Journal
WATER RESEARCH
Volume 171, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2019.115397
Keywords
Nitrate; Competition; Perchlorate reductase; Reversible inhibition; Membrane batch biofilm reactor
Funding
- National Natural Science Foundation of China [21577123, 51878596]
- National Key Technology RD Program [2017ZX07206-002]
- Natural Science Funds for Distinguished Young Scholar of Zhejiang Province [LR17B070001]
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Nitrate (NO3-) affected perchlorate (ClO4-) reduction in a membrane batch biofilm reactor (MBBR), even though the electron donor, CH4, was available well in excess of its demand. For example, the perchlorate-reduction rate was 1.7 mmol/m(2)-d when perchlorate was the sole electron acceptor, but it dropped to 0.64 mmol/m(2)-d when nitrate also was present. The perchlorate-reduction rate returned to 1.60 mmol/m2-d after all nitrate was consumed. Denitrotisoma and Azospirillum were main genera involved in perchlorate and nitrate reduction, and both could utilize NO3- and ClO4- as electron acceptors. Results of the reverse transcription-polymerase chain reaction (RT-PCR) showed that transcript abundances of nitrate reductase (narG), nitrite reductase (nirS), and perchlorate reductase (perA) increased when the perchlorate and nitrate concentrations were higher. Specifically, perA transcripts correlated to the sum of perchlorate and nitrate, rather than perchlorate individually. Analysis based on Density Functional Theory (DFT) suggests that bacteria able to utilize both acceptors, preferred NO3- over ClO4- due to nitrate reduction having lower energy barriers for proton and electron transfers. (C) 2019 Elsevier Ltd. All rights reserved.
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