Reduction of bromate to bromide coupled to acetate oxidation by anaerobic mixed microbial cultures.
臭氧
氧化还原
环境化学
溴
还原电位
核化学
作者
C.G. van Ginkel,A. M. van Haperen,B. van der Togt
出处
期刊:Water Research [Elsevier] 日期:2005-01-01卷期号:39 (1): 59-64被引量:40
标识
DOI:10.1016/j.watres.2004.09.005
摘要
Bromate, a weakly mutagenic oxidizing agent, exists in surface waters. The biodegradation of bromate was investigated by assessing the ability of mixed cultures of micro-organisms for utilization of bromate as electron acceptor and acetate as electron donor. Reduction of bromate was only observed at relatively low concentrations (<3.0 mM) in the absence of molecular oxygen. Under these conditions bromate was reduced stoichiometrically to bromide. Unadapted sludge from an activated sludge treatment plant and a digester reduced bromate without lag period at a constant rate. Using an enrichment culture adapted to bromate, it was demonstrated that bromate was a terminal electron acceptor for anaerobic growth. Approximately 50% of the acetate was utilized for growth with bromate by the enrichment culture. A doubling of 20 h was estimated from a logarithmic growth curve. Other electron acceptors, like perchlorate, chlorate and nitrate, were not reduced or at negligible rates by bromate-utilizing microorganisms.