A defoaming device for biochemical treatment of sewage

Abstract

The invention relates to a defoaming device for biochemical treatment of sewage, comprising an aerobic tank, a sedimentation tank, a defoamer storage and a spray pipeline, the aerobic tank is connected to the sedimentation tank, and it is characterized in that the defoamer The foaming device also includes a filter and a water ejector connected to the defoamer storage. The sedimentation tank is connected to the spray pipeline through a circulation pump, a filter and a water ejector in turn, and the circulation pump transfers the supernatant of the sedimentation tank into the water The water injector sucks the defoamer and mixes it with the supernatant and then enters the spray pipeline; the spray pipeline includes a main pipe and several branch pipes connected in parallel with it, and the water inlet end of the main pipe is connected to the water injector The outlet end of the aerobic tank, the branch pipe is perpendicular to the water flow direction in the aerobic tank, and is distributed in the inner space of the aerobic tank, and several nozzles are arranged at intervals on each branch pipe, which are used to spray the antifoaming agent and mix the supernatant liquid.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a defoaming device for biochemical treatment of sewage. Background technique [0002] With the acceleration of urbanization, the living standards of people in cities and urban circles are constantly improving, and the amount of sewage generated by life or industry is also increasing year by year, which has caused greater pressure and higher requirements on sewage treatment and energy reuse systems. Biological sewage technology uses aerobic or anaerobic microorganisms to degrade organic pollutants in sewage, which is energy-saving and environmentally friendly. However, sewage with more organic pollutants, especially landfill leachate, will always have Foams are generated, if these foams are not treated in time, these foams will overflow the biochemical pool, causing secondary pollution. [0003] The traditional defoaming device used for sewage treatment is to...

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Problems solved by technology

[0004] However, the traditional defoaming device has the following problems: (1) The waste water from the aerobic tank or other process steps is drawn. If it is not filtered, the mud-water mixture enters the end nozzle. Because it contains a large amount of sludge or sediment, the nozzle is often blocked. Moreover, when the nozzle itself is running for a long time, it is also easy to be attached and blocked by the sludge in the circulating wastewater; (2) For large-scale aerobic biochemical treatment tanks or devices, single-point liquid level gauges or large-scale foam scrapers are usually used at present, There are cases where foam detection is not timely or a large-scale foam scraper is used when there is only a small amount of foam, and multi-point detection and timely opening of the defoaming device cannot be achieved, resulting in foam overflow, affecting the defoaming effect, and greater energy consumption; ( 3) The traditional defoaming device, whether it is spray defoaming, spraying defoaming agent or physical foam scraping, usually uses multiple liquid pumps to transport different water bodies, and there are many moving parts, which not only consumes a lot of energy, but also is prone to failure

(4) For large sewage biochemical treatment tanks, the amount of defoamer added is relatively large, and the treatment cost is high

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