Reinforceable denitrification nitrogen removal and phosphorus removal system based on multi-point water feeding and multi-mode operation

Abstract

The invention relates to a reinforceable denitrification nitrogen removal and phosphorus removal system based on multi-point water feeding and multi-mode operation, and belongs to the technical fieldof sewage treatment. The system comprises a pre-anaerobic pool, an anaerobic pool, a first anaerobic pool, a first oxic pool, a deoxygenation pool, a second anaerobic pool, a second oxic pool, an external carbon source adding system and a mixed liquid inner backflow system, wherein the pre-anaerobic pool, the anaerobic pool, the first anaerobic pool, the first oxic pool, a deoxygenation pool, thesecond anaerobic pool and the second oxic pool are sequentially connected. By aiming at the general phenomena of sewage treatment of high feeding CODcr and feeding TN concentration change, low C-N ratio and high-standard discharge, the deoxygenation pool and the second anaerobic pool are switched between two states of the oxic state and the anaerobic state so as to cope with the feeding quality change; the reasonable allocation and efficient utilization of the carbon source are realized through multi-point water feeding and external carbon source adding point optimization. The system has the advantages that the effluent quality is high; the carbon source utilization rate is high; the flexibility is high; the production operation cost is low, and the like.

Description

technical field [0001] The invention relates to an intensified denitrification denitrification and phosphorus removal system based on multi-point water intake and multi-mode operation, belonging to the technical field of sewage treatment. Background technique [0002] Nitrogen and phosphorus pollution is the main cause of eutrophication in water bodies, and it is also the main problem faced by many polluted water bodies. The carbon-to-nitrogen ratio (C / N) of urban domestic sewage is generally low, and sewage treatment plants generally have the problem of insufficient internal carbon sources in sewage, while the denitrification process requires organic carbon sources as energy sources and electron donors for denitrifying bacteria. If there is insufficient internal carbon source for denitrification, an external carbon source needs to be added to achieve denitrification. Using a multi-point water inlet system and adding external carbon sources to the second anoxic pool can mak...

AI Technical Summary

Problems solved by technology

[0006] In order to ensure the denitrification efficiency, it is necessary to set the mixed liquid internal return system from the end of the aerobic tank to the anoxic tank. Under the traditional anaerobic / anoxic / aerobic (AAO) biochemical process conditions, the mixed liquid return point is set at the end of the aerobic tank , the concentration of dissolved oxygen is relatively high, returning to the anoxic tank will consume part of the carbon source and cause poor anoxic conditions, affecting the denitrification effect

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