Method for quickly starting completely autotrophic nitrogen removal over nitrite process on sewage on conditions of constant temperature and low ammonia nitrogen

Abstract

The invention discloses a method for quickly starting a completely autotrophic nitrogen removal over nitrite process on sewage on the conditions of constant temperature and low ammonia nitrogen and belongs to the field of city sewage treatment and reutilization. The completely autotrophic nitrogen removal over nitrite (CANON) process is started in a biological filter tank reactor and comprises the following steps: firstly, nitrifying sludge by using an inoculating part, and performing aerobic nitrification start with sufficient oxygen supply to build a nitrosobacteria-dominated and nitrobacterium-dominated microorganism system; inhibiting the growth of nitrobacterium through intermittent aeration / anaerobism and enriching anaerobic ammonium oxidation bacteria; and finally, performing continuous aeration, controlling ammonia nitrogen to be oxidized to a stage of nitrous acid through restrictive oxygen supply, and optimizing microenvironment where nitrosobacteria and anaerobic ammonium oxidation bacteria coexist so as to successfully start the CANON process. By using the method, the problem that the growth enrichment of the anaerobic ammonium oxidation bacteria is slower for a long term can be solved; moreover, the starting way is simple and feasible, and the difficulty of the start of a single-stage autotrophic nitrogen removal system is reduced; and therefore, a method is provided to start the CANON process on stimulated waste water on the conditions of constant temperature and low ammonia nitrogen.

Description

technical field [0001] The invention belongs to the field of urban domestic sewage treatment and regeneration. In particular, it relates to a rapid start-up method specially used for the biofilm whole process autotrophic denitrification (CANON) process at normal temperature and low ammonia nitrogen level. Background technique [0002] With the growth of economic level and the intensification of human activities, water pollution is becoming more and more serious, among which nitrogen pollution is a major hazard, which has a great impact on the natural environment and human health. At present, for the removal of nitrogen, urban sewage treatment plants mostly adopt the denitrification process based on the traditional nitrification and denitrification principle, such as A 2 / O, oxidation ditch, etc. Although these processes have a certain effect on nitrogen removal, they need to add organic carbon sources in the process, consume a lot of alkalinity and energy, and have high in...

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Problems solved by technology

However, at present, the CANON process is still in the stage of experimental research. At the beginning of the construction of the process, artificial water distribution with high temperature and high ammonia nitrogen or industrial wastewater such as digested sludge dehydration liquid and landfill leachate were often used.

The research conclusions of many researchers show that the stable anammox reaction in the CANON reactor is an important guarantee for the successful start-up and even stable operation of the process. However, the anammox bacteria have a longer growth cycle and a lower growth rate ( =0.0027h -1 , the doubling time is 10.6d) which limits its application and development in practical engineering

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