Integrated effect of goethite and gypsum on the anaerobic conversion of 2，4－dichlorophenol by dehalogenation bacteria
Kong Dianchao，Zhou Yuefei*，Chen Tianhu，Wang Jin，Li Bi
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Laboratory of Nanominerals and Environmental Materials，School of Resources and Environmental Engineering，Hefei University of Technology，Hefei，230009，China
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Published
2018-01-31
Issue Date
2018-01-31
Abstract
As respective representatives of iron oxides and sulfate minerals，goethite and gypsum were added into experimental systems with variable ratios to investigate their synergic effect on the anaerobic microbial conversion of 2，4－dichlorophenol(2，4－DCP)．The results showed that no 2，4－DCP was adsorbed by the two minerals.Mass balance analysis noted that only the conversion of 2，4－DCP to 4－chlorophenol(4－CP)occurred in all experiments.In experiments without excessive carbon source，the conversion of 2，4－DCP was strongly restrained at the addition of goethite and gypsum，unrelated to mineral ratios.In experiments with the addition of sodium acetate，inhibitory effects by the two minerals on the conversion of 2，4－DCP were related to the ratio of goethite to gypsum，as the ratio decreased，the degradation rate and degree of 2，4－DCP declined gradually.Further analysis indicated that SO2－4 released from the gypsum restrained the conversion of 2，4－DCP by these mechanisms：(1)competing with dechlorination bacteria for organic substrates；(2)decreasing the anaerobic environmental redox potential and generating more S2－，which would be unfavorable for the growth of dechlorination bacteria.S2－ could be partly fixed as iron sulfide by goethite，which would increase the systems’ redox potential and improve the growth conditions for dehalogenation bacteria.This study suggests that gypsum has potential inhibitory effects on the anaerobic transformation of the halogenated phenols under natural conditions while iron oxides could alleviate these effects to a certain extent.
Kong Dianchao，Zhou Yuefei*，Chen Tianhu，Wang Jin，Li Bi.
Integrated effect of goethite and gypsum on the anaerobic conversion of 2，4－dichlorophenol by dehalogenation bacteria[J]. Journal of Nanjing University(Natural Sciences), 2018, 54(1): 176
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References
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