SU1556709A2 - Clarifier - Google Patents

Abstract

The invention relates to water supply and can be used for the preparation of drinking and industrial water by gravitational sedimentation of suspended solids in water. The purpose of the invention is to improve the quality of purification of the source water while reducing the dose of coagulant for its treatment. The clarifier contains a reservoir with a central flocking chamber (CC) of trapezoidal shape in cross section with a large base at the bottom. The air distribution system is located in the lower part of the farm, and the water supply system is located in the upper part. Thin-layer modules are installed between the walls of the tank and the side walls of the farm, and above them is a system for collecting clarified water. Under the water supply system, an additional air distribution system is installed, made in the form of filter elements of a porous material. Due to the mixing of air bubbles moving towards the water flow, in the upper part of the CC the intensive coagulum mixes with the treated water, as well as a more uniform distribution of water over the CC square. In addition, the use of fine-bubble outflow of air in a counter-current mode makes it possible to effectively release excess carbon dioxide from the water. 1 il.

Description

The invention relates to water supply and can be used for the preparation of drinking and industrial water by gravitational sedimentation of suspended substances of mineral and organic origin in water.

The purpose of the invention is to improve the quality of purification of the source water while reducing the coagulant dose for treatment.

The drawing shows a clarifier, a general view.

The clarifier contains a tank 1 with a flocculation chamber 2 centrally located in it, which has a trapezoidal shape in cross section with a large base at the bottom. Thus, the cross section of the flocculation chamber 2 gradually increases in the direction of water movement. The lower part 3 of the side walls 4 of the chamber 2 of the flocculation is bent inward of the chamber and encompasses the air distribution system 5. At the top of the chamber 2 the flocculation

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There is a water supply system 6. Between the walls of the tank 1 and the side walls 4 of the chamber 2 of the flocculation, thin-layer modules 7 are installed, and above them the system 8 of collecting clarified water. Thin-layer modules 7 are made in the form of an asymmetric confuser with a living section gradually expanding towards the exit. A pressure system 9 is located near the bottom of the tank 1 to remove sludge.

Under the water supply system of the mouth, an additional air distribution system, made in the form of filter elements 10 of a porous material, is added.

The clarifier works as follows.

The source water through system 6 is supplied to the flocculation chamber 2. Air is supplied through the air distribution system 5 and the filtering elements 10 towards the water flow. Due to the mixing of air bubbles emerging from the filter elements 10 in the upper part of the chamber 2 flocculation, intensive mixing of the coagulant with the treated water occurs, as well as more uniform distribution of water over the chamber area. In addition, the fine bubble outflow of air allows for the efficient removal of excess carbon dioxide from the water. Air bubbles emanating from the air distribution system 5 agitate the water, in the lower part of the chamber 2 flakes form. Such mixing, together with an increase in the direction of movement of the water of the living section of chamber 2, leads to the formation of large flakes, some of which fall to the bottom of the settler directly under the chamber. Further, the flow is rotated 180, falls into the inter-shelf space of the thin-layer modules 7.

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In this case, the vortex-forming flow separation zone when flowing around the lower part 3 of the side walls 4 is localized outside the entrance to the thin-layer modules 7.

Pass the thin layer modules 7, the purified water is collected by the collection system 8. Suspended substances deposited in the inter-shelf spaces of the thin-layer modules 7, slide along the shelves and accumulate in the lower part of the prismatic bottom of the tank 1, then are removed at. assisted pressure sludge removal system 9. Due to mixing by air bubbles moving towards the flow of water, intensive mixing of the coagulum with the treated water occurs in the upper part of the chamber, as well as more uniform distribution of water throughout the chamber. In addition, the use of fine-bubble outflow of air in counter-current mode by increasing the mass transfer coefficient makes it possible to effectively remove excess carbon dioxide from the water. I

A flocculation chamber with a counter-movement of air and treated water in combination with its variable cross-section allows to obtain denser, larger flakes with smaller doses of coagulant.

Claims (1)

Invention Formula Clarifier auth. St. JP 1435268, distinguished by the fact that, in order to improve the quality of water purification while reducing the dose of coagulum, it is equipped with an additional air distribution system made in the form of filter elements of porous material placed in the upper part of the flocculation chamber under the source water supply system. eight