Reductive Transformation of p-chloronitrobenzene in the upflow anaerobic sludge blanket reactor coupled with microbial electrolysis cell: performance and microbial community

Xiangyang Xu, Junjie Shao, Mengyan Li, Kaituo Gao, Jie Jin, Liang Zhu

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

A microbial electrolysis cell (MEC) combined with an upflow anaerobic sludge blanket (UASB) reactor was operated to degrade p-chloronitrobenzenes (p-ClNB) effectively. The results indicated that p-ClNB was transformed to p-chloroaniline (p-ClAn) and then reduced via dechlorination pathways. In the MEC-UASB coupled system, p-ClNB, p-ClAn removal efficiency and dechlorination efficiency reached 99.63 ± 0.37%, 40.39 ± 9.26% and 32.16 ± 8.12%, respectively, which was significantly improved in comparison with the control UASB system. In addition, the coupled system could maintain appropriate pH and promote anaerobic sludge granulation to exert a positive effect on reductive transformation of p-ClNB. PCR-DGGE experiment and 454 pyrophosphate sequencing analysis indicated that applied voltage would significantly influence the succession of microbial community and promote oriented enrichment of the functional bacteria, which could be the underlying reasons for the improved performance. This study demonstrated that MEC-UASB coupled system had a promising application prospect to remove the recalcitrant pollutants effectively.

Original languageEnglish (US)
Pages (from-to)1037-1045
Number of pages9
JournalBioresource Technology
Volume218
DOIs
StatePublished - Oct 1 2016

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

Keywords

  • Chloronitrobenzenes (ClNBs)
  • Dechlorination
  • Microbial community
  • Microbial electrolysis cell (MEC)
  • Upflow anaerobic sludge blanket (UASB)

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