Liquid purification or separation – Recirculation – Serially connected distinct treating or storage units
Patent
1992-07-13
1995-04-18
Wyse, Thomas
Liquid purification or separation
Recirculation
Serially connected distinct treating or storage units
210202, 210219, 210259, C02F 330
Patent
active
054075661
ABSTRACT:
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 CO.sub.2. 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.
REFERENCES:
patent: 3764523 (1973-10-01), Stankewich, Jr.
patent: 4460470 (1984-07-01), Reimann
patent: 4894162 (1990-01-01), Cournoyer et al.
Shimizu Tatsuo
Tambo Norihito
Shimizu Tatsuo
Tambo Norihito
Tsukishima Kikai Co., Ltd.
Wyse Thomas
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