SU1710514A1 - Sewage treatment device - Google Patents

Abstract

The invention relates to wastewater treatment by pressure flotation and can be used on ships in wastewater treatment plants. The purpose of the invention is to increase the efficiency of wastewater treatment by improving the hydraulic conditions for the formation of air bubbles, flotation complexes and their separation from water. The wastewater treatment unit comprises flotation chambers arranged in parallel and insulated from one another, which are connected by pipeline and are equipped with thin-layer elements and a baffle located below the thin-layer elements inclined to the bottom of the flotation chambers. The complexing agents are placed outside of each chamber, the lower part of which is connected to the coalescing agent, and the upper bases are made transitioning into expanding nozzles connecting these complexing agents to the flotation chambers between the submerged layer and the thin-layer elements. The wastewater supply pipe and the coalescer are connected to the set of components by forming tangentially and towards each other. Co-lescentors are fitted with cone-shaped inserts. 2 hp ff, 2 ill.

Description

The invention relates to the field of wastewater treatment by the method of pressure flotation and can be "used in various sectors of the national economy, for example, on ships in treatment plants. Wastewater.

A device is known which consists of a flotation chamber, inside of which a pipeline of purified water is placed, concentrically covered by a distribution chamber of a gas-saturated liquid. Insufficient water purification efficiency, which characterizes this device, is caused by the following reasons:

inadequate (using air bubbles due to a single collision of air bubbles with contaminants;

turbulization of the foam layer, its partial destruction and, accordingly, the shedding of soil particles into the purified water due to the release of purified and gas-saturated water perpendicular to the foam layer;

the impossibility of placing additional devices that intensify the process of water purification and increase the efficiency of removal of contaminants in the flotation chamber.

The closest to the technical solution of the present invention is a multi-chamber flotation device consisting of a tank divided by pair partitions into a series of successively alternating mixing and flotation chambers, with perforated pipes in the mixing chambers for distributing gas-saturated water, improving the quality of wastewater treatment in the specified the device is provided by the fractional supply of gas-saturated liquid to the flotation cell.

However, this design solution also has a number of drawbacks leading to incomplete wastewater treatment:

the absence of a uniform distribution of air bubbles in the volume of water being purified, since the gas-saturated water is supplied to the mixing chamber discretely along the length of the latter by means of perforated pipes;

the impossibility of ensuring a reliable collision and firm adhesion of soil particles to air bubbles discharged from a perforated pipe, due to the fact that the curtain consists of one layer of air bubbles, and their penetration between the soil particles is possible; the possibility of destruction of flotation complexes, due to the fact that the mixture of gas-saturated and purified water is supplied to the lower zone of the flotation chamber, which lengthens the path of transporting flotation complexes to the foam layer and increases the causes of their destruction, as well as Teivf, which froth the froth layer of water.

The aim of the invention is to increase the efficiency of wastewater treatment by improving the hydraulic conditions for the formation of air bubbles, flotation complexes and their separation from water.

The goal is achieved by the fact that the flotation chambers are made isolated from each other, are arranged in parallel, are connected by pipeline and are equipped with thin-layer elements and a baffle, the device is equipped with coalescing agents and complexing agents installed in front of each flotation chamber the expanding nozzle, connected to the flotation chambers between the foam layer and thin-layer elements, and the waste water supply pipe and the tanga coalescentors cially connected to the lower part of the complexants and directed towards each other. In addition, the partition wall is located below the thin-layer elements with an inclination to the bottom of the flotation chamber, and the coalescentors are provided with cone-shaped inserts.

Such a constructive implementation of the flotation chambers ensures consistent (staged) contact of contaminant particles that are not eroded in the previous flotation chamber with newly formed air bubbles and thereby ensures the removal of contaminant particles (in each subsequent step) with less hydrophobicity

5 (hardly floatable) and the most complete use of dissolved air, which increases the degree of water purification and, therefore, eno, the cleaning efficiency.

Introduction of complexing agents in

This device provides repeated collisions of air bubbles with particles of contaminants, contributing to the formation of viable flotation complexes and, consequently, cleaning efficiency. Placing complexing agents in front of each flotation chamber improves the hydraulic conditions for separating the smallest flotation complexes from waste water by placing additional devices inside the flotation chambers that intensify this process, for example thin-layer elements and a baffle, which ultimately increases the cleaning efficiency

5 In addition, the implementation of the upper part of the complexing agents in the form of an expanding nozzle and the connection of the latter with the flotation chambers between the foam layer and the thin-layer elements provides

0 uniform distribution of the liquid throughout the entire volume of the flotation chambers, reduces the way the flotation complexes float into the foam layer and thereby eliminates the possibility of destruction of the flotation complexes and

5 prevents particles of contaminants and, consequently, secondary pollution of purified water from falling out of the foam layer into the purified water, which also increases the efficiency of water purification.

