MICROBIOLOGY OF ACTIVATED-SLUDGE TREATING WASTE-WATER CONTAINING NI(II) AND CR(VI)

The species of microorganisms dominating a laboratory-scale once-throu gh activated sludge unit treating simulated wastewater with different influent strengths (650 and 1300 mgl(-1) COD) and containing 5 to 10 m gl(-1) Ni(II) and 1 to 50 mgl(-1) Cr(VI) were identified by standard b iochemical tests. Within this framework, combinations of metals and in fluent COD concentrations were tried. Organisms, namely Proteus rettge ri, Acinetobacter sp., Flavobacterium lutescens, Bacillus cereus var. albolactis, Klebsiella sp., Arthrobacter simplex, and Pseudomonas mend ocina, were identified at different stages of the experiments. Copyrig ht (C) 1996 IAWQ.