RU2480264C1 - Device for decreasing concentration of suspended matter in water treatment plant settler treated water - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to sewage treatment and may be used for cleaning sewage water from suspended matter. Proposed device comprises settler reservoir, water catch-and-discharge water channel with manifold arranged at spillway communicated with filters extending therefrom into reservoir filled with treated water. Said water catch-and-discharge water channel is divided by lengthwise wall into two channel, one for filtered water discharge and another one for unfiltered water discharge from overfilled settler reservoir. Optionally, device may incorporate filter air washing and unloading devices, flocculants storage and equipment for feeding the latter into manifold in filter air washing and unloading. Aforesaid manifold may be divided by vertical walls into separate sections.

EFFECT: higher quality of treatment.

4 cl, 1 dwg

Description

The invention relates to a device for wastewater treatment and can be used in public utilities at wastewater treatment plants from suspended solids.

Known filters for the purification of clarified water (N.N. Abramov. "Water Supply", Moscow: Stroyizdat, 1982) are installed in the form of reinforced concrete tanks rectangular in plan, connected by pipelines and special fittings to the corresponding settling tanks (USSR copyright certificate No. 1673160, class B21D 21/08, publ. 30.08.91).

The disadvantage of this structure in the large area of its development and the availability of additional communications for supplying clarified water from the sump to the filter.

Known sump with a downward-upward flow of liquid, containing a cylindrical body and a conical body, a baffle in the cylindrical part of the body, the feed tray of the waste water, gear spillway, a bowl for removing floating substances, a pipe for removing sludge under hydrostatic pressure, a collection tray of clarified sewage with a pipeline for the removal of clarified wastewater (USSR author's certificate No. 208552, class 85c 6/01, 6/08, publ. 29.12.67).

The disadvantage of this design is the constant descending-ascending velocity of the wastewater in the live section of the sump, as a result of which gravitational coagulation of floating and settling suspended solids due to the lack of a suspended layer occurs slowly.

The closest to the claimed technical essence and the achieved result is a secondary sedimentation device, which contains a tank with radial and annular weirs located inside it, moreover, annular weirs are installed coaxially to the reservoir. There is also a drainage by-pass chute, into which water purified in the sump is supplied through a drainage ring spillway (A.A. Aysaev et al. "Sewage disposal and treatment of St. Petersburg", St. Petersburg: Novyi Zhurnal, 2002, Fig. 65, p. .355, 356 - prototype).

A disadvantage of the known device is a high degree of concentration of suspended solids in purified sludge water due to:

- low intensity of sedimentation of suspended solids caused by the high speed of the laminar flow of purified water, initiated by the weir;

- lack of filtration of the purified sludge water going to the spillway.

An object of the invention is to improve the quality of wastewater treatment by reducing the concentration of suspended solids in the treated water of the sump of the treatment plant.

The stated technical problem is solved by using the design of the device to reduce the concentration of suspended solids in the treated water of the sump of the treatment plant containing the sump tank, a drainage drainage tray, into which the purified water in the sump enters through the spillway, in which according to the invention there is a collector with which filters connected from it to a reservoir filled with purified sludge water are connected, and the drainage by-pass tray is divided into two by a longitudinal partition and gutters, one of which serves to drain the filtered water entering it through the outlet pipes of the collector, and the other to drain unfiltered water from the sump tank in case of overflow.

In such a device:

- it may include equipment for purging or flushing the filters;

- the collector can be divided by vertical partitions into separate sections;

- it may include equipment for storing the flocculant and feeding it to the collector when purging or flushing the filters.

Such a device provides high quality cleaning by reducing the concentration of suspended solids in the purified water of the sump due to:

- use in the design of filters connected to the collector and departing from it into a reservoir filled with purified sludge water, which leads to an increase in the catchment area, a decrease in the rate of laminar flow of purified water, thereby increasing the rate of precipitation;

- the passage of purified sludge water through filters, ensuring its after-treatment.

The use of a drainage tray, separated by a longitudinal partition into two troughs, one of which serves to drain the filtered water entering it through the outlet pipes of the collector, and the other to drain unfiltered water from the sump tank, also improves the quality of cleaning purified water sludge, so as in the case of overflow of the sump tank, it enters the trench, which discharges unfiltered water, without mixing with the filtered water.

A possible purge or flush of filters in each section of the collector formed by vertical partitions can give stability and continuity to the technological process of water treatment of the sump.

