RU2595680C2 - Floatation plant for purifying waste water - Google Patents

Abstract

FIELD: treatment plants.

SUBSTANCE: invention relates to water treatment. Flotation waste water treatment plant comprises housing 1 with partitions 12, 14, 16, purified water chamber 21, a device for initial water saturation with air bubbles, which consists of pump 24, ejector 27 and a pneumohydraulic dispersant. Ejectors 27 are made cylinder-conic. Foam removing device is presented in the form of self-priming unit 4 accommodating screw 5 with the ratio of diameter to length from 1 to 3÷9. On the outer side of housing 1 there is foam chute 10 arranged inclined from 5 to 30° relative to the horizon.

EFFECT: invention increases efficiency of purifying waste water.

8 cl, 1 dwg

Description

Technical field

The invention relates to processes and devices for wastewater treatment.

State of the art

Known pneumohydraulic dispersant used in the coal industry for the enrichment of ores of non-ferrous and ferrous metals, as well as in wastewater treatment, containing in series a series of chambers connected to each other by means of nozzles, in each of which there is an impact partition made in the form of a three-dimensional figure and installed coaxial to the nozzle, while in front of each chamber coaxially, an injector is installed inside the nozzle, having the form of a cylinder and cone aligned with the bases and a fairing made in the form of hemispheres with a diameter equal to the diameter of the injector, and a cylinder with an air supply pipe and a perforated base facing the cowling, and the pipes connecting the chambers are in the form of combined cylinder and nozzle bases (Utility Model Patent No. 27506, pr. 22.07.2002, IPC B03D 1/14). The disadvantage of this device is the low degree of dispersion, leading to low efficiency of wastewater treatment.

The closest technical solution (prototype) is an installation for flotation water treatment, comprising a housing with partitions, a purified water chamber, a mechanism for removing foam with a foam collector, a device for saturating the source water with air bubbles, consisting of a pump, ejector, and a pneumohydraulic dispersant (RF Patent No. 2251530, pr. 24.02.2004, IPC C02F 1/24).

A disadvantage of the known flotation unit is the low efficiency of wastewater treatment.

Disclosure of invention

The objective of the invention is to develop a new design that provides a high degree of dispersion and removal of contaminants.

The technical result is to increase the efficiency of wastewater treatment.

The task and the specified technical result are achieved in that the flotation plant for wastewater treatment contains a housing with partitions, a purified water chamber, a device for saturating the source water with air bubbles, consisting of a pump, ejector and a pneumohydraulic dispersant. According to the invention, the ejector is made cylindrical in shape. The foaming device is presented in the form of a self-priming unit, inside of which a screw is installed with a diameter to length ratio of 1 to 3 ÷ 9, respectively. On the outside of the casing there is a foam trough installed with an inclination of 5 to 30 ° with respect to the horizontal.

The conical part of the ejector is made with a taper angle from 5 to 45 °, and also in the form of a truncated cone, the smaller section of which is equipped with perforations with a live section from 25 to 50%.

The housing of the installation has a cylindrical shape.

The number of ejectors should be from 2 to 10.

The lower part of the body is made in the form of a truncated cone. Inside the case, it is advisable to install additional partitions with a diameter of holes from 0.01 to 0.1 mm and with a common living section from 20 to 60%.

The bottom of the foam trough has a perforation with a live section of 10 to 30%.

Image enumeration

In FIG. 1 shows a flotation plant for wastewater treatment.

