MBR wastewater treatment system with deep denitrification and dephosphorization functions

Abstract

The invention provides an MBR wastewater treatment system with deep denitrification and dephosphorization functions. The MBR wastewater treatment system sequentially comprises an anaerobic pool, a front anoxic pool, an aerobic pool, a rear anoxic pool and a membrane pool. The membrane pool does not contain an aeration part, a membrane set device realizes reciprocating motion through a mechanical transmission device, thus the membrane pollution problem is effectively solved, MBR process aeration energy consumption is further reduced, and the situation that the content of water outlet total nitrogen is increased due to excessive oxidation of sludge is further avoided. Through improvement for the membrane pool, the membrane pool directly returns a flow to the anaerobic pool, a process flow return form is simplified, and meanwhile, the situation that the biological dephosphorization effect is affected by flow return of DO and excessive nitrate nitrogen is further avoided. Through partitionaeration, the content of the DO of the control tail end of the aerobic pool is less than 0.1 mg / L, and the denitrification effect of the rear anoxic pool is improved, a flow return point and a rear dosing point are arranged at a middle section in the rear anoxic pool, thus denitrification of an internal source and an external source can be realized simultaneously, the denitrification cost is reduced, and when a carbon source is added externally, it can be ensured that the content of the water outlet total nitrogen is less than 1 mg / L. The MBR wastewater treatment system is used for municipalwastewater treatment and can realize earth surface IV-type water outlet when the carbon source is not added externally, wherein the content of TN is less than 5 mg / L, and the content of TP is less than 0.2 mg / L.

Description

【Technical field】 [0001] The invention relates to an MBR sewage treatment system capable of deep denitrification and phosphorus removal, and an operation method of the sewage treatment system. 【Background technique】 [0002] The high concentration of nitrogen and phosphorus pollutants in water bodies is the main cause of eutrophication in water bodies. Existing sewage treatment plant discharge standards (TN<15mg / L, TP<0.5mg / L) make the sewage discharge still cause a large burden on the water environment, and it is necessary to further improve the discharge water requirements of sewage treatment plants to alleviate water environmental pollution. In order to meet higher water quality requirements, sewage treatment plants usually add excessive carbon sources and phosphorus removal agents, which will inevitably increase the cost of sewage treatment, thus making it a technical upgrade for traditional sewage treatment plants to maintain economic efficiency while deeply remov...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of high energy consumption and total nitrogen release of traditional aerobic MBR, and provide a sewage treatment system that strengthens endogenous denitrification and reciprocating MBR process for deep nitrogen and phosphorus removal, so as to improve the efficiency of raw sewage. Efficient utilization of carbon sources and effluent quality

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