CAST process integrated reaction tank for rural domestic sewage treatment

Abstract

The invention provides a CAST process integrated reaction tank for rural domestic sewage treatment. The CAST process integrated reaction tank comprises a biological selection area, a pre-reaction area, a main reaction area, a reflux water decanting area and a clear water area which are sequentially arranged from left to right. According to the CAST process integrated reaction tank for rural domestic sewage treatment disclosed by the invention, the biological selection area is transformed, and water flow with pressure of inlet water and backflow is used for hydraulically stirring the inlet water of the biological selection area, so that the operation electric charge generated by an external water impeller is greatly saved; a perforated sludge discharge pipe on which pipeline platforms are distributed is arranged at the bottom of the tank in the main reaction area, so that precipitated sludge of the main reaction can be guaranteed to be efficiently conveyed to the front-end biological selection area by a reflux pump; and an electric emptying valve is arranged at a manhole in the main reaction area, so that the gas pressure equal to the water level pressure is released, and the problem that the water decanting effect is poor due to the fact that bubbles are continuously emitted and floating mud is floated in a tank due to the fact that the liquid level is lowered in the water decanting stage is solved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a CAST process integrated reaction pool for rural domestic sewage treatment. Background technique [0002] The circulating activated sludge process (referred to as CAST process) is a batch reactor. In the CAST process equipment, aeration and non-aeration are alternately operated. The secondary sedimentation tank of the traditional conventional process is omitted, and the biological reaction and mud-water separation are One zone is completed. In the biological selection zone, microorganisms can quickly absorb most of the soluble organic matter in sewage through the rapid transfer mechanism of enzymes, and undergo a rapid accumulation process of high-load matrix, which has a great impact on influent water quality, water quantity, pH and toxic and harmful substances. In the pre-reaction zone, the denitrification and denitrification reaction can take place in the...

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Problems solved by technology

[0004] In view of this, the present invention aims to propose a CAST process integrated reaction tank for rural domestic sewage treatment to overcome the shortcomings of high operating costs and unstable treatment effects of existing rural sewage treatment systems

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