Journal
MARINE POLLUTION BULLETIN
Volume 117, Issue 1-2, Pages 88-97Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2017.01.075
Keywords
Autotrophic denitrification; Klebsiella sp FC61; Iron cycle; Immobilized systems; Microbial community
Funding
- National Natural Science Foundation of China (NSFC) [51678471]
- National Key Research and Development Project [2016YFC0200706]
- Open Project of State Key Laboratory of Urban Water Resource and Environment
- Harbin Institute of Technology [QA201518]
- Foundation for Creative Research Groups of China [50821002]
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We used three stable reactors to investigate the rates of nitrate removal coupled with iron cycle and the subsequent influence of the reaction on bacterial communities. The iron-reducing bacterium Klebsiella sp. FC61 was immobilized on the reactor columns of the experimental groups B (only Klebsiella) and C (Klebsiella + magnetite). With the fluctuation of Fe2+ to Fe3+ (iron cycle), the average nitrate removal efficiency increased from 73.22% to 93.91% and 86.92% to 97.84% in groups B and C, respectively, as the influent nitrate concentration decreased from 40 to 10 mg/L. However, the average rate of nitrate removal showed the opposite trend (from 2.08 mg/L/h to 0.67 mg/L/h and 2.41 mg/L/h to 0.69 mg/L/h in groups B and C, respectively) as the influent nitrate concentration decreased. Analysis of microbial distribution and community structures indicated that the population of Klebsiella sp. increased in groups B (from 18.21% to 41.21%) and C (from 25.43% to 46.80%) and contributed to the effective removal of nitrate in the reactors. (C) 2017 Elsevier Ltd. All rights reserved.
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