Novel sewage treatment system and process

Abstract

The invention discloses a novel sewage treatment system and process. The novel sewage treatment system comprises an anaerobic pool, a first anoxic pool, a first aerobiotic pool, a second anoxic pool,a second aerobiotic pool, a third anoxic pool, a third aerobiotic pool, a secondary sedimentation tank and a pre-anoxic pool, wherein the anaerobic pool, the first anoxic pool, the first aerobiotic pool, the second anoxic pool, the second aerobiotic pool, the third anoxic pool, the third aerobiotic pool and the secondary sedimentation tank are sequentially communicated with one another; the pre-anoxic pool is communicated with the secondary sedimentation tank, the anaerobic pool and the third aerobiotic pool; sludge at the middle part of the secondary sedimentation tank flows into the pre-anoxic pool, and supernatant of the pre-anoxic pool flows back to the third aerobiotic pool; concentrated sludge in the pre-anoxic pool flows back to the anaerobic pool; part of sewage in the second aerobiotic pool flows back to the first anoxic pool; part of sewage in the anaerobic pool is directly diverted to the second anoxic tank. According to the scheme, the reaction rate and the efficiency of the whole system are optimized, and the functions of denitrification and phosphorous removal are enhanced, so that a more efficient treatment effect is achieved within a limited reaction volume.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a novel sewage treatment system and process. Background technique [0002] AAO method, also known as A2O method, is the abbreviation of anaerobic-anoxic-aerobic method. Nitrogen and phosphorus removal effect. Anaerobic reactor, the raw sewage and phosphorus-containing return sludge discharged from the secondary sedimentation tank enter simultaneously, the main function of this reactor is to release phosphorus, and at the same time, part of the organic matter is ammonified; the anoxic reactor, the primary function is to denitrify, nitrate The state nitrogen is sent from the aerobic reactor through internal circulation, and the amount of mixed liquid in circulation is relatively large, generally 2Q (Q is the flow rate of raw sewage); the aerobic reactor, that is, the aeration tank, is a reaction unit Functional, removal of BOD, nitrification and absorption of phosphorus,...

AI Technical Summary

Problems solved by technology

In the prior art, the sludge in the secondary settling tank is directly returned to the anaerobic tank. Due to the large flow rate, it will cause dilution of the reactants in the anaerobic zone and the front reaction zone of the system, especially the concentration of carbon source organic matter.

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