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SYSTEM FOR REMOVING NITROGEN AND PHOSPHORUS IN DRAIN AND REMOVING METHOD
SYSTEM FOR REMOVING NITROGEN AND PHOSPHORUS IN DRAIN AND REMOVING METHOD
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机译:排水中氮磷去除系统及去除方法
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摘要
PROBLEM TO BE SOLVED: To provide a treating system capable of efficiently removing nitrogen and phosphorus in drain. ;SOLUTION: A drain is treated by providing an oxygen-free biological treating zone 4a at a head and an anaerobic biological treating zone 5 successively, and moreover, alternately arranging plural aerobic biological treating zones 6a and 6b and at least one oxygen-free biological treating zone 4b. A dissolved oxygen and combined oxygen in the drain and sludge are consumed and reduced in the oxygen-free biological treating zone at the head, and a stable and efficient phosphorus releasing is realized in the anaerobic biological treating zone in absolutely oxygen-free state, and the phosphorus in the drain is favorably removed by phosphorus-over-intake at the following aerobic biological treating zone and oxygen-free biological treating zone, and the nitrogen is removed by repetition of nitrification and denitrification.;COPYRIGHT: (C)2000,JPO
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