Patent ID: 6019900
Filing Date: 2000-02-01
Classification: C02F,Y10S

Abstract:
A process for the single stage denitrification and anaerobic digestion of an aqueous waste stream containing organic materials and nitrate ion of at least about 500 mg/L and having a chemical oxygen demand of at least about 2,000 mg/L, said process comprising incubating said aqueous waste stream with a digestion medium comprising denitrifying bacteria, yeast extract, NiCl.sub.2 and additional nutrients selected from the group consisting of water-soluble salts of Fe, Ca, Co, Mo, K, Mg, and P, at a pH of from about 6.0 to about 8.5, in an anaerobic environment, for a period of time sufficient to lower nitrate ion concentration by at least about 80% and to lower chemical oxygen demand by at least about 60%.