SU1331839A1 - Vertical filter of drainage system ,particularly, of sludge site - Google Patents

Abstract

The invention relates to sludge dewatering devices for sewage treatment plants - sludge beds. The purpose of the invention is to intensify the process of sludge dewatering, reduce energy intensity, improve the conditions for mechanized sludge harvesting, filter cleaning and eliminate manual labor. Filters installed in niches of walls of sludge L 22sl 21 Figure 1

Description

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The platforms, consisting of sections, provide layer-by-layer dewatering of the sediment with a separate separation of liquid from each layer. The design of the filtering elements provides for independent rinsing of sections with a reverse flow of liquid and flushing of contaminants on the outer surface with a stream of water under pressure. During the filtration process, the element is closed by cap 22.

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The invention relates to devices for the disposal of sewage sludge and can be used in sewage treatment plants.

The purpose of the invention is to increase the efficiency of using the filter by reusing it without dismantling it and by controlling the removal of the filtrate from different levels.

FIG. 1 shows a silo pad, plan} in FIG. 2 is a vertical filter element, a section j in FIG. 3 shows section A-A in FIG. 2,

The silt pad with a waterproof base 1, fenced with walls 2, has a niche 3 symmetrically located relative to the longitudinal axis of the pad, in which vertical filter elements 4 are installed, pairwise connected by a drainage pipe 5 and through valves 6 and 7 with a flush pipe 8 and a discharge manifold 9 filtrate. Moreover, the filtrate drain collector through the valve 10 and the hydraulic lock is connected to the drainage pipe 11 of the lower drainage system located at the base of the 1 sludge bed. In parallel with this pipe, a pipe 5 of the filtrate was laid.

The silt site with filtering elements allows all the work to be carried out mechanically, for which crane girders 12 are equipped with crane girders and a bridge unit 13 equipped with working bodies for treating sewage sludge is moved along them. For arrival

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with hydraulic cylinder 16 installed inside the filter. The device is easy to maintain, compact, since the pipelines for supplying the washing liquid and draining the filtrate are not in contact with the sediment, but are attached to its base. The proposed device, a silt pad, can be used for dewatering suspensions, 3 sludge.

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machines when they are loaded on the sludge platform ramp 14,

The vertical filter element (Fig. 2) consists of a set of filter sections, which are sealed with each other by gaskets 15 and mounted on base 1. Inside the set of sections a hydraulic cylinder 16 is installed, the stem 17 of which is attached to the base and has openings 18 and 19 extending respectively in the lower and upper parts of the piston for supplying (draining) fluid in the cavities 20 and 21, the upper end of the cylinder is attached to the roof of the cap 22, at the base of which there is a tangential nozzle with a check valve that opens when the filtrate is pressed and flush water, and a pipe 24 for supplying and discharging liquid into the cavity 25 when flushing the filter element. The sections of the filtering element are made in the form of a two-layer cylinder with a perforated outer wall 26, closed by a grid 27, capable of holding the pressure of the liquid during back-flushing. Between the inner 28 and outer 26 walls of each section there is a system of perforated and solid tubes 29, the number of which is equal to the number of sections forming channels for separate separation of sections for separate removal of the filtrate from each section or for the flushing liquid. The perforated tubes 29 are closed with a net 30 holding the filter media (for example, sand) in the cavity. Top holes of the system

tubes 29 are plugged. The tubes are threaded and together with the nuts 31

are all sections. In the central part; The stem has an opening 32 in which there is a movable pipe 33 with a piston part having seals 34 for supplying the flushing fluid to the pipeline 35, and then to the annular manifold 36 on the cap. The flushing fluid is supplied from the annular collector through the openings 37 in the cap wall. The number of collectors 36 is selected depending on the degree of collation of the filter and the ability of the sediment to form a strong crust during drying and on the stroke of the hood. If the cap stroke is equal to the height of one section, then the number of collectors is equal to the number of sections and the distance between them is equal to the distance between sections.

Ilova site works as follows.

The pad is filled with the caps 22 lowered and with simultaneous supply of process water through the tubes 29 under the cap. After stratification of the sediment, caps 22 rise to a level that prevents the upper layer of sediment from contacting the surface of the filter element. This precaution is due to the fact that the upper layer contains many fats, which as the level decreases can cover the entire surface of the filter with a film. At the same time, the level of technical water under the hood is the same in height as the height of the sludge on the site; incomplete lifting of the caps is also necessary because the wetted surface of the filter element with air may cause a hard-to-remove crust to form on its surface. drying of sediment

After lifting the caps, 45 as the volume decreases, the opening of the valves 6 and 7, which regulate the rate of drainage of the filtrate from the various sections in height, decreases. The rate of removal of the filtrate is limited only at the boundary of the filtration section with a compacted precipitate. Here it is necessary to create such a rate of removal of the filtrate so that there is no detachment of particles from the compacted sludge.

