| 摘要 |
PROBLEM TO BE SOLVED: To allow a denitrification rate to be increased when ammonia and nitrous acid are simultaneously denitrified by an anaerobic ammonia oxidizing bacteria by collecting the anaerobic ammonia oxidizing bacteria at high speed and also increase efficiency of waste water treatment. SOLUTION: A waste water treatment apparatus includes an oxygen-free tank 12 for removing an organic matter, a nitrous acid formation tank 14 for forming nitrous acid, an anaerobic ammonia oxidizing tank 16 for anaerobically denitrifying from nitrous acid and ammonia, and a nitrification tank 18 for oxidizing ammonia remaining in treated water in the anaerobic ammonia oxidizing tank. A method for treating waste water is to circulate a part of treated water in the nitrification tank 18 to the oxygen-free tank 12 by a recirculation line 40, remove the organic matter by breathing of nitrous acid or nitric acid in the oxygen-free tank 12, prevent the organic matter from flowing into the anaerobic ammonia oxidizing tank 16, and make a large amount of nitrous acid so as not to flow into the anaerobic ammonia oxidizing tank 12 by diluting with recirculation. COPYRIGHT: (C)2006,JPO&NCIPI
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