each sludge squeezing roller.

Furthermore, in the illustrated example, only the 8" I cloth belt 6 is forced to run by the sludge squeezing roller 5', or only the R cloth belt 1 is forced to run by the sludge squeezing roller 5a. Also, the f cloth belt 1.
It is also possible to force both of 3 to run.

6. Examples of the invention An example carried out using the illustrated apparatus will be shown.

Example 1 The sludge tested was mixed raw sewage sludge with a sludge concentration of 32 g/l. The sludge was tempered with the addition of 0.7% cationic polymer and subjected to testing. In both the conventional method and the present invention, the dehydration test was conducted with a saw cloth width of 0.5 m, a P cloth speed of 1 m/min, and a surface pressure of 0.4 kg f/l'd. As a result, the conventional method was 80%
kg/h, but the present invention has a processing capacity of 160 kg/h, which is twice the throughput of the conventional method, and the cake moisture content is 75.2 f)e for the conventional method, whereas the present invention uses 1 fabric belt and 2
The upper cake was 75.3q6, and the cake on the i' cloth belt 6 was 750q6, which was equivalent to the conventional method.

Example 1 The sludge to be tested was surplus human waste sludge with a sludge concentration of 22 g/l, and after being tempered with the addition of 1.596 cationic polymer, it was subjected to a test. Other conditions were the same as in Examples 1 and 2.

As a result, the throughput of the conventional method was 55 kg/b, whereas the amount of the present invention was 110 kg/b, which was the same as in Example 1.
Similarly, we were able to obtain twice as many treated nails as with the conventional method.

Furthermore, the water content was 81%, which was the same as that of the conventional method.

Functions and Effects of the Z Invention In the method of conveying sludge with an endless r cloth belt and pressurizing and dewatering it with a plurality of rotating rollers, conventionally, the f cloth has two upper and lower belts.
This method was the mainstream of conventional large-capacity treatment methods, with the use of a sludge roller and one sludge supply section, but in the device of the present invention, the installation space is almost the same as the conventional device, and the sludge squeezing roller is the same as that of the conventional device. With the same number of devices as the conventional device, a cake with the same moisture content as the conventional device can be obtained with more than twice the amount of sludge treated. It has the advantages of being able to process large volumes, has a simple device structure, and is easy to maintain and manage, and can fully meet the above-mentioned current demands.

[Brief explanation of drawings]

Fig. 1 is a flow sheet of the apparatus according to the embodiment of the present invention, and Fig. 2 is a longitudinal cross-sectional view of f fabric belt (2). 1.2.3...1 fabric belt, 2a... spacer, 2
b... Lead-out hole, 2C... 1 cloth surface, 4b, 4c...
Feed box, 5a, 5c, 5' - sludge pressing roller, 6a * 6br 6e... Guide roller, 7... Squeeze, 8... Washing nozzle. Patent applicant: Patent attorney representing Ebara Infilco Co., Ltd.
1) Minoru Maruyama (Mazuo)

Claims (1)

[Claims] 1. In a method of conveying sludge with an endless r-cloth belt and pressurizing and dewatering it with a plurality of rotating rollers, the belt is hung around a plurality of sludge squeezing rollers and can run in parallel.2. 1 cloth bell) (1), (5) 1 or 2 or more r
A cloth belt (2) is provided, and each of these cloth belts (1)
, (2)', (3) While supplying sludge to the gap,
At least one of the cloth belts (1) and (3) is forced to run, and the friction force of the sludge squeezed by these cloth belts (1) and (5) causes the cloth belt (2) to run. A sludge dewatering method characterized by dewatering the sludge. 2. An endless r-cloth belt in which sludge is conveyed by an endless r-cloth belt and dehydrated under pressure using a plurality of rotating rollers, at least one of which is forced to run)
(1) and (3) are hung on the sludge pressing roller; 2. One or more endless r cloths are hung on the idle roller so that the respective sludge pressing surfaces are separated from each other and face each other; A sludge dewatering device characterized in that a belt (2) is disposed such that a part of the belt (2) in the longitudinal direction is located in the separation gap between the sawcloth belts (1) and (S).