In the event of severe clogging of the filter elements (including until the end of the dewatering process), they are washed. For this, caps are lowered into cavity 25 of

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depending on the climatic conditions. Therefore, the processing cycle of one-time filling of the sludge bed is 10-15 days, i.e. the productivity of the sludge bed rises tenfold compared to the known ones.

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about rmu l and

the invention

The vertical filter of the drainage pipe is predominantly a sludge bed that is installed on the base5

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The pipe 24 is supplied with a liquid that washes away the sediment layer from the outer surface of the filtrate.

When the filtering surfaces of the lower sections are heavily clogged, flushing is first conducted through a collector 36 connected to the wash water supply pipe during reciprocating movement of the cap 22, the stroke of the cap is associated with the height of the broken filter surface and can vary gradually depending on the stroke washing process.

After washing the cavity under the hood, the filter elements are washed with a reverse flow of fluid, which flows through the tubes 29 to each section. The caps are then raised to the desired level and the dewatering process continues.

How. as soon as the dewatering process is completed, the caps are lowered and the washing of the filter elements in the described order begins.

After the free water has been withdrawn through the vertical filter elements located in the niches, the valve 10 is opened, and the free water of the compacted lower sediment is drained through the lower drainage.

As a result of the final removal of free water from the sediment, its volume will be reduced by 3-5 times, the humidity g becomes equal to 80-90%. Further treatment of the sludge on the sludge bed in order to dewater it is carried out in a mechanized way.

The sludge is loaded into a vehicle by a bridging unit using, for example, an elevator (rotary) type working body. Drying the sediment to a moisture content of less than 80% is impractical, so

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depending on the climatic conditions. Therefore, the processing cycle of a single filling of the sludge bed is 10-15 days, i.e. the productivity of the sludge bed increases tenfold compared with the known.

55

about rmu l and

the invention

The vertical filter of the drainage system is predominantly a sludge bed, containing a filtering surface installed on the basis of the RIA, a coaxial hood installed with a drive mechanism, filtrate drainage pipes and technical and flushing fluid, characterized in that I, in order to increase the efficiency by using multiple use without dismantling it and due to controlled removal of the filtrate from different levels, the filtering surface is made of

a collector located in its lower part and having openings directed to the filtering sections, and a tangentially located branch pipe with a non-return valve for draining the washing liquid, the cap drive mechanism is designed as a hydraulic cylinder section located inside the filter sections consisting of a rod mounted on the base of the filter and movable pipe with a piston attached to the arch of the cap, while the movable pipe of the hydraulic cylinder connecting sections with perforated

tubes for removal of the filtrate and supplied with the supply pipe of the technical flushing liquid, the liquid and the liquid and the collar are equipped with an annular flush bottom flush collector of the cap.

a collector located in its lower part and having openings directed to the filtering sections, and a tangentially located branch pipe with a non-return valve for draining the washing liquid, the cap drive mechanism is designed as a hydraulic cylinder section located inside the filter sections consisting of a rod mounted on the base of the filter and a movable tube with a piston attached to the arch of the cap, while the movable tube of the hydraulic cylinder connect

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Editor O. Yurkovetska

Compiled by A. Gaidar

Tehred M. Khodanich Proofreader A.T.

Order 3765/21 Circulation 850 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

Fig.Z

Claims (1)

Claim A vertical filter of the drainage system of a predominantly sludge platform, containing a filter surface mounted on the base 55, a cap coaxially mounted with a drive mechanism, filtrate discharge pipes and technical and fluid flushing pipelines, characterized in that, in order to increase the efficiency of use due to the provision of repeated use without its dismantling and due to the controlled removal of the filtrate from different levels, the filter surface is made of filter sections with perforated with tubes for draining the filtrate and supplying technically flushing fluid, the cap is equipped with an annular flushing manifold located in its lower part and having openings directed to the filter sections, and 5 a tangentially located pipe with a check valve for draining the flushing fluid, the cap drive mechanism is made in the form a hydraulic cylinder located inside the filter sections, consisting of a rod fixed to the filter base and a movable pipe with a piston attached to the dome of the cap, while the movable pipe The hydraulic cylinder is connected to a yen of technical and flushing fluid and a flush cap collector. Figure 1 Aa Fig.Z