The possible use of equipment for storing the flocculant and feeding it to the collector when purging or washing the filters can contribute to the intensification of sedimentation of suspended solids coagulated by the flocculant and to a decrease in their concentration in the purified water of the sump.

A comparative analysis of the claimed invention and the prototype reveals the distinctive features of the claimed device to reduce the concentration of suspended solids in the purified water of the sump of the treatment plant in comparison with the closest analogue, which allows us to conclude that the proposed solution meets the criteria of the invention of "novelty".

The presence of distinctive features makes it possible to obtain a positive effect, which consists in creating a new design of the device to reduce the concentration of suspended solids in the treated water of the sump of the treatment plant, which improves the quality of wastewater treatment.

Since when examining the subject of the invention in patent and scientific literature, no solutions were found containing the features of the claimed invention other than the prototype, it should be concluded that the claimed solution meets the criteria of the invention "significant differences".

The use of the claimed invention in the field of public utilities at wastewater treatment plants from suspended solids ensures the claimed invention meets the criterion of "industrial applicability".

The invention is illustrated by the drawing, which shows a General view of the device for reducing the concentration of suspended solids in the purified water of the sump of the treatment plant.

A device for reducing the concentration of suspended solids in the treated water of the settling tank of the treatment plant comprises a settling tank 1, a drainage drainage tray 2, into which purified water is collected in the settling tank, and collector 4 is located at the place of the weir 3, to which filters 5 connected to the collector are connected 4 into the tank 1, filled with purified water, and the drainage drainage tray 2 is divided by a longitudinal partition 6 into two troughs, one of which 7 serves to drain the filtered water entering it through reservoir outlet pipes 8, 9 and the other trough serves to drain unfiltered water from the tank 1 in case of the settler overflow.

The composition of such a device may include equipment for purging or washing the filters 5, as well as equipment for storing the flocculant and feeding it to the collector 4 when purging or washing the filters.

The collector 4 can be divided by vertical partitions into separate sections.

The decrease in the concentration of suspended solids in the purified sludge water of the sump is as follows.

In the process of sludge in the tank 1 of the sewage sump and sedimentation of part of suspended solids at its bottom, purified water passes through filters 5, thereby undergoing further purification from suspended solids by filtration. At the same time, substances trapped by the filter material settle on the outer surfaces of the walls of the filters 5. Filtered water passes through the internal channels of the filters 5 to the collector 4, from where it passes through the nozzles 8 into the groove 7 of the drainage tray 2.

Water from the reservoir 1 of the sump in the event of overflow enters the trough 9 of the drainage tray 2 to drain unfiltered water into the head of the treatment plant.

Filters 5 are made of filter material with low hydraulic resistance (100-150 mm water column), mainly of fiber-porous polyethylene or polypropylene. Each filter is made in the form of a hollow glass worn on the nozzle of the hole made in the manifold 2.

The presence in the composition of the device made in accordance with the invention of filters connected to the collector and extending from it to the sump tank filled with purified sludge water, through which water, bypassing the manifold nozzles, is fed into the chute to drain filtered water, resulting in a decrease in concentration suspended solids in purified sludge water of the sewage treatment plant.

The use of a drainage tray in such a device, divided by a longitudinal partition into two gutters, one of which serves to drain the filtered water entering it through the drain pipes of the collector, and the other to drain unfiltered water, also improves the quality of cleaning, as in the case of it overflows the sump tank or purges (or rinses) the filters, it enters the trench that discharges unfiltered water, without mixing with the filtered water.

The above structural features of the device lead to a significant reduction in the concentration of suspended solids in the purified sludge water of the sump of the treatment plant, which determines the significant positive differences of the claimed device from the prototype.

Claims (4)

1. A device for reducing the concentration of suspended solids in the treated water of the sump of the treatment plant, containing a sump tank, a drainage tray, into which the purified water in the sump enters through the spillway, characterized in that a collector is located at the site of the spillway, to which filters are discharged from it into a tank filled with purified sludge water, and the drainage drainage tray is divided by a longitudinal partition into two gutters, one of which serves to drain the filtered water entering the it through the outlet pipes of the collector, and the other to drain unfiltered water from the sump tank in case of overflow. 2. The device according to claim 1, characterized in that its composition includes equipment for purging or flushing the filters. 3. The device according to claim 2, characterized in that the collector is divided by vertical partitions into separate sections. 4. The device according to claim 1, characterized in that it includes equipment for storing the flocculant and supplying it to the collector when purging or flushing the filters.

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