Device and method for enhancing advanced nitrogen and phosphorus removal from municipal wastewater by using excess sludge anaerobic fermentation mixture through two stages of SBRs (sequencing batch reactors)

Abstract

The invention discloses a device and a method for enhancing advanced nitrogen and phosphorus removal from municipal wastewater by using an excess sludge anaerobic fermentation mixture through two stages of SBRs (sequencing batch reactors), and belongs to the field of biochemical treatment of wastewater. The device comprises an excess sludge fermentation tank, a sludge storage tank, a raw water tank, an intermediate water tank, the two SBRs, an air compressor and a peristaltic pump. The method comprises the steps that a domestic wastewater and excess sludge fermentation mixture enter the first SBR firstly for anaerobic phosphorus release, shortcut nitrification and anoxic denitrifying phosphorus accumulation; drained water from the first SBR enters the intermediate water tank and then enters the second SBR, NH4<+>-N and NO2<->-N, which are not nitrified and produced through fermentation of hydrolytic acidification organisms, in the drained water are continuously subjected to further nitrification, meanwhile, phosphorus-accumulating organisms accumulate phosphorus sufficiently, and finally, advanced nitrogen and phosphorus removal from the domestic wastewater is realized. The device and the method are applicable to enhanced nitrogen and phosphorus removal from the municipal wastewater with low C / N and C / P, carbon sources are saved, the nitrogen and phosphorus removal efficiency is increased, and sludge reduction treatment is realized.

Description

technical field [0001] The invention relates to an optimization control technology for using excess sludge anaerobic fermentation mixture to strengthen deep denitrification and phosphorus removal of urban domestic sewage, and belongs to the fields of urban sewage treatment and sludge biochemical treatment. This process is suitable for the enhanced nitrogen and phosphorus removal of low C / N and C / P urban domestic sewage. Background technique [0002] With the continuous growth of population and the continuous improvement of people's living standards, the per capita discharge of domestic sewage continues to increase, coupled with the widespread use of detergents, the nitrogen and phosphorus content in urban sewage is relatively high, and after being discharged into water bodies, the nitrogen and phosphorus in receiving water bodies An increase in the content will lead to eutrophication of the water body, damage the water body environment, and affect the water supply quality. ...

AI Technical Summary

Problems solved by technology

Considering practical problems such as operating costs, the cost of only using sludge fermentation supernatant is too high

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