Open AccessPerformance of an autotrophic denitrification process with mixed electron donors and a functional microbial community
Author(s) -
Xianxin Luo,
Junfeng Su,
Han Liu,
Tinglin Huang,
Li Wei,
Jiawei Nie,
Hanyu Gao,
Dongpeng Li
Publication year - 2018
Publication title -
water science and technology water supply
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.318
H-Index - 39
eISSN - 1607-0798
pISSN - 1606-9749
DOI - 10.2166/ws.2018.088
Subject(s) - nitrate , denitrification , electron acceptor , electron donor , nitrite , leachate , hydraulic retention time , chemistry , autotroph , molar ratio , environmental chemistry , nuclear chemistry , catalysis , environmental engineering , environmental science , bacteria , nitrogen , organic chemistry , biology , sewage treatment , genetics
A moving bed biofilm reactor (MBBR) using Mn(II) and Fe(II) as mixed electron donors was designed for nitrate removal. The optimal state, as determined by response surface methodology, was an Fe(II):Mn(II) molar ratio of 0.62, electron donor:electron acceptor molar ratio of 2.62 and hydraulic retention time of 10.88 h. Subsequently, the MBBR was applied to groundwater treatment and demonstrated a final nitrate-N removal efficiency of 99.5% with the nitrite-N accumulation rate of 0.0706 mg-N·L −1 ·h −1 . Furthermore, high-throughput sequencing was employed to characterize bacterial communities in the MBBR. Results showed that the genera of Pseudomonas and Acinetobacter may play a contribution to the nitrate removal.
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