title: Performance of an anaerobic bioreactor with biomass recycling, continuously removing COD and sulphate from industrial wastes.
abstract: A 30-l anaerobic bioreactor with biomass recycling was used to provide a continuous reduction in sulphate and a continuous COD removal from wastewater, which consisted of the effluent from an industrial pig fattening farm, enriched with technical FeSO(4) x 7H(2)O, a waste product from ferrous metallurgy. The concentrations of sulphate and COD in the wastewater amounted to 2.73 g l(-1) and 3.15 g l(-1), respectively. The HRT (hydraulic retention time) of 10-1.7d produced an extent of sulphate and COD reduction which totalled 98% and 88%, respectively. When the HRT was further shortened, the efficiency of reduction in sulphate and COD decreased. The maximum removal rate constants for both the pollutants, calculated by means of a modified Stover-Kincannon model, were 80.9 g COD l(-1)d(-1) and 41.8 g SO(4)(2-)l(-1)d(-1), the values of the saturation constants being 91.582 g COD l(-1)d(-1) and 42.398 g SO(4)(2-)l(-1)d(-1).
authors.affiliation: Institute of Environmental Protection, Division in Wroclaw, Wrocław, Poland.
authors.forename: K
authors.initials: K
authors.lastname: Kosińska
authors.forename: T
authors.initials: T
authors.lastname: Miśkiewicz
mesh_terms: D019149:Bioreactors / Q000382:microbiology*; D003198:Computer Simulation; D017076:Computer-Aided Design; D045285:Desulfovibrio desulfuricans / Q000378:metabolism*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008954:Models, Biological; D010100:Oxygen / Q000378:metabolism*; D013431:Sulfates / Q000302:isolation & purification / Q000378:metabolism*
chemical_list: D013431:Sulfates; D010100:Oxygen