摘要 |
<p>Waste water is disposed in a flocculation mixing tank 1, an anaerobic tank 2 and an aerobic tank 3 connected in series. First, a dephosphorization flocculating agent and, if necessary, a polymeric flocculating agent are added to waste water in order to produce and grow phosphorus-containing flocs therein. Then, to the water is added a recycling solution from an aerobic tank 3, said solution containing nitrates and nitrites. The mixture water is charged in an anaerobic tank 2 until microbially decomposable components (herein referred to BOD components), nitrates and nitrites are anaerobically and microbially decomposed and gas is produced. In the aerobic tank 3 is charged a supernatant solution from the anaerobic tank 2, said solution containing ammonium compound and BOD components, to nitrates, nitrites and CO2. At least a part of supernatant solution containing the nitrates and nitrites is recycled to the anaerobic tank 2. Solids discharged from the anaerobic tank 2 and the aerobic tank 3 are wasted. Nitrogen compounds and phosphorus compounds as well as BOD components are removed from waste water. <IMAGE></p> |
申请人 |
TAMBO, NORIHITO, SAPPORO, HOKKAIDO, JP;SHIMIZU, TATSUO, SAPPORO, HOKKAIDO, JP;TSUKISHIMA KIKAI CO. LTD., TOKYO, JP |
发明人 |
TAMBO, NORIHITO, SAPPORO-SHI, HOKKAIDO 063, JP;SHIMIZU, TATSUO, NISHI-KU, SAPPORO-SHI, HOKKAIDO 063, JP |