Device and method for realizing high-efficiency denitrification of low-C/N sewage through anoxic MBR (Membrane Bioreactor) enhanced endogenous denitrification

Abstract

The invention relates to a device and a method for realizing high-efficiency denitrification of low C / N sewage through anoxic MBR (Membrane Bioreactor) enhanced endogenous denitrification, belonging to the field of biological sewage treatment. The device mainly comprises a raw water tank, an MBR (Membrane Biological Reactor), a water outlet tank and an in-situ membrane cleaning and control system. The MBR reactor is divided into an anaerobic section, an aerobic section and an anoxic section, and the anoxic section is provided with a membrane assembly; the method comprises the following steps: firstly, intensively synthesizing an internal carbon source and performing anaerobic phosphorus release through phosphorus-accumulating bacteria and glycogen-accumulating bacteria under an anaerobic condition, then performing a nitration reaction under an aerobic condition to generate NO3-N, and performing an endogenous denitrification reaction under an anoxic condition to reduce the NO3-N into N2. Compared with traditional nitrification and denitrification, the anoxic MBR enhanced endogenous denitrification has the advantages that the utilization rate of an external carbon source is higher, the sludge yield is lower, and meanwhile, the effluent quality is better. In addition, an in-situ membrane cleaning and control system is introduced, and a PLC control system is used for controlling a flexible membrane cleaning device to implement in-situ physical cleaning on the flat plate ceramic membrane, so that the problem of membrane pollution is effectively relieved.

Description

Technical field [0001] An oxygen-deficient MBR-enhanced endogenous denitrification to achieve low C / N sewage high-efficiency denitrification, which is a sewage biological treatment, and a method and method based on membrane biological reactor sewage. Background technique [0002] Substances such as nitrogen such as sewage are discharged to natural water, which is very important in realization of environmental pollution, so it is very important in realization of sewage depth nitrogen. Traditional biological denitrification technology utilizes nitrocellide to O 2 Electronic receptor, NH 4 + -N is an electron donor, will be NH 4 + -N oxidation to NO 3 - -N; denitrifuginal bacteria in NO 3 - -N is an electronic receptor, carbon source is an electronic donor, and NO 3 - -N reduction is n 2 Thus effective removal of nitrogen in the water body. However, a large number of aeration and carbon sources have seriously increased the treatment cost of sewage treatment plant and the diff...

AI Technical Summary

Problems solved by technology

However, the demand for a large amount of aeration and carbon sources has seriously increased the cost of sewage treatment in sewage treatment plants and the difficulty of sludge treatment. New technologies for low-energy sewage treatment have become the needs of the development of the times

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