C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 3/28 (2006.01) C02F 3/30 (2006.01) C02F 3/04 (2006.01)
Patent
CA 2337568
Provided step-by-step scheme for conversion of conventional STP to mainly anaerobic treatment of raw sewage without major facility modification. Part of sludge from conventional anaerobic digester is mired into raw sewage at the entrance of STP, flows through feeding pumps and pipes, spiral sand trap, and settles in clarifier together with primary sludge. Adsorbed dissolved/colloidal organic molecules is digested in staged anaerobic digester at favorable temperature. Clarified effluent is polished in aerobic trickling filter, and washed out aerobic biomass is settled in secondary clarifier and anaerobically stabilized in separate digester.
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