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Water research (Oxford), 2022-06, Vol.216, p.118326-118326, Article 118326
2022
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Autor(en) / Beteiligte
Titel
Concurrent anaerobic chromate bio-reduction and pentachlorophenol bio-degradation in a synthetic aquifer
Ist Teil von
  • Water research (Oxford), 2022-06, Vol.216, p.118326-118326, Article 118326
Ort / Verlag
England: Elsevier Ltd
Erscheinungsjahr
2022
Quelle
MEDLINE
Beschreibungen/Notizen
  • •The concurrent Cr(VI) bio-reduction and PCP bio-degradation are realized.•Cr(VI) is reduced to insoluble Cr(III) and PCP is efficiently dechlorinated.•Aquifer chemistry and hydrodynamics affect the proposed bioprocess.•Independent and synergistic mechanisms for microbes are revealed. Chromate [Cr(VI)] and pentachlorophenol (PCP) coexist widely in the environment and are highly toxic to public health. However, whether Cr(VI) bio-reduction is accompanied by PCP bio-degradation and how microbial communities can keep long-term stability to mediate these bioprocesses in aquifer remain elusive. Herein, we conducted a 365-day continuous column experiment, during which the concurrent removals of Cr(VI) and PCP were realized under anaerobic condition. This process allowed for complete Cr(VI) bio-reduction and PCP bio-degradation at an efficiency of 92.8 ± 4.2% using ethanol as a co-metabolic substrate. More specifically, Cr(VI) was reduced to insoluble chromium (III) and PCP was efficiently dechlorinated with chloride ion release. Collectively, Acinetobacter and Spirochaeta regulated Cr(VI) bio-reduction heterotrophically, while Pseudomonas mediated not only Cr(VI) bio-reduction but also PCP bio-dechlorination. The bio-dechlorinated products were further mineralized by Azospira and Longilinea. Genes encoding proteins for Cr(VI) bio-reduction (chrA and yieF) and PCP bio-degradation (pceA) were upregulated. Cytochrome c and intracellular nicotinamide adenine dinucleotide were involved in Cr(VI) and PCP detoxification by promoting electron transfer. Taken together, our findings provide a promising bioremediation strategy for concurrent removal of Cr(VI) and PCP in aquifers through bio-stimulation with supplementation of appropriate substrates.
Sprache
Englisch
Identifikatoren
ISSN: 0043-1354
eISSN: 1879-2448
DOI: 10.1016/j.watres.2022.118326
Titel-ID: cdi_proquest_miscellaneous_2646720237

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