| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a wastewater treatment apparatus and method which maintain progress of treatment reaction and suppress an increase of total nitrogen concentration and COD concentration while suppressing cost required for wastewater treatment. Ž<P>SOLUTION: The wastewater treatment apparatus which treats wastewater in a treatment tank (a denitrification column 52) with microorganisms has an injection portion 10 which can inject one or both of two alcohols as a nutrient source for the microorganisms into the treatment tank, and a switch control means 22 which, when the nutrient source is switched from one of the two alcohols to the other alcohol, controls the injection portion 10 so that the injection amount of the other alcohol increases as the injection amount of the one of the alcohols decreases. The kind of the alcohols is gradually changed, which gradually acclimates the microorganism to new nutrient source and removes factors, such as a factor weakening the microorganisms. As a result, the progress of the treatment reaction can be maintained to suppress the increase of total nitrogen concentration and COD concentration. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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