Two-stage biological selection denitrifying phosphorus and nitrogen removal sewage treatment device and method thereof

Abstract

The present invention provides a two-stage biological selection denitrifying phosphorus and nitrogen removal sewage treatment device and a method thereof, relates to a device and a method for sewage treatment, and aims to solve the problem that inner contradiction existing in anaerobic, anoxic, aerobic and other phosphorus and nitrogen removal processes of a sewage treatment plant cannot meet the requirements of 'Discharge standard of pollutants for municipal wastewater treatment plant' (GB 18918-2002) in China. The device adopts a technical scheme that: a second anaerobic biological selector is communicated with a sedimentation tank; and a first anaerobic biological selector is communicated with an anoxic pond. The technical scheme of the method comprises the following steps: 1, pumping raw water into the first anaerobic biological selector; 2, allowing effluent treated by the step 1 to enter the second anaerobic biological selector; 3, allowing the effluent treated by the step 2 to flow to the anoxic pond; 4, allowing the effluent treated by the step 3 to enter a first aerobic pond; 5, allowing the effluent treated by the step 4 to enter a second aerobic pond; and 6, allowing the effluent treated by the step 5 to enter the sedimentation tank, and directly discharging supernatant. The device and the method are used for municipal sewage treatment.

Description

technical field

[0001] The invention relates to a sewage treatment device and method, belonging to the field of sewage treatment. Background technique

[0002] At present, most sewage treatment plants in my country use anaerobic, anoxic and aerobic biological treatment processes for nitrogen and phosphorus removal, but due to the defects of the process itself, it is mainly manifested in: nitrifying bacteria, denitrifying bacteria and phosphorus accumulating bacteria The contradictions of different sludge ages; the contradictions of the competition between nitrifying bacteria and phosphorus accumulating bacteria on the substrate (carbon source); the contradictions of the inhibition of anaerobic phosphorus release by the nitrate nitrogen carried by the sludge backflow; the contradictions of relatively large sludge production. The combination of the above contradictions makes it difficult for the nitrogen and phosphorus in the effluent of sewage plants to simultaneously meet the...

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