Traditional Culture Encyclopedia - Traditional stories - What is the principle of biological denitrification of sewage?
What is the principle of biological denitrification of sewage?
Biological denitrification can be divided into three steps:
The first step is ammoniation, that is, the organic nitrogen in water is transformed into ammonia nitrogen under the action of ammonifying bacteria. (In the ordinary activated sludge process, ammoniation is very fast, and no special measures are needed. )
The second step is nitrification, that is, under the condition of sufficient oxygen supply, ammonia nitrogen in water is oxidized into nitrite under the action of nitrite bacteria, and then further oxidized into nitrate under the action of nitrate bacteria.
The third step is denitrification, that is, under anoxic or anaerobic conditions, nitrite and nitrate produced by nitrification are reduced to nitrogen under the action of denitrifying bacteria.
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