Issue 36, 2022

Response of chlorinated hydrocarbon transformation and microbial community structure in an aquifer to joint H2 and O2

Abstract

Hydrogen (H2) and oxygen (O2) are critical electron donors and acceptors to promote the anaerobic and aerobic microbial transformation of chlorinated hydrocarbons (CHCs), respectively. Electrochemical technology can effectively supply H2 and O2 directly to an aquifer. However, the response of CHC transformation and microbial community structure to joint H2 and O2 are still unclear. In this work, microcosms containing different combinations of H2 and O2 were constructed with natural sediments and nine mixed CHCs. The joint H2 and O2 microcosm (H2/O2 microcosm) significantly promoted the biotransformation of trichloroethylene (TCE), trans-dichloroethene (tDCE) and chloroform (CF). Illumina sequencing analyses suggested that a particular microbial community was formed in the H2/O2 microcosm. The specific microbial species included Methyloversatilis, Dechloromonas, Sediminibacterium, Pseudomonas, Acinetobacter, Curvibacter, Comamonas and Acidovorax, and the relative abundance of the tceA, phe and soxB genes synchronously increased. These results suggested that some specific microbes are potential CHC converters using H2 and O2 as energy sources, and aerobic and anaerobic transformations exist simultaneously in the H2/O2 microcosm. It provides a theoretical basis for establishing efficient green remediation technologies for CHC contaminated aquifers.

Graphical abstract: Response of chlorinated hydrocarbon transformation and microbial community structure in an aquifer to joint H2 and O2

Supplementary files

Article information

Article type
Paper
Submitted
06 Jūl. 2022
Accepted
10 Aug. 2022
First published
16 Aug. 2022
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2022,12, 23252-23262

Response of chlorinated hydrocarbon transformation and microbial community structure in an aquifer to joint H2 and O2

C. Li, R. Chen, H. Liu, Y. Huang, J. Yu, W. Ouyang and C. Xue, RSC Adv., 2022, 12, 23252 DOI: 10.1039/D2RA04185E

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