Process for disposing of waste water

Details Process for disposing of waste water Process for disposing of waste water

1995-01-20

1996-07-02

Wyse, Thomas G.

Liquid purification or separation

Processes

Treatment by living organism

210621, 210631, 210903, 210906, C02F 330

Patent

active

055318967

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), Coumoyer et al.
patent: 5372720 (1994-12-01), Jonsson

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