期刊
WATER RESEARCH
卷 44, 期 1, 页码 85-96出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2009.09.009
关键词
Biofilm; Denitrification; Membrane; Methane; Methanotrophs; Nitrate
资金
- MEXT through Special Coordination Funds
- MEXT through the Monbukagakusho scholarship
Aerobic methanotrophs can contribute to nitrate removal from contaminated waters, wastewaters, or landfill leachate by assimilatory reduction and by producing soluble organics that can be utilized by coexisting denitrifiers. The goal of this study was to investigate nitrate removal and biofilm characteristics in membrane biofilm reactors (MBfR) with various supply regimes of oxygen and methane gas. Three MBfR configurations were developed and they achieved significantly higher nitrate removal efficiencies in terms of methane utilization (values ranging from 0.25 to 0.36 mol N mol(-1) CH4) than have previously been observed with suspended cultures. The biofilm characteristics were investigated in two MBfRs with varying modes of oxygen supply. The biofilms differed in structure, but both were dominated by Type I methanotrophs growing close to the membrane surface. Detection of the nitrite reductase genes, nirS and nirK, suggested genetic potential for denitrification was present in the mixed culture biofilms. (C) 2009 Elsevier Ltd. All rights reserved.
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