Journal
WATER RESEARCH
Volume 130, Issue -, Pages 224-233Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2017.11.063
Keywords
Biological manganese oxidation; Downflow hanging sponge (DHS) reactor; Methane oxidation; Minor metal removal; Biomass-associated products (BAPS); Utilization-associated products (UAPs)
Funding
- Japan Society for the Promotion of Science [JP23241029]
- Environment Research and Technology Development Fund of the Ministry of the Environment, Japan [2-3K133004]
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Biogenic manganese oxide (BioMnO(x)) can efficiently adsorb various minor metals. The production of BioMnOx in reactors to remove metals during wastewater treatment processes is a promising biotechnological method. However, it is difficult to preferentially enrich manganese-oxidizing bacteria (MnOB) to produce BioMnO(x) during wastewater treatment processes. A unique method of cultivating MnOB using methane-oxidizing bacteria (MOB) to produce soluble microbial products is proposed here. MnOB were successfully enriched in a methane-fed reactor containing MOB. BioMnO(x) production during the wastewater treatment process was confirmed. Long-term continual operation of the reactor allowed simultaneous removal of Mn(II), Co(II), and Ni(II). The Co(II)/Mn(II) and Ni(II)/Mn(II) removal ratios were 53% and 19%, respectively. The degree to which Mn(II) was removed indicated that the enriched MnOB used utilization-associated products and/or biomass-associated products. Microbial community analysis revealed that methanol-oxidizing bacteria belonging to the Hyphomicrobiaceae family played important roles in the oxidation of Mn(II) by using utilization-associated products. Methane-oxidizing bacteria were found to be inhibited by MnO2, but the maximum Mn(II) removal rate was 0.49 kg m(-3) d(-1). (C) 2017 Elsevier Ltd. All rights reserved.
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