Reinforced denitrification and dephosphorization circulation type biological membrane system for domestic sewage treatment

Abstract

The invention relates to a reinforced denitrification and dephosphorization circulation type biological membrane system for domestic sewage treatment. The system comprises a denitrification quadruplemechanism, a dephosphorization double mechanism and a backflow mechanism which are in communication connection with a programmable controller system separately; the denitrification quadruple mechanismcomprises a pre-denitrification tank, a fixed filler anoxic tank, a carrier flow aerobic tank and a fixed filter bed tank; the dephosphorization double mechanism comprises a sludge tank and a sedimentation tank; the backflow mechanism comprises a sludge backflow mechanism and a nitrification liquid backflow mechanism. A sludge mixed solution at he bottom of the sedimentation tank is recycled to the pre-denitrification tank and the sludge tank through the sludge backflow mechanism, and nitrification liquid flowing out of the fixed filter bed tank is recycled to the fixed filler anoxic tank through the nitrification liquid backflow mechanism. Therefore, the quadruple reinforced denitrification function and the double reinforced dephosphorization function are used, and it can be stably guaranteed that the nitrogen and phosphorus removal rate is 90% or above; the circulation type biological membrane system is also used, and additional activated sludge, a carbon source and a pH adjusting solution are not needed, so that the problems of complex operation, high cost, high energy consumption and the like in the prior art are solved.

Description

technical field [0001] The invention belongs to the technical field of domestic sewage treatment, in particular to an enhanced denitrification and phosphorus removal cycle biofilm system for domestic sewage treatment. Background technique [0002] Domestic sewage is one of the causes of water pollution and an important cause of lake eutrophication. In the current domestic sewage treatment process, there are generally problems of poor removal rates of ammonia nitrogen, total nitrogen, and total phosphorus. [0003] Chinese patent CN201710402701.1 discloses a start-up and control method for denitrification treatment of urban domestic sewage by nitrification-DEAMOX process. Sludge meets the process of denitrification ammonium oxidation and short-range nitrification anammox, so as to achieve the removal of nitrogenous pollutants in sewage. The technical reaction program control program is complex, the electronic control system has many fault points, and the actual operation is...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above technical problems, the purpose of the present invention is to provide a method to improve the instability of total nitrogen removal rate, poor denitrification effect, inaccurate backflow adjustment, high cost of adding carbon source in the later stage, difficulty in coping with water quality fluctuations, C / N ratio, Enhanced Nitrogen and Phosphorus Removal Cyclic Biofilm System for Domestic Sewage Treatment Against the Weak Impact Load of Water

Images