engleski

Sequence batch reactor application for efficient wastewater treatment of the city of Osijek and associated industries

Chemical wastewater quality of the city Osijek and associated industries indicate low organic impurities of the above-mentioned collective water that rang from 320 to 390 mg of oxygen per litter: expressed as COD value. Ammonia nitrogen in mentioned collective wastewater range from 38 to 56 mg per litter and phosphorus from 6 to 10 mg per litter. This is unfavorable ratio of organic ingredients against ingredients with nitrogen and phosphorus for implementation of classic biological process of nitrification and denitrification with phosporus removal. In such wastewater pattern, active sludge weakly procreates and an appearance of filament bacteria is common that sludge floating, thus survival of nitrogenic autotrophic bacteria responsible for nitrogen components removal is low (rinsing out of processing system) Since European directive demand for low concentration of nitrogen and phosphorus in treated wastewater and its ready quality, the activity of mixed bacteria culture selected has been investigated for efficient treatment of collective wastewater of city Osijek and associated industries. Selected bacteria culture is in a form granule that consists of autotrophic and heterotrophic bacteria. By use of SB (sequence batch) reactor in temperature range from 15 to 25 degree centigrade and retention time from 4 to 8 hours the following quality of wastewater has been achieved: pH 7.2-7.4 ; COD 28-35 mg O2 ; BOD 15-2235 mg O2/l ; N-NH4 ; P-PO4. These results have been achieved by use of steady of biomass granule of mixed quality. As additional source of carbon for the process of denitrification, wastewater from the sugar production has been proven successful.

sequence batch reactor; industrial wastewater

nije evidentirano