RU18271U1 - AEROTENC FOR WASTE WATER TREATMENT CONTAINING FOAM FORMERS - Google Patents

Abstract

An aeration tank for the treatment of wastewater containing foaming impurities, including a reservoir, pneumomechanical aerators, sectional partitions with liquid overflow windows, pipelines for supplying wastewater, activated sludge and removal of a sludge mixture, characterized in that it additionally contains ejector devices with air supply through a conical nozzle, installed in the corners of each section and serving for aerodynamic destruction of the foam.

Description

AEROTEIC FOR WASTE WATER TREATMENT CONTAINING FOAM FORMERS

The utility model relates to biological treatment of wastewater containing foaming impurities, and can be used in wastewater treatment of the pulp and paper industry to increase its efficiency.

In the biological treatment of wastewater containing foaming impurities, for example, tall oil, the thickness of the foam layer in the aeration tank, where the sludge mixture is bubbled with atmospheric oxygen, can reach 1.5 -2 m. A layer of foam on the surface prevents the involvement of atmospheric air in the volume of the treated liquid, and a decrease in the concentration of dissolved oxygen in the sludge mixture reduces the effectiveness of biological wastewater treatment from organic contaminants.

Chemical additives, in particular fatty acids or mineral oils, can be used to combat pricing. The disadvantage of this method is that additional pollutants are added to the purified water, which negatively affects the efficiency of wastewater treatment.

A known method of using a device with vibrating blades to dynamically reduce the level of foam. The device contains blades attached to the movable pin in a vertical direction; 1 the blade, which when lowered into the surface layer of the liquid have on floating on it

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MKl. C02 F 3/02 Foam located in the area limited by the blades, sealing

exposure (see C02 F 1/40, COZF 3/12, application Jfe 3-157T87).

The closest technical solution is the aeration tank with a pneumomechanical aerator consisting of a tank, a pneumomechanical aerator, sectional baffles, sewage supply pipelines, activated sludge and sludge discharge (see. Methods for increasing the efficiency of the sewage treatment plant / Sat. Scientific works. - M. , VNIIVODGEO Publishing House, 1989, pp. 51-56.).

The design drawback is that during the operation of the pneumomechanical aerator, when cleaning pricing wastewater, on the surface of the section “liquid is air-breathing”, a foam layer is formed that prevents the involvement of atmospheric air in the volume of the treated liquid and reduces the efficiency of biological treatment of wastewater at low concentrations oxygen.

The essence of the utility model consists in the fact that the aeration tank for wastewater treatment containing foaming impurities, including a reservoir, a daylight mechanical aerator, sectional partitions, sewage water supply pipe, activated sludge, air and sludge discharge additionally contains ejector devices with air supply through a conical nozzle installed in the corners of each section and serving for the aerodynamic destruction of the foam.

The essence of the utility model is illustrated by the drawing, where in FIG. 1 is a sectional view of a predictable useful model; FIG. 2 is a plan of a proposed utility model.

2.

FIG. 3 - ejector device with air supply through a conical nozzle

FIG. 4 - fastening of the ejector device to the wall of the aeration tank.

The device contains a reservoir) I, pneumomechanical aerators 2, sectional degassers 3 with overflow windows 4, sewage supply pipelines 5, activated sludge 6 and sludge discharge 7, air duct 8 with shut-off and control valves 9, ejector, device 10 with supply air from the air duct through a conical nozzle 11, installed in the corners of each section, anchor clamps 12 for fastening ejectors.

Aeration tank for the treatment of wastewater containing foaming impurities, works as follows. Wastewater 5 and activated sludge 6 enter the first section of the tank I, where it forms a sludge when mixed, then flows sequentially into the next section through the windows of liquid overflow 4. The aeration of the sludge is carried out using a pump

pneumomechanical aeration pumps Z dispersing the air supply 8 and involving atmospheric air during air supply, such as through an expanding valve, icopnyca qspaTOpa 2h. When aeration of wastewater containing price-forming areas, a foam layer is formed on the surface of the water that prevents foam air into the volume of the processed fluid. In this case, under the action of centrifugal sshpd, a higher layer of foam is formed along the perimeter of the section, Oliger to the corners. In the event of shut-off and control valves, 9 centrifugal ducts,% the air stream exiting through the conical nozzle of small diameter 11 in the ejector device 10 is sucked into the rarefaction zone formed above the level

liquids, foam. In the ciline of the physical part of the ejector destruction of the foam occurs. Ejector devices 10 are installed against the walls in each corner of the section and are attached with. using anchors, brackets 12 Air flow rate is regulated Q using a shut-off armdure 9 and air duct 8, The height of the device is 0.2 - 0.3 m and the liquid level in the aeration tank. The sludge mixture is discharged through the pipeline / sludge mixture into the secondary sump.

The proposed device allows to produce

defoaming without the addition of additional chemical anti-foaming agents improves the efficiency of the aeration tank by increasing oxygen concentrates by involving atmospheric air in the mass of the treated liquid.

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Claims (1)

Aeration tank for treating wastewater containing foaming impurities, including a reservoir, pneumomechanical aerators, sectional partitions with liquid overflow windows, sewage supply pipes, activated sludge and sludge mixture, characterized in that it further comprises ejector devices with air supply through a conical nozzle, installed in the corners of each section and serving for the aerodynamic destruction of the foam.