Direct Cr (VI) bio-reduction with organics as electron donor by anaerobic sludge
Chemical Engineering Journal（2017）
Abstract
•Highest direct Cr(VI) bio-reduction activity is achieved at pH 8.0.•Direct Cr(VI) bio-reduction activity decreased with increased Cr(VI) concentration.•Direct Cr(VI) bio-reduction rate is slower than the indirect one.•Direct Cr(VI) bio-reduction at 1.0mg Cr (VI)/L/h is demonstrated in UASB reactor.•Desulfovibrio, Ochrobactrum and Anaerovorax cause direct Cr(VI) bio-reduction.
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Key words
Biological Cr (VI) removal,Direct Cr (VI) bio-reduction,pH,Microbial analysis,Toxicity
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