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Performance and Microbial Community Analysis of an Electrobiofilm Reactor for Chelated-NO Removal Enhanced by Ferrous-EDTA
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  • Nan Liu,
  • yingying Li,
  • Dujuan Ouyang,
  • Changyong Zou,
  • Wei Li,
  • Jihong Zhao,
  • jixiang li,
  • wenjuan wang,
  • Jiajun Hu
Nan Liu
Zhengzhou University of Light Industry
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yingying Li
Zhengzhou University of Light Industry
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Dujuan Ouyang
Zhengzhou University of Light Industry
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Changyong Zou
Zhengzhou University of Light Industry
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Wei Li
Zhejiang University
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Jihong Zhao
Henan Radio and TV University
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jixiang li
Chinese Academy of Sciences
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wenjuan wang
Chinese Academy of Sciences
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Jiajun Hu
Shanghai University
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Abstract

The biological reduction of ferrous ethylenediaminetetraacetic acid (EDTA-FeII-NO and EDTA-FeIII) is an important process in integrated electrobiofilm reduction method, and this method has been regarded as a promising alternative for removing NOx from industrial boiler flue gas. EDTA-FeII-NO and EDTA-FeIII are crucial substrates that should be biologically reduced at a high rate. However, they would inhibit one another’s reduction processes when they are present together, which might limited the further promotion of this integrated method. In this study, an integrated electrobiofilm reduction system with high reduction rate of EDTA-FeII- NO and EDTA-FeIII was established. The microbial communities in electrobiofilms were mainly studied to analyze their changes during the reduction of these two substrates under different conditions. It presents a better performance of substrates- resistance shock loading and high microbial diversities compared with the conventional chemical absorption-biological reduction system. High-throughput sequencing analysis showed that the changes in concentrations of EDTA-FeII-NO and EDTA-FeIII significantly impacted the genera of the microbial community. Alicycliphilus, Enterobacteriaceae and Raoultella were found to be the dominant genera (>25%, respectively) involved in EDTA-FeII-NO reduction. As an EDTA-FeIII reducing bacteria, Chryseobacterium can endure shock loading of substrates. Ochrobactrum can reduce nitrate using electrons and exhibited better stability under shock loading. Furthermore, higher microbial diversity and stable reactor operation could be achieved when the concentrations of EDTA-FeII-NO and EDTA-FeIII approached the same value.

Peer review status:POSTED

19 Jun 2020Submitted to Biotechnology and Bioengineering
19 Jun 2020Assigned to Editor
19 Jun 2020Submission Checks Completed