Journal
WATER RESEARCH
Volume 172, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2020.115512
Keywords
Wastewater treatment plants; Reject water; Ammonium; Methanotrophs; Methylophilus; Bacterial consortium; Biogas
Funding
- Korea Institute of Civil Engineering and Building Technology [20190152-001]
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This study proposes a novel method to directly treat reject water with a high ammonium content, without relying on dilution. The originality of this method resides in leveraging the coordinated action of a methane- and methanol-dependent bacterial consortium and the biogas generated from wastewater treatment facilities. Specifically, ammonium is removed through autotrophic assimilation in the glutamate cycle of methanotrophs and Methylophilus while, simultaneously, methanol generated by methanotrophs is treated through formaldehyde assimilation as Methylophilus undergo the same ribulose monophosphate cycle as methanotrophs. Using this method, the backflow of high-concentration ammonium into the wastewater treatment process was reduced to 59% in a single operation using a sequencing batch reactor at a mean influent concentration of 877.3 mg L-1. However, the removal rate temporarily declined to an average of 37.6% at a concentration of 800 mg L-1 or above, which was imputed to the influence of toxic intermediates. (C) 2020 The Authors. Published by Elsevier Ltd.
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