The implementation of the invention

The proposed flotation unit includes a cylindrical-shaped body 1, the lower part of which is made in the form of a truncated cone, a foam-removing device, which is a self-priming unit 4 with a screw 5 with a diameter to length ratio of 1 to 3 ÷ 9, respectively, an ejector 6 and a compressor 7. With an external the sides of the housing 1 are a pipe 11 for supplying dirty water, a pipe 2 for working fluid, a pipe 3 for air, a pipe 19 for draining water with a water drainage regulator 18, a pipe 20 for recycling purified water, a pipe 28 for draining about adka. In the lower part of the housing 1 there are supports 22, and on top there is a foam trough 10 installed with an inclination of 5 to 30 ° with respect to the horizontal. The groove 10 is made with a perforated bottom 17 with a live cross section from 10 to 30% with a pipe 9 for draining foam and a pipe 8 for draining water. Inside the housing 1, an ejector 27 and a dispersant 23 are installed with guide elements 26 for aeration of water. The space of the flotation unit is divided into aeration chambers 13, 15 and a purified water chamber 21 by baffles 12, 14 and baffle 16 with a hole diameter from 0.01 to 0.1 mm and with a common living section from 20 to 60%. The number of ejectors 27 is from 2 to 10 pieces, they are cylindrical in shape and the taper angle is from 5 to 45 °, the smaller cone section has perforation with a live section from 25 to 50%. The pump 24 is connected by a pipeline to the valve 25.

The principle of operation of the proposed flotation plant is as follows.

The source (dirty) water is supplied through the pipe 11 to the area of the dispersant 23 into the aeration chamber 13. The working fluid, the flow rate of which is regulated by the valve 25, is pump 24 and flows through the pipe 2 into the ejector 27. Due to the occurrence of a zone of reduced pressure in the ejector 27 air through the pipe 3 and its mixing with the water stream. The resulting mixture through the guide element 26 falls into the arrays of the dispersant 23, upon contact with which the air-water mixture is dispersed to the smallest bubbles and intensive mixing of the air-water mixture with contaminated water. Water with the resulting flotation complexes enters the aeration chamber 15, separated by partitions 12 and 14, while the flotation complexes float, forming a foam that enters the foam groove 10 with a perforated bottom 17. In this case, the foam is discharged through the pipe 9, and drainage water through the pipe 8. The foam enters the self-priming unit 4, passes through the ejector 6, in which it is destroyed. The suction of the foam is carried out by supplying air to the ejector 6 by the compressor 7. The sludge is transported by the screw 5. At the same time, sedimentation particles can be deposited, while sediment is collected in the lower part of the housing 1, made in the form of a truncated cone, and discharged through the pipe 28. Next, water passes through the partition 16 and enters the chamber 21 of purified water, from which the main part of the purified water is discharged through a pipe 19 with a water discharge regulator 18, and the other part - through a pipe 20 for reuse in as a working fluid.

Claims (8)

1. Flotation installation for wastewater treatment, comprising a housing with partitions, a purified water chamber, a device for saturating the source water with air bubbles, consisting of a pump, ejector and a pneumohydraulic dispersant, characterized in that the ejectors are made in a cylindrical shape, while the foam-removing device is presented in in the form of a self-priming unit, inside of which there is a screw with a diameter to length ratio of 1 to 3 ÷ 9, respectively, and on the outside of the casing there is a foam chute installed with tilt from 5 to 30 ° in relation to the horizontal. 2. Flotation unit according to claim 1, characterized in that the conical part of the ejector is made with a taper angle of 5 to 45 °. 3. The flotation unit according to claim 1, characterized in that the conical part of the ejector is made in the form of a truncated cone, the smaller section of which is equipped with perforations with a live section from 25 to 50%. 4. Flotation plant according to claim 1, characterized in that the housing is cylindrical in shape. 5. Flotation plant according to claim 1, characterized in that the number of ejectors is from 2 to 10. 6. Flotation unit according to claim 1, characterized in that the lower part of the housing is made in the form of a truncated cone. 7. The flotation plant according to claim 1, characterized in that additional baffles with a hole diameter of from 0.01 to 0.1 mm and with a total live section of 20 to 60% are installed inside the housing. 8. The flotation unit according to claim 1, characterized in that the bottom of the foam trough has perforation with a live section of 10 to 30%.

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