Method for starting and efficiently operating flocculent sludge and granular sludge coexisting autotrophic nitrogen removal system

Abstract

The invention provides a method for starting and efficiently operating a flocculent sludge and granular sludge coexisting autotrophic nitrogen removal system. The method comprises the following steps: firstly, inoculating a sludge from partial nitrification and from an anaerobic ammonium oxidation reactor, gradually increasing the concentration of influent ammonia nitrogen under the condition of intermittent aeration, starting, and changing the aeration mode into a continuous aeration mode by shortening the time of the anaerobic stage, so as to start a one-step autotrophic nitrogen removal system. After the starting is successful, a stable microbial community structure is created through a method of controlling the proportion of the flocculent sludge and the granular sludge, and the reaction period is adjusted according to the operation condition of the system to achieve efficient nitrogen removal of the system. The starting mode provided by the invention is fast and simple, the created system operates stably and efficiently, and the method is of important reference significance for the operation of the one-step autotrophic nitrogen removal system and other flocculent sludge and granular sludge coexisting systems.

Description

technical field [0001] The invention belongs to the field of sewage biological denitrification, and in particular relates to a start-up and high-efficiency operation method of an autotrophic denitrification system in which flocculent sludge and granular sludge coexist. Background technique [0002] With the rapid development of my country's economy, water pollution is becoming more and more serious. Nitrogen is the main pollutant of eutrophication and has a great impact on the water environment. At present, urban sewage treatment plants mostly use A 2 / O, oxidation ditch and other denitrification processes. However, because the traditional denitrification process needs to add an organic carbon source, it consumes a lot of alkalinity and energy. [0003] Autotrophic denitrification refers to the oxidation of ammonia nitrogen into nitrite nitrogen by ammonia oxidizing bacteria (AOB), and the conversion of nitrite nitrogen and remaining ammonia nitrogen produced by AOB into n...

AI Technical Summary

Problems solved by technology

However, at this stage, due to the long start-up period of the whole autotrophic denitrification system and the complex structure of the bacterial group, it is difficult to achieve stable and efficient operation, which hinders the application and development of this process in practice.

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