| 摘要 |
PROBLEM TO BE SOLVED: To provide a new removal method of nitrogen and phosphorus, and a removal apparatus. SOLUTION: The biological nitrogen and phosphorus removal process (A<SB>2</SB>O method) comprises a primary settling tank, an anaerobic tank, anoxic tanks (denitrification tank), an aerobic tank, and a final settling tank, and circulates active sludge of a terminal part of the aerobic tank to the anoxic tank (denitrification tank). A second anoxic tank is provided at a rear stage of the aerobic tank, and the activated sludge of the terminal part of the second anoxic tank is circulated to the preceding anoxic tank (denitrification tank), and circulation of the activated sludge from the aerobic tank to the preceding anoxic tank (denitrification tank) is stopped. COPYRIGHT: (C)2007,JPO&INPIT
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