RU2703222C1 - Flotation plant for purification of natural and waste water - Google Patents

Abstract

FIELD: water and air purification technology.

SUBSTANCE: invention relates to purification of natural and waste water, in particular, to flotation machines for cleaning contaminated water. Proposed flotation plant comprises flotation chamber 1, saturator 4, scraper removal mechanism 7, float effluent tray 5, feed lines 2 and purified water discharge pipes. Above float effluent tray 5 there are installed sprinkler heads 10 connected through pipeline 9 to the liquid supply source for foam suppression. Float effluent tray 5 has receiving device 12 in the form of a funnel with discharge pipeline 13. Pipeline 9 configured to supply liquid for foam damping is equipped with locking device 11 made with possibility of continuous supply of liquid for foam suppression.

EFFECT: invention allows improving operating reliability of a flotation plant for cleaning natural and waste water.

1 cl, 1 dwg

Description

FIELD OF THE INVENTION

The invention relates to the field of purification of natural and waste water, namely to flotation machines for the purification of contaminated water.

Technical field

A device for flotation wastewater treatment, comprising a housing, a system for supplying a processed liquid and a flotation agent, a system for removing the treated liquid and a system for collecting flotation sludge; additionally, a flocculation chamber is built inside the casing, made in the form of a truncated cone with a large base upwards, to which the working fluid supply pipe is additionally connected, and to the bottom of the truncated cone, a processed fluid and flotation agent supply system, into which an ejector with a circulation sediment pipe is additionally introduced, and above the large base of the truncated cone of the flocculation chamber has a mechanism for removing foam. [one]

The disadvantage of this device is that it is characterized by excessive structural complexity and low efficiency in operation, due to contamination of the area of its operation due to emissions from the foam layer of sludge.

Also known is a flotation unit for treating natural and waste waters, containing a flotation chamber, a saturator, a scraper sludge removal mechanism, a tray for collecting flotation sludge, pipelines for supplying the source and discharge of purified water. [2]

A disadvantage of the known flotation plant for treating natural and waste waters is that such a plant is unnecessarily structurally complex and does not provide high operational efficiency, since it does not provide a quick discharge of the foam product formed on the surface.

It is known that in the presence of a significant amount of surface-active substances in the treated water, the layer of sludge has a significant thickness and low pressure. To extinguish the foam head, jets of liquid are used, which are formed by sprinkler heads, however, periodic supply of liquid does not provide a constant increase in pressure under the foam layer, which makes it difficult to drain the spent slurry.

Disclosure of invention

The aim of the invention is to increase the reliability of the flotation plant for the treatment of natural and waste water.

This goal is achieved by simplifying the design of the installation and equipping it with a device for the removal of slime and continuous supply of liquid to extinguish the foam.

A flotation plant for treating natural and waste water contains a flotation chamber, a saturator, a scraper sludge removal mechanism, a tray for collecting sludge, pipelines for supplying raw and discharged purified water, sprinkler heads are installed above the tray for collecting sludge, connected through a pipe to a source of fluid for extinguishing foam , a receiving device in the form of a funnel with a discharge pipe is installed in the tray for discharging flotation sludge, and a pipe made with the possibility of supplying liquid for quenching It is equipped with a locking device made with the possibility of continuous supply of liquid to extinguish the foam.

A continuous supply of liquid provides not only a constant decrease in the thickness of the foam layer, but also an increase in pressure in the layer of spent sludge, which accelerates the removal of foam from the sludge tray.

Brief Description of the Drawings

The invention is illustrated in the drawing, where in FIG. 1 shows a diagram of a flotation plant for the treatment of natural and wastewater.

The implementation of the invention

A flotation plant for treating natural and wastewater contains a flotation chamber 1 with a supply pipe 2 for the source and a purified water discharge pipe 3. The chamber 1 is equipped with a saturator 4, as well as a tray 5 for collecting the flotation sludge and a tray 6 for purified water. Above the chamber 1, a scraper sludge removal mechanism 7 is installed, equipped with blades 8. Above the tray 5 for collecting flotation sludge, a pipe 9 is installed, equipped with sprinkler heads 10 and connected to a saturator 4. A shut-off device 11 is installed on the pipe 9 for regulating the flow of fluid to the sprinkler heads, and in a receiving funnel 12 in the form of a funnel with a discharge pipe 13 is installed in the tray 5 for removing the slurry. The pipe 9 can be connected to another source of liquid to extinguish the foam, for example, water or steam th highway, or to the fluid supply system for extinguishing foam.

Flotation unit operates as follows.

The untreated effluent mixed with air under pressure enters through a pipe 2 to a saturator 4, where the air dissolves in water during its residence under pressure. From saturator 4, water saturated with air enters the flotation chamber 1 with a sharp drop in pressure. At the same time, tiny air bubbles are formed in the entire water volume during desorption, which foam mainly on the particles of contaminants. In addition, during turbulent withdrawal of water into the flotation chamber 1, air bubbles additionally accumulate pollution particles on their surface due to inertial deposition. Air bubble aggregates - contaminants float to the surface of the water, where they form a layer of flotation sludge, which is removed by a scraper mechanism 7 equipped with blades 8, into the sludge tray 5, where a receiving device 12 is installed in the form of a funnel with a discharge pipe 13. The purified water through the tray 6 is removed by pipeline 3.

If there is a significant amount of Surfactants in the treated water, the layer of sludge has a significant thickness, and when it is discharged by mechanism 7, a foam cap is formed in the sludge tray 5, and the foam can go beyond the installation. To prevent this phenomenon, the foam is quenched by jets of liquid that are formed by sprinkler heads 10 installed on the pipeline 9. In addition, the pressure in the layer of the sludge is less than the pressure in the lower part of the receiving device 12, as a result of which the outflow of the sludge from the tray 5 and the receiving device 12 is inhibited in the discharge pipe 13. To eliminate this phenomenon, the fluid is supplied continuously by opening the locking device 11.

Thus, during operation of the installation provides a quick outflow of sludge from the sludge tray 5 to the receiving device 12 and the discharge pipe 13, which increases the reliability of the flotation unit.

Information sources:

1. Flotation plant for wastewater treatment. Utility Model Patent No. 39594, Cl. C02F 1/24, 2004.

2. Flotation plant for the treatment of natural and waste water. Patent RU 54934 U1, July 27, 2006, p. 1-3.

Claims (1)

A flotation unit for treating natural and waste water, containing a flotation chamber, a saturator, a scraper sludge removal mechanism, a tray for collecting flotation sludge, pipelines for supplying the source and discharge of purified water, characterized in that sprinkler heads are installed above the tray for collecting flotation sludge connected through a pipeline to the source liquid supply for extinguishing foam, a receiving device in the form of a funnel with a discharge pipe is installed in the tray for removing the slurry, and a pipeline made with the possibility of feeding liquid extinguishing foam, equipped with a closing device adapted to continuously supply the liquid to foaming.

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