SU1757706A1 - Settler - Google Patents

Abstract

SUMMARY OF THE INVENTION: A sump contains a reservoir with units for supplying and discharging water. Horizontally placed one above the other conveyor belts form the cleaning chamber. Sediment collections are made in the form of slot-hole pipes located at the ends of the conveyors with hinged plates on them. Sludge collectors are connected to a vacuum sludge thickener by pipelines. 1 il.

Description

The invention relates to wastewater treatment plants and can be used in primary and secondary clarification tanks.

A well is known a sump containing steeply inclined plates located in a tank with inlet and outlets of condensed sediment and clarified water.

The drawbacks of such a settling tank are associated with poor cleaning quality, as well as with high specific costs for construction and operation.

Also known is a settling tank containing a reservoir with nodes for supplying source water and discharging clarified water, horizontally placed one above the other belt conveyors to form cleaning chambers.

In the well-known vr OTHeHUbiu sedimentation tank, sediment on conveyor belts is stirred up before being removed from the sedimentation tank, resulting in a decrease in the concentration of suspended particles in water, which leads to a significant increase in the cost of subsequent sludge treatment technology and a decrease in purification quality.

The purpose of the invention is to improve the quality of wastewater treatment while reducing the cost of treatment.

The goal is achieved by the fact that the settling tank is equipped with a vacuum sludge thickener located above the tank and pipelines connected to it with sludge collectors made in the form of slotted tubes with plates hinged to them forming a slotted nozzle with a belt conveyor perforated pipes with valves and fittings located on diametrically opposite walls of the tank in each chamber, and sludge collectors are located at the ends of flax accurate conveyors from the clarified water outlet.

The drawing shows a sump, longitudinal section.

The sump contains a tank 1 with a supply of 2 source water and a discharge of 3 clarified With

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01 vj About About

Lenna water In the tank one above the other are belt conveyors 4 and

5, at the end in the course of movement of which there are sediment removers from the ribbons consisting of the sediment collector 6 and plates 7 and 8 attached to it through the hinges at the top and bottom, respectively, and the collectors through pipelines 9 and 10 are connected to the vacuum sludge thickener 11. the ends of the tank are dispensing pipelines with shut-off and control valves 12 and 13, connected to perforated pipes 14 and 15, and precast pipelines with shut-off and control valves 16 and 17, connected to another group of perforated pipes 18 and 19. Plates 7 and 8 sediment collectors at the ends have seals 20 and 21. The vacuum sludge thickener is supplied with pipelines 22 and 23 of circulating sludge and excess sludge, as well as with pipeline 24 of clarified water connected by a second side to the main outlet 3 of clarified water, and a vacuum pump 25

The sump works as follows.

Source water is introduced into reservoir 1 through inlet 2, which through distributing pipes with shut-off and control valves 12 and 13, as well as perforated pipes 14 and 15, is distributed evenly throughout the depth of the reservoir. Conveyor belts 4 and 5 are moved in the direction of water movement at an equivalent speed — to optimize the modes of movement of the sludge in the direction of its collections. Collections perform a triple purpose — the spring-loaded plate 7 removes all sediment from the belt by lightly pressing it onto the tape, and the top plate 8 ensures that the entire layer is sucked into the collection, and with minimal dilution with water. For this, the top plate is made in the form of an element that forms an asymmetrical sediment collecting nozzle with a tape, the input part of which has a narrowing shape in the direction of flow and the sediment 6 facing the collector 6 is expanding. This ensures the presence of low speeds in the intake port - to reduce the moisture content of the sludge, high speeds in the central part of the device - to suck all the compacted sludge into the collection

6, reducing the speeds in front of the collection itself b - to optimize the hydraulic modes in it.

From collector 6, due to the presence of negative pressure in the vacuum thickener 11 created by the vacuum pump 25, the sediment rises up into this thickener,

where additional sludge dewatering takes place due to the following additional process. As pressure decreases, gas bubbles are also released from the bound water in the suspended particles structure, thereby drastically reducing the density of these particles, as a result of which from water, concentrating in the zone above the surface of the water in the thickener

To prevent the source water from being filtered, in the zone of the ends of the plates 7 and 8 between the plates and the side walls of the tank 1 elastic seals 20 and 21 are placed, which makes it possible to reduce the size of the thickener and the power of the vacuum pump,

Top plate 8 of sludge collector

works in automatic mode - as the layer of sediment on the conveyor belt increases, the opening angle of this plate increases.

Conveyors with a sludge removal system can be mounted in a fixed scheme with a rigid attachment to the walls of the tank or in a fast-mounted scheme allowing all additional elements to be assembled into a single structure.

outside the sump and then lower it to the top of the tank. In the latter case, the assembly and disassembly during the reconstruction of the settling tanks can also be carried out without draining them.

The proposed settling tank allows to improve the quality of cleaning, reduce its consumption of materials and cost.

Claims (1)

Invention Formula A sump containing a reservoir with nodes supplying the source water and discharging the clarified water, horizontally placed one above the other belt conveyors to form cleaning chambers characterized in that, in order to improve the quality of purification, it is equipped with a vacuum sludge thickener located above the reservoir and pipelines connected to it with sludge collectors, made in the form of slotted pipes with hinge plates fixed on them, forming a slot-hole nozzle with a belt conveyor, with the water inlet and outlet units made in the form of perforated pipes with shut-off and control valves located on diametrically opposite walls of the tank in each chamber; Sludge collections are located at the ends of belt conveyors on the clear water outlet side. I