Impact Factor:12.2

Affiliation of Author(s):环境与测绘学院

Teaching and Research Group:环境科学系

Journal:Jounal of Hazardous Materials

Funded by:国家自然科学基金青年项目

Key Words:Pyrogenic Carbon; TCE Dehalogenation; Electron Snorkeling

Abstract:Microbial dehalogenation, using obligate and facultative organohalide-respiring bacteria (OHRB), has been widely used to remediate halohydrocarbon-polluted sites. Owing to the scarcity of OHRB, and poor efficiency in H2-mediating interspecies electron transfer, microbial dehalogenation relying on OHRB is easily disturbed by Fe(III), sulfate, and nitrate as electron competitors. In the present study, pyrogenic carbon, featuring electron snorkeling, was introduced into the process of microbial dehalogenation, which facilitated the electron transfer from electro-active microbes to halohydrocarbon, then invigorating dehalogenation. As a consequence, fine dehalogenation of trichloroethene (TCE, as representative halohydrocarbon) was obtained, expressed as the nearly complete diminishment of 150 µmol L–1 TCE and the sequestration of high contents of ethene (72.2–122.3 µmol L–1 within 80 d). Such fine dehalogenation was ascribed to the synergy between pyrogenic carbon and electro-active microbes. Multiple microbes in mixed cultures, including Clostridium sp., Sporanaerobacter, Sedimentibacter, Paraclostridium, and Tissierella, stimulated TCE dehalogenation by providing electrons to pyrogenic carbon. Redox moieties on pyrogenic carbon enabled it to snorkel electrons, which facilitated the electron transfer from electro-active microbes to TCE, consequently invigorating TCE dehalogenation. Such microbial dehalogenation free of OHRB demonstrates the effectiveness of a novel strategy for remediating halohydrocarbon-polluted environments.

Indexed by:Journal paper

Document Code:135903

Discipline:Engineering

Document Type:J

Volume:480

Issue:5

ISSN No.:0304-3894

Translation or Not:no

Date of Publication:2024-09-23

Included Journals:SCI

Links to published journals:https://www.sciencedirect.com/science/article/pii/S0304389424024828

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