De-nitrification process of double short-cut nitrification-anaerobic ammonia oxidation

Abstract

The invention discloses a de-nitrification process of double short-cut nitrification-anaerobic ammonia oxidation. A partial short-cut nitrification process or a partial short-cut nitrification-de-nitrification process is adopted before an integrated short-cut nitrification-anaerobic ammonia oxidation process; effluent of the partial short-cut nitrification process or the partial short-cut nitrification-de-nitrification process enters a reactor of the integrated short-cut nitrification-anaerobic ammonia oxidation process; the reaction condition of partial short-cut nitrification is controlled through the concentration ratio of ammonia nitrogen NH4<+>-N to nitrite NO2<->-N of partial short-cut nitrification process or partial short-cut nitrification-de-nitrification process effluent; and theconcentration ratio of ammonia nitrogen NH4<+>-N to nitrous nitrogen NO2<->-N in effluent of the partial shortcut nitrification process or effluent of the partial shortcut nitrification-de-nitrification process is adjusted according to the proportion demand of ammonia oxidizing bacteria AOB and anaerobic ammonia oxidizing bacteria AAOB strains in the integrated shortcut nitrification-anaerobic ammonia oxidation process. The technical scheme has the advantages of a two-stage reaction and an integrated reaction, and has the advantages of fast engineering starting, fast AAOB strain multiplication, easy enrichment, high treatment capacity and good system stability.

Description

technical field [0001] The invention belongs to the field of environmental protection engineering biological denitrification, and in particular relates to a two-stage anaerobic ammonium oxidation and an integrated anaerobic ammonium oxidation process. Background technique [0002] A series of high-efficiency and low-consumption combined denitrification processes based on anaerobic ammonium oxidation have attracted much attention, but the technology is not yet mature enough. The stable operation of nitrification in continuous reactors is still a recognized problem. [0003] At present, there are two main types of anammox process, one is a two-stage process, that is, short-cut nitrification and anammox reaction are carried out in two independent reactors; the other is an integrated process, that is, short-cut nitrification and anaerobic ammonium oxidation reaction in the same reactor. [0004] The above two processes have their own advantages and disadvantages. Two-stage pr...

AI Technical Summary

Problems solved by technology

However, the cyclone separator can only retain the mature granular sludge with a large specific gravity by relying on the centrifugal force.

AOB generally exists in the state of flocculent sludge, mature AAOB sludge generally exists in the state of granular sludge, but AAOB often exists in the state of flocculent sludge or fine particle sludge in the early stage of growth, therefore, in the anaerobic ammonia oxidation The use of a cyclone separator at the initial stage of project start-up will cause the flocculent and fine granular AAOB to be washed out of the system together with the flocculent AOB, making it difficult to enrich AAOB, resulting in a long start-up period

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