SU1725958A1 - Settling tank for cleaning water - Google Patents

Abstract

The invention relates to water and wastewater treatment plants, namely to the purification of thin-layer elements from deposits. The aim of the invention is to improve the cleaning efficiency and performance of the device. The sump for water purification contains a bell with an open bottom part with a mechanical seal, in the cavity of which there is a cylindrical chamber with radial holes, equipped with a pipe for supplying compressed air, an elastic shell attached to the chamber and forming an annular variable volume chamber with it, a slurry pipe with a pulp distributor, mounted around the perimeter of the bell section, associated with its cavity by radial channels. The bell is mounted on the ends of the thin-layer elements of the water purification facility. 2 Il.

Description

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The invention relates to the treatment of water and wastewater, in particular, to devices for washing thin-film elements from deposits.

In the practice of operating thin-layer, settling tanks, a hydro-impulse jet cleaning device containing a supply pipe (rubber hose) with a tip is currently used. The cleaning of channels of thin-layer elements from mechanical deposits is done manually. The water jet tip is moved along the ends of the thin layer elements, introduced into each channel of the thin layer module, and the sediment is washed off.

A septic tank for wastewater treatment is known, comprising a housing, a package of thin-layer elements with a means for cleaning them, made in the form of a bell with an open bottom part with a mechanical seal, and a slurry pipeline. As a result of the vacuum created in the bell, the means for cleaning thin-film elements works as a suction device.

The drawback of the device is a relatively small increase in the energy of the wash stream, which is not sufficiently effective for cleaning the surface and regenerating thin-layer elements, which reduces the performance of the device and the efficiency of water purification.

The aim of the invention is to improve the performance and efficiency of water purification.

This goal is achieved by the fact that in a settling tank for water purification, comprising a housing, a package of thin-layer elements with a means for cleaning them, made in the form of a bell with an open bottom part with a mechanical seal and a slurry pipeline.

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nozzles for introducing source water and withdrawing clarified water and sediment; the means for cleaning thin-layer elements is provided with a cylindrical chamber located at the axis of the bell with radial holes on the lateral surface, a nozzle for supplying compressed air and an elastic shell fixed on the cylindrical chamber with the formation of an annular chamber variable volume having an air duct, while the slurry pipeline is equipped with an annular distributor in communication with the bell by means of radial channels located along the perimeter The lower floor of the bell.

Due to the fact that the compressed air is enclosed in an elastic chamber of variable volume, does not mix and does not dissolve in the source and clarified water, the stability of the hydrodynamic regime in the catchment compartment is not disturbed. A multiple increase in the productivity and efficiency of cleaning the internal surfaces of the channels of thin-layer elements is achieved by introducing into the stream of washing water an abrasive material — fine sand or silt.

The cleaning process can be adjusted to the full extent of the thin-layer elements and the speed of the reciprocating movement of the abrasive-containing liquid in the channels of the thin-layer elements by controlling the supply and collection of compressed air in the variable volume chamber and changing the amplitude and frequency of the elastic chamber oscillations.

Fig. 1 shows schematically a sump for water purification, a general view; in fig. 2 - a means for cleaning the channels of thin-layer elements, a general view.

The sump includes a housing 1, a package of thin-layer elements 2, a means 3 for cleaning them, nozzles 4-6 for introducing raw water, withdrawing clarified water and draining sediment, respectively. The means for cleaning the thin-layer elements 3 is made in the form of a bell 7 with an open bottom part with an end seal 8. In the bell 7 there is a cylindrical chamber 9 with radial holes 10, equipped with a pipe 11 for supplying compressed air. On the chamber 9, an elastic shell 12 is fixed, forming with it an annular chamber 13 of variable volume. The chamber 13 is provided with an air vent 14 for discharging compressed air. The cleaning agent is provided with a slurry line 15 with an annular pulp distributor 16 connected to the cavity of the bell 7 by radial channels 17. The bell 7 is mounted on the ends of the thin-layer elements 2.

The sump works as follows.

The source water through the inlet nozzle 4 enters the cavity of the housing 1 and passes from the bottom upwards through the inclined thin-layer elements 2. The clarified water is directed to the nozzle 5, and the sediment

0 slides along the inclined elements into the system 6 of sediment removal. When the sediment moves along the inclined plates 2, part of it settles on the plates and as the sediment accumulates, the channels of the thin 5-layer elements need to be cleaned.

To clean the channels of the thin-layer elements, compressed air is fed into the chamber 9, the pressure in it increases until the dilution device is blown up (not shown). With

0, compressed air exhaust through the openings 10 into the variable volume chamber 13 expands the elastic shell 12. This excites a pressure wave in the fluid within the cavity of the bell 7 and the hydraulic flow moves through the open bottom and channels of the thin-layer elements 2. The exhaust air is discharged through the air outlet 14. Through the pipeline 15 serves the pulp, including sand, which

0 through the distributor 16 and the channels 17 enters the cavity of the clocra 7 and mixes with the liquid. With an increase in the volume of chamber 13, the abrasive-containing liquid moves at high speed along the channels of the thin-layer elements 2 and, having an effect on the deposits, cleans their surface.

With an increase in the amplitude of oscillations, the length of the path of the fluid in the channels increases 0 sec and they are cleaned to a great depth. When dropping the waste air and reducing the volume of the chamber 13, the pressure in the cavity of the bell 7 decreases and the pulp-containing liquid from it rises.

5 channels of thin-layer elements 2 and part of the pulp from the distributor 16 through the radial channels 17. After the next portion of compressed air is supplied to the chamber 9, the process is repeated.

0 First, they work with a larger amplitude of oscillations of the elastic shell 12 and a small frequency of oscillations. After replacing water in the entire volume of the cavity of the channels of thin-layer elements 2 amplitude

5 reduce and increase the frequency of oscillations.

Thus, short-term overpressures formed in the bell act on the surface of thin-layer elements in a pulsed mode.

press, vibrations and vibrations cause them, which also increases the cleaning efficiency.

Effective cleaning of the channels of thin-layer elements helps to improve the performance of the sump and the quality of water treatment. Manual labor is excluded when washing thin-layer elements.

Claims (1)

DETAILED DESCRIPTION OF THE INVENTION A settling tank for water purification, comprising a housing, a package of thin-layer elements with a means for cleaning them, made in the form of a bell with an open bottom part with a mechanical seal and slurry conduit, feed water inlets and outlets Yes, clarified water and sediment, characterized in that, in order to improve the performance and efficiency of water purification, the means for cleaning thin-layer elements is provided with a cylindrical chamber located along the bell axis with radial holes on the side surface, a pipe for supplying compressed air and an elastic shell fixed on a cylindrical chamber with the formation of an annular chamber of variable volume with it, which has a vent, while the slurry pipe is equipped with an annular distributor in communication with the bell scrap by radial channels located along the perimeter of the lower part of the bell. W.1 FIG. 2