Selenium oxyanion inhibition of hydrogenotrophic and acetoclastic methanogenesis |
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| Authors: | Lenz Markus Janzen Niklas Lens Piet N L |
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| Affiliation: | Sub-Department of Environmental Technology, Wageningen University, 6700 EV Wageningen, The Netherlands; Institute for Ecopreneurship, University of Applied Sciences, Northwestern Switzerland (FHNW), Gründenstrasse 40, 4132 Muttenz, Switzerland. |
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| Abstract: | Inhibitory effects of selenite and selenate towards hydrogenotrophic and acetoclastic methanogenesis were evaluated in anaerobic toxicity assays. The 50% inhibitory concentration (IC(50)) of both selenium oxyanions was below 6.1x10(-5)M in hydrogenotrophic assays, whereas acetoclastic methanogens were less inhibited: IC(50)=8.3x10(-5)M and 5.5x10(-4)M for selenite and selenate, respectively. Selenite completely inhibits methanogenesis from both substrates tested at concentrations 10(-3)M selenite, while only marginal methanogenic activities occur at equimolar concentrations of selenate. Selenite becomes irreversibly inhibitory upon a single exposure, whereas selenate inhibits methanogens upon repeated exposure. Consequently, methane recovery can be seriously hampered or even impossible during anaerobic treatment of highly selenium contaminated waste streams. |
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