Electricity generation by anaerobic bacteria and anoxic sediments from hypersaline soda lakes |
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Authors: | Laurence G Miller Ronald S Oremland |
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Institution: | (1) U.S. Geological Survey (USGS), MS/480, 345 Middlefield Rd., Menlo Park, CA 94025, USA |
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Abstract: | Anaerobic bacteria and anoxic sediments from soda lakes produced electricity in microbial fuel cells (MFCs). No electricity
was generated in the absence of bacterial metabolism. Arsenate respiring bacteria isolated from moderately hypersaline Mono
Lake (Bacillus selenitireducens), and salt-saturated Searles Lake, CA (strain SLAS-1) oxidized lactate using arsenate as the electron acceptor. However,
these cultures grew equally well without added arsenate using the MFC anode as their electron acceptor, and in the process
oxidized lactate more efficiently. The decrease in electricity generation by consumption of added alternative electron acceptors
(i.e. arsenate) which competed with the anode for available electrons proved to be a useful indicator of microbial activity
and hence life in the fuel cells. Shaken sediment slurries from these two lakes also generated electricity, with or without
added lactate. Hydrogen added to sediment slurries was consumed but did not stimulate electricity production. Finally, electricity
was generated in statically incubated “intact” sediment cores from these lakes. More power was produced in sediment from Mono
Lake than from Searles Lake, however microbial fuel cells could detect low levels of metabolism operating under moderate and
extreme conditions of salt stress. |
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Keywords: | Hypersaline Microbial fuel cell Electricity Arsenate |
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