Completely autotrophic nitrogen removal over nitrite granular sludge starting method for treating urban domestic sewage

Abstract

The invention discloses a completely autotrophic nitrogen removal over nitrite granular sludge starting method specially used for treating urban domestic sewage, belonging to the field of water environment restoration and regeneration. Back-washed sludge of a completely autotrophic nitrogen removal over nitrite process biological filter column is inoculated, under the conditions of high temperature and high ammonia nitrogen, granular sludge is gradually cultivated under the action of mechanical agitation and aeration simultaneously, afterwards, the mass concentration of water distribution total nitrogen and reaction time are constantly reduced to enhance the cultivation of the granular sludge, and by changing the water quality, the treatment of the urban domestic sewage is finally achieved. After 140 cycles, the total nitrogen removal load reaches 0.9 kg?M<-3>?d<-1>, the sludge volume average particle size reaches 1052.49 mu m, and the urban domestic sewage with total nitrogen mass concentration being 65+ / -10 mg?L<-1> can be treated, so that the effluent quality meets the first class standard A; the completely autotrophic nitrogen removal over nitrite granular sludge starting method can be used for starting a reactor for cultivating sequencing batch type granular sludge for treating the urban domestic sewage.

Description

technical field [0001] The invention belongs to the field of water environment restoration and regeneration. In particular, it relates to a method for starting the whole process autotrophic denitrification (CANON) granular sludge used for treating normal temperature and low ammonia nitrogen urban domestic sewage. Background technique [0002] The problem of water resources is an important factor restricting social development. my country is rich in total water resources, but the per capita fresh water resources are only 28% of the world average. Due to the increasing unreasonable discharge of industrial and agricultural sewage, the quality of limited water resources has deteriorated. At the same time, the phenomenon of waste of water resources has become increasingly serious, making the insufficient fresh water resources more and more precious. In sewage, nitrogen pollution is one of the important factors of water pollution. Nitrogen pollution problems exist in urban domes...

AI Technical Summary

Problems solved by technology

In the existing granular sludge research, the continuous operation has achieved certain research results, while the intermittent operation has the problems of long particle formation time, low total nitrogen removal rate, uneven mixing, and difficulty in increasing the total nitrogen removal load.

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