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Hexavalent chromium (Cr(VI)) is a mutagen and carcinogen that is a significant concern in water and wastewater. A simple and non-hazardous means to remove Cr(VI) is bioreduction to Cr(III), which should precipitate as Cr(OH) 3(s) . Since Cr(VI)-reducing bacteria can use hydrogen (H 2 ) as an electron donor, we tested the potential of the H 2 -based membrane biofilm reactor...
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