0 Introduction to the device of coalescentors and the supply of the latter with cone-shaped inserts will provide a favorable hydraulic mode for the formation of air bubbles (due to an increase in the surface mass transfer), the dimensions of which satisfy the conditions for the transport of soil particles, which allows more complete use of dissolved air and therefore, it increases the degree of water purification and reduces the energy consumption for the preparation of gas-saturated liquid. Connecting the sewage supply pipe and coalescentors to the lower part of complexing agents tangentially and towards each other increases the degree of mixing of the mixture (waste and gas-saturated water) and provides multiple collisions of air bubbles with soil particles, increasing the number of strong viable flotation complexes formed, which also improves the efficiency of water purification from contamination.

FIG. 1 shows a wastewater treatment device, general view; in fig. 2, section A-A in FIG. one,

The wastewater treatment device comprises a tank within which two flotation chambers 1 and 2 are connected parallel and isolated from each other by pipe 3, pipe 4 for supplying waste water, pipe 5 for supplying gas-saturated water and pipe 6 for discharging purified water. Flotation chambers 1 and 2 are equipped with thin-layer elements 7 (to intensify the process of separating the smallest flotation complexes from water) and a baffle 8 (to more fully utilize the volume of chambers 1 and 2), which is located below said elements 7 with a slope to the bottom of the flotation chambers 1 and 2. Before each flotation chamber 1 and 2, complexing agents 9 and 10 were installed, with the upper part made in the form of an expanding nozzle 11 and 12 connected to chambers 1 and 2.

The lower parts of the hulls of complex-forming agents 9 and 10 are connected tangentially to the coalescer 13 and 14 and the pipes 4 and 3, while the coalescentors 13 and 14 and the tubes 3 and 4, respectively, are directed towards each other. The coalescentors 13 and 14 are provided with inserts 15, conical in shape.

The wastewater treatment device operates as follows.

In complexing agent 9, waste water is supplied through pipe 4, and pb pipe 5 and through coalescentor 13, gas-saturated water is supplied. In the coalescer 13, the gas-saturated water, in contact with the inserts 15, is stirred, and the air bubbles coalesce, coarsen, and reach flotation sizes. Received in. complexing agent 9 mixture (fleet complexes and waste water) through nozzle 11-. steps into the flotation chamber 1, evenly distributed over the area of the latter. Air bubbles with adhering soil particles (viable float complexes) float into the substrate and are removed from the flotation cell 1.

A mixture containing smaller flotation complexes passes through thin-layer elements 7, while flotation complexes on the surface of the plates of the latter stick together, and those that have reached flotation size float to the foam layer, and semi-purified waste water, bending around the guide wall 8, is discharged through the connecting pipe 3 into the complexing agent 10. In the latter, semi-purified water is mixed with gas-saturated water, which enters through pipe 5 through a coalescentor 14. The newly obtained mixture (flotation complexes and semi-purified water) through the nozzle 12 enters the flotation chamber 2, being distributed evenly over the area of the latter, and undergoes additional treatment according to the scheme described above. Purified water is discharged from the flotation chamber 2 through pipe 6.

The effectiveness of the invention is the rational and more efficient (full) use of dissolved air released from gas-saturated water, the formation of a large number of durable flotation complexes, their unimpeded floatation into the foam layer, the uniform distribution of water over the area and in the volume of flotation chambers due to improved hydraulic conditions in the respective device structures.

Claims (1)

Invention Formula 1. A wastewater treatment device containing a reservoir within which flotation chambers, wastewater and gas-saturated water supply pipes and purified water discharge pipes are located, characterized in that, in order to increase the efficiency of wastewater treatment by improving the hydraulic conditions for the formation of air bubbles , flotation complexes and their separation from water, the flotation chambers are made isolated from each other, arranged in parallel, connected by means of a pipeline and equipped with thin-layer elements and a guide it is partitioned with a device equipped with coalescentors and complexing agents installed in front of each flotation chamber, the latter with an upper part made as an expanding nozzle connected to the flotation chambers between the foam layer and thin-layer elements, and the wastewater supply pipe and coalescentors are tangentially connected to the lower part of complexing agents and directed towards each other. 2, the device pop. 1, characterized in that the guide wall located below the thin-layer elements with a slope to the bottom of the flotation chamber. I 3. The device according to claim 1, that is, the fact that the coalescentors are equipped with cone-shaped inserts.