Continuous flow low C/N (carbon/nitrogen ratio) municipal wastewater partial nitrification/ anaerobic ammonia oxidation and denitrification nitrogen removal method

Abstract

The invention provides a continuous flow low C / N (carbon / nitrogen ratio) municipal wastewater partial nitrification / anaerobic ammonia oxidation and denitrification nitrogen removal method, and belongs to the field of wastewater. The continuous flow low C / N municipal wastewater partial nitrification / anaerobic ammonia oxidation and denitrification nitrogen removal method is characterized in that firstly municipal wastewater enters an oxygen deficiency denitrification zone of a biological nitrogen removal reactor, heterotrophic denitrifying bacteria fixed on biological stuffing use organic matters in raw water as carbon sources and restore nitrate nitrogen in backflow yielding water to nitrogen, then the wastewater enters an aerobic zone and is subjected to partial nitrification reaction, so that a part of ammonia nitrogen is converted to nitrite nitrogen, afterwards the wastewater enters an oxygen deficiency zone, and anaerobic ammonium oxidation bacteria fixed on the biological stuffing convert the part of ammonia nitrogen and the nitrite nitrogen into nitrogen; and afterwards, the wastewater sequentially enters a subsequent aerobic zone and a subsequent oxygen deficiency zone, so that the effects are repeated, and the purpose of removing the nitrogen in the wastewater is achieved in the end. The continuous flow low C / N municipal wastewater partial nitrification / anaerobic ammonia oxidation and denitrification nitrogen removal method can realize the deep denitrification of low C / N municipal wastewater without addition of an external carbon source and has the characteristics of high nitrogen removal efficiency, low sludge yield and the like.

Description

Technical field: [0001] The invention relates to a continuous flow low C / N urban sewage short-range nitrification / anaerobic ammonia oxidation + denitrification denitrification method, which belongs to the technical field of sewage biological treatment. Background technique: [0002] With the continuous improvement of people's living standards, the discharge of nitrogen and phosphorus in sewage is gradually increasing, and the eutrophication of water body is becoming more and more serious. Biological denitrification of sewage is imperative. In the traditional biological denitrification process, ammonia nitrogen is converted into nitrate nitrogen nitrogen through nitrification, and then nitrate nitrogen nitrogen is reduced to nitrogen gas through denitrification using organic matter as an electron donor, so as to achieve the purpose of removing nitrogen from sewage. The denitrification process is a key step in traditional biological denitrification, and sufficient organic carb...

AI Technical Summary

Problems solved by technology

[0004] The purpose of this invention is to solve the problem that low C / N (COD / TN<3.5) urban sewage is difficult to efficiently denitrify, and proposes a low-C / N urban sewage short-range nitrification / anammox + denitrification deep denitrification Methods

Images