Tetrachloroethene primes reductive dechlorination of polychlorinated biphenyls in a river sediment microcosm

Xu, Guofang; Lu, Qihong; Yu, Ling; Wang, Shanquan

doi:10.1016/j.watres.2018.12.061

Cited by 49 publications

(32 citation statements)

References 52 publications

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“…These results suggest that consequent treatment of organohalides with Bio-RD and PAO, rather than PAO pretreatment and then Bio-RD, may be feasible to combine the strengths of Bio-RD and PAO and to prevent shortages, as well as their side effects simultaneously. In Bio-RD-PAO, various biostimulation and bioaugmentation strategies can be employed to enhance OHRB-mediated halogen removal from the highly-halogenated organohalides (Tyagi et al, 2011;Roy et al, 2018;Xu et al, 2019). For example, bioaugmentation with anaerobic microorganisms has been employed to enhance the conversion of highly-chlorinated PCBs to lowly-chlorinated PCBs.…”

Section: $-mentioning

confidence: 99%

Integration of microbial reductive dehalogenation with persulfate activation and oxidation (Bio-RD-PAO) for complete attenuation of organohalides

Wang

2021

Front. Environ. Sci. Eng.

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Due to the toxicity of bioaccumulative organohalides to human beings and ecosystems, a variety of biotic and abiotic remediation methods have been developed to remove organohalides from contaminated environments. Bioremediation employing organohalide-respiring bacteria (OHRB)-mediated microbial reductive dehalogenation (Bio-RD) represents a cost-effective and environmentally friendly approach to attenuate highly-halogenated organohalides, specifically organohalides in soil, sediment and other anoxic environments. Nonetheless, many factors severely restrict the implications of OHRB-based bioremediation, including incomplete dehalogenation, low abundance of OHRB and consequent low dechlorination activity. Recently, the development of in situ chemical oxidation (ISCO) based on sulfate radicals (SO 4 ·− ) via the persulfate activation and oxidation (PAO) process has attracted tremendous research interest for the remediation of lowly-halogenated organohalides due to its following advantages, e.g., complete attenuation, high reactivity and no selectivity to organohalides. Therefore, integration of OHRB-mediated Bio-RD and subsequent PAO (Bio-RD-PAO) may provide a promising solution to the remediation of organohalides. In this review, we first provide an overview of current progress in Bio-RD and PAO and compare their limitations and advantages. We then critically discuss the integration of Bio-RD and PAO (Bio-RD-PAO) for complete attenuation of organohalides and its prospects for future remediation applications. Overall, Bio-RD-PAO opens up opportunities for complete attenuation and consequent effective in situ remediation of persistent organohalide pollution.

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Section: $-mentioning

confidence: 99%

Integration of microbial reductive dehalogenation with persulfate activation and oxidation (Bio-RD-PAO) for complete attenuation of organohalides

Wang

2021

Front. Environ. Sci. Eng.

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“…was employed for the subsequent processing and downstream analysis [29] as described [14,30]. Briefly, sequences with a similarity of 97% or greater were grouped into operational taxonomic units (OTUs) using uclust in QIIME, which were assigned taxonomy with the RDP classifier [31].…”

Section: Sequencing Data Processing Statistical and Network Analysesmentioning

confidence: 99%

Organic Carbon and Eukaryotic Predation Synergistically Change Resistance and Resilience of Aquatic Microbial Communities

Fang¹,

Liu²,

Mu³

et al. 2021

Preprint

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With dramatic global rise of urbanization, anthropogenic activities alter aquatic ecosystems in urban rivers through inputs of dissolved organic carbon (DOC) and nutrients. Microorganisms play crucial roles in global biogeochemical element cycles, providing functions to sustain microbial ecology stability. The DOC (bottom-up control) and microbial predation (top-down control) may synergistically drive the competition and evolution of aquatic microbial communities, and their resistance and resilience, of which experimental evidences remain scarce. In this study, laboratory sediment-water column experiments were employed to mimic the organic carbon-driven water blackening and odorization process in urban rivers and to elucidate impacts of DOC on the microbial ecology stability. Results showed that low DOC (25-75 mg/L TOC) and high DOC (100-150 mg/L TOC) changed the aquatic microbial community assemblies in different patterns: (1) the low DOC enriched K-selection microorganisms (e.g., bacteria and predators) with low biomass and low resilience, as well as high resistance to perturbations in changing microbial community assemblies; (2) the high DOC was associated with r-selection microorganisms with high biomass and improved resilience, together with low resistance detrimental to microbial ecology stability. Overall, this study provided new insights into impacts of DOC on aquatic microbial ecology stability, which may guide sustainable urban river management.

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“…They concluded that the dechlorination rate was linearly dependent on concentrations of PCBs that were freely dissolved in the microcosms. Xu, Lu, Lu, Yu, and Wang (2019) investigated the use of tetrachloroethene to stimulate PCB dechlorination in river sediment. They found that the tetrachloroethene enhanced PCB dechlorination in river sediment and pure culture, and the tetrachloroethene was completely transformed to ethene.…”

Section: Remediationmentioning

confidence: 99%

Contaminated aquatic sediments

Jaglal¹

2020

Water Environment Research

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Jawed and Krantzberg (2019) identified best practices to follow when remediating sediment sites based on experience gained at the Randle Reef Site in Ontario, Canada. The authors identify a list of challenges to overcome that fall under a broad series of headings that include issues associated with social, regulatory, political, and technical topics. Bianchini, Cento, Guzzini, Pellegrini, and Saccani (2019) reviewed more than 150 historical articles, written over the previous 50 years, to identify alternative

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Tetrachloroethene primes reductive dechlorination of polychlorinated biphenyls in a river sediment microcosm

Cited by 49 publications

References 52 publications

Integration of microbial reductive dehalogenation with persulfate activation and oxidation (Bio-RD-PAO) for complete attenuation of organohalides

Integration of microbial reductive dehalogenation with persulfate activation and oxidation (Bio-RD-PAO) for complete attenuation of organohalides

Organic Carbon and Eukaryotic Predation Synergistically Change Resistance and Resilience of Aquatic Microbial Communities

Contaminated aquatic sediments

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