Device and method for deep denitrification by enhancing of endogenous denitrifying and coupling with low-DO (dissolved oxygen) nitration with energy-saving and consumption-decreasing effects

Abstract

The invention relates to a device and a method for deep denitrifying by enhancing of endogenous denitrification and coupling with low-DO (dissolved oxygen) nitration with energy-saving and consumption-decreasing effects, and belongs to the field of biological treatment of sewage. The starting and maintaining of short-process nitration reaction cannot be easily realized under the low-DO condition, the content of C / N (carbon / nitrogen) in the urban domestic sewage is lower, the denitrifying carbon sources in the later period are not enough due to consumption of the organic matters in raw water under the aeration condition, and the water effluent quality cannot be easily ensured, so that the method for deep denitrifying via nitration reaction under the low DO condition and enhancing of endogenous denitrification under the anaerobic / anoxia alternative running environment is provided. The device and the method have the advantages that the whole-process nitration are realized by low-oxygen aeration, the organic matters are stored as the inner carbon source PHA by DGAOs (denitrified glycogen accumulating organisms) to realize the endogenous denitrification, and then the urban domestic sewage is performed with deep denitrification; the aeration amount is reduced, the energy consumption is decreased, the organic matters in the raw water are fully utilized, the enough carbon source is provided for the denitrification reaction without adding the carbon source, and the higher water effluent quality is ensured.

Description

technical field [0001] The invention relates to a device and method for energy-saving and consumption-reducing enhanced endogenous denitrification coupled with low DO nitrification deep denitrification, belonging to the technical field of sewage biological treatment. It will perform nitrification reaction under low DO conditions, and use denitrifying polysaccharide bacteria (DGAOs) to store organic matter in raw water as an internal carbon source for endogenous denitrification in an anaerobic / anoxic alternate operating environment , to save aeration, save energy and reduce consumption, and make full use of organic matter in raw water to achieve deep denitrification of low C / N urban domestic sewage. Background technique [0002] In order to solve the problem of water eutrophication, it is necessary to carry out deep denitrification treatment on urban domestic sewage to reduce the concentration of nitrogen in it, and discharge it after reaching the national first-class A disch...

AI Technical Summary

Problems solved by technology

However, the start-up and maintenance of short-cut nitrification under low DO conditions have always been the bottleneck of the process, and it is necessary to control the temperature of the reaction system, SRT, DO, pH, substrate concentration, etc. in real time or add NOB inhibitors to ensure its success Stable operation, which brings a lot of inconvenience to practical application

Images