Facile reduction of arsenate in methanogenic sludge

Biodegradation
Jim A FieldA Jay Gandolfi

Abstract

Due to the recent enactment of a stricter drinking water standard for arsenate, large quantities of arsenate-laden drinking water residuals will be disposed in municipal landfills. The objective of this study was to determine the role of methanogenic consortia on the conversion of arsenate. Methanogenic conditions commonly occur in mature municipal solid waste landfills. The results indicate the rapid and facile reduction of arsenate to arsenite in methanogenic sludge. Endogenous substrates in the sludge were sufficient to support the reductive biotransformation. However the rates of arsenate reduction were stimulated by the addition of exogenous electron donating substrates, such as H2, lactate or a mixture of volatile fatty acids. A selective methanogenic inhibitor stimulated arsenate reduction in microcosms supplied with H2, suggesting that methanogens competed with arsenate reducers for the electron donor. Rates of arsenate reduction increased with arsenate concentration up to 2 mM, higher concentrations were inhibitory. The electron shuttle, anthraquinone-2,6-disulfonate, used as a model of humic quinone moieties, was shown to significantly increase rates of arsenate reduction at substoichiometric concentrations. The prese...Continue Reading

Citations

Sep 4, 2004·Applied and Environmental Microbiology·Reyes Sierra-AlvarezJim A Field
Jan 7, 2016·Environmental Science & Technology·Adriana Ramos-RuizReyes Sierra-Alvarez
Jan 30, 2016·Water, Air, and Soil Pollution·Lucia Rodriguez-FreireJames A Field
Jun 9, 2009·Biotechnology Advances·Frank P Van der Zee, Francisco J Cervantes
Jun 18, 2014·Environmental Science & Technology·Lin ShiZhen-Hu Hu
Jul 17, 2018·Waste Management·Adriana Ramos-RuizReyes Sierra-Alvarez
May 25, 2006·Environmental Science & Technology·Irail CortinasReyes Sierra-Alvarez

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