Process for treating municipal sewage through excess sludge fermentation carbon source enhanced denitrifying phosphorus removal-partial short-cut denitrification-anaerobic ammonia oxidation

Abstract

The invention relates to a process for treating municipal sewage through excess sludge fermentation carbon source enhanced denitrifying phosphorus removal-partial short-cut denitrification-anaerobic ammonia oxidation, belonging to the field of municipal sewage treatment and recycling. A reaction device used in the invention is composed of a raw water tank, an SBR1 reactor, an SBR2 reactor, an SBR3 reactor and an intermediate water tank. The operation mode of the SBR2 is water feeding/fermented material feeding/anaerobic stirring/anoxic stirring/aerobic aeration; and after raw water enters the SBR2, a sludge fermented material from the SBR1 is fed, and then the raw water enters an anaerobic section. Microorganisms synthesize an internal carbon source by utilizing COD in municipal sewage and volatile fatty acid (VFAs) in a fermentation product, and excessively release phosphorus in cells. Then, the nitrate nitrogen-containing effluent of the SBR3 enters the SBR2, the effluent of the SBR2 enters an anoxic section, and the microorganisms perform a denitrification phosphorus removal-short-cut denitrification-anaerobic ammonia oxidation reaction by using the internal carbon source. Finally, the effluent of the SBR2 enters an aerobic section. According to the invention, sludge reduction can be realized, sludge treatment cost is reduced, and the process is suitable for advanced treatment of municipal sewage with low COD/N and low B/C.

Description

technical field [0001] The invention discloses a process for treating urban sewage by enhanced denitrification and dephosphorization-partial short-range denitrification-anaerobic ammonium oxidation as carbon source of excess sludge fermentation, which is suitable for low COD / N and low BOD in my country 5 / COD (B / C) urban sewage, while also achieving sludge reduction, is an economical and sustainable energy-saving and consumption-reducing sewage treatment technology. It belongs to the field of urban sewage treatment and resource utilization. Background technique [0002] The traditional nitrogen and phosphorus removal process involves multiple biochemical reaction processes such as nitrification, denitrification, phosphorus release and phosphorus absorption. Each process not only has different requirements for microbial composition and substrate type, but also has contradictions in operating conditions. As a result, the operation of each process cannot reach the optimal stat...

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Problems solved by technology

[0009] Aiming at the problems that low COD/N, low B/C city sewage denitrification and dephosphorization effects cannot be achieved at the same time, additional carbon sources are often needed to increase operating costs, and residual sludge is difficult to treat, the present invention proposes the use of residual sludg

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