Abstract

Complete biodegradation and mineralization of pentachlorophenol (PCP), a priority pollutant in water, is challenging for water treatment. In this study, a hydrogen (H2)-based membrane biofilm reactor (MBfR) was applied to treat PCP, along with nitrate and sulfate, which often coexist in contaminated groundwater. Throughout 120-days of continuous operation, almost 100% of up to 10 mg/L PCP was removed with minimal intermediate accumulation and in parallel with complete denitrification of 20 mg-N/L nitrate. PCP initially was reductively dechlorinated to phenol, which was then mineralized to CO2 through pathways that began with aerobic activation via monooxygenation by Xanthobacter and anaerobic activation via carboxylation by Azospira and Thauera. Sulfur cycling induced by SO4 2− reduction affected the microbial community: The dominant bacteria became sulfate-reducers Desulfomicrobium, sulfur-oxidizers Sulfuritalea and Flavobacterium. This study provides insights and a promising technology for bioremediation of water contaminated with PCP, nitrate, and sulfate.

Original languageEnglish (US)
Pages (from-to)134-144
Number of pages11
JournalWater Research
Volume144
DOIs
StatePublished - Nov 1 2018

Fingerprint

Dechlorination
PCP
Biofilms
dechlorination
biofilm
Nitrates
hydrogen
mineralization
membrane
Membranes
Hydrogen
Sulfur
Chemical activation
Carboxylation
sulfate
nitrate
Bioremediation
Denitrification
Biodegradation
Water treatment

Keywords

  • Aromatic ring activation
  • Dechlorination
  • Hydrogen (H)
  • Membrane biofilm reactor (MBfR)
  • Pentachlorophenol (PCP)
  • Sulfur cycling

ASJC Scopus subject areas

  • Ecological Modeling
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution

Cite this

Complete dechlorination and mineralization of pentachlorophenol (PCP) in a hydrogen-based membrane biofilm reactor (MBfR). / Long, Min; Ilhan, Zehra Esra; Xia, Siqing; Zhou, Chen; Rittmann, Bruce.

In: Water Research, Vol. 144, 01.11.2018, p. 134-144.

Research output: Contribution to journalArticle

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AU - Rittmann, Bruce

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