SU1747388A1 - Device for flotation cleaning of sewage - Google Patents

Abstract

SUMMARY OF THE INVENTION: The device comprises a cylindrical container, nozzles for input and output of purified water. In order to prevent the foam from collapsing and to reduce its residence time in the device, it contains a coaxially installed discharge pipe through which the foam is discharged, while the nozzle for entering the treated water is located tangentially in the upper receiving chamber of the installation body. 2 Il.

Description

The invention relates to devices for the flotation treatment of wastewater and can be used in the pulp and paper, oil refining, chemical industries, oil and fat plants. soap factories and other enterprises where it is necessary to purify wastewater from emulsion, colloidal and suspended substances.

Many flotation apparatus for sewage treatment with various foam collectors are known, but all of them are equipped with mechanical moving parts, which to a greater or lesser extent destroy the foam layer. An exception is the device where mechanical scrapers are replaced by a vacuum barometric tube.

A disadvantage of the known device is that from the moment of separation from water to entering the vacuum foam pipe the foam travels a long way, determined by the length of the flotation cell, while the lower boundary of the foam layer undergoes partial destruction by streams of clarified water.

In addition, at the walls of the flotation cell, due to the greater resistance, the foam product condenses so much that it must be washed out with water, which leads to disruption of the hydrodynamics of the process and deterioration of the quality of clarified water. This design does not allow to adjust the level of the foam layer intake, which, with an increase in the supply of purified water, leads to its penetration into the vacuum tube and dilution of the foam product.

Closest to the present invention is a device for flotation sewage treatment, containing a cylindrical tank with a tangential inlet, a nozzle for withdrawal, purified water and a coaxially installed discharge pipe.

However, the circulating streams formed in the hydrocyclone destroy the lower layers of the frothy product and a significant part of the fine fraction, which does not enter the collection funnel, is carried out with clarified water (L

WITH

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with

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mi The disadvantage of this method is the complexity of the design, which reduces the effective volume of the cylindrical chamber.

The aim of the invention is to increase the efficiency of wastewater treatment by preventing the destruction of the wastewater and reducing its residence time in the device.

This goal is achieved by the fact that the device contains a cylindrical tank, nozzles for introducing the treated water, a central discharge pipe installed coaxially, and a nozzle for introducing the purified water is located tangentially in the upper part of the receiving chamber.

In the proposed device, the collection of foam product takes place due to the creation of rotational motion of lena with the formation of a funnel, in which, under the action of centrifugal forces and the difference in density of purified water and froth product, radial transfer of foam occurs to the center of a coaxially installed central collection pipe. gravity discharge.

All this helps to prevent the destruction of the foam and reduce the time of its arrival, which allows to increase the efficiency of wastewater treatment.

Figure 1 shows the proposed device, a General view; figure 2 is the same, top view.

The flotation device contains a cylindrical tank 1 with a receiving chamber 2 in the upper part. An inlet nozzle 3 is tangentially positioned to supply the water to be purified in the receiving chamber 2. A central discharge is installed in the tank below the inlet nozzle.

pipe 4 for removal of the floated particles.

The device works as follows.

Purified water with dissolved in it

air under pressure is discharged into the receiving chamber 2. Due to the tangential wate, the air-water mixture formed during flotation twists and forms a funnel. Under the action of centrifugal forces, the floated foam product rushes to the center of the flotation cell 1 and is removed by gravity through the discharge pipe 4, the clarified water is discharged

P the bottom of the flotation cell 1.

When using the proposed design, the collection of foam product occurs without any mechanical moving units and without forced vacuum, which prevents its destruction, shortens the residence time in the device and, as a result, increases the efficiency of wastewater treatment. about b ete n i

A device for flotation sewage treatment, containing a cylindrical tank with a tangential inlet, a pipe for discharging purified water and a coaxially installed central discharge pipe, characterized in that, in order to increase the efficiency of sewage treatment by preventing foam destruction and shortening its residence time in the device 5 ve, it is equipped with a receiving chamber located in the upper part of the cylindrical tank, while the inlet is placed in the receiving chamber above the discharge valve loss

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fig i

2

FIG. 2

Claims (1)

' Claim . 25 A device for flotation wastewater treatment, containing a cylindrical container with a tangential inlet, a pipe for removing purified water and a coaxially mounted central discharge pipe, characterized in that, in order to increase the efficiency of wastewater treatment by preventing foam destruction and reducing the time of its stay in the device, it is equipped with a receiving chamber located in the upper part of the cylindrical tank, while the inlet pipe is placed in the receiving chamber above the discharge th pipes. ’ FIG. 1 of FIG. 2