Direct aerobic oxidation (DAO) of chlorinated aliphatic hydrocarbons: A review of key DAO bacteria, biometabolic pathways and in-situ bioremediation potential

Xing, Zhilin; Su, Xia; Zhang, Xiaoping; Zhang, Lijie; Zhao, Tiantao

doi:10.1016/j.envint.2022.107165

Cited by 19 publications

(5 citation statements)

References 96 publications

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“…In the VC oxidation pathway (Figure 4), the first enzyme of the pathway is an alkene monooxygenase (AkMO) that, with the addition of one oxygen atom, converts its substrates (VC and ethene) into aliphatic epoxides (i.e., epoxyethane and chlorooxirane). AkMO is composed of four subunits that are encoded by the genes etnA, etnB, etnC, and etnD [63,64]. The second enzyme is epoxyalkane:coenzyme M transferase (EaCoMT), encoded by the etnE gene.…”

Section: Dce and Vc Metabolic Degradationmentioning

confidence: 99%

Sequential Anaerobic/Aerobic Microbial Transformation of Chlorinated Ethenes: Use of Sustainable Approaches for Aquifer Decontamination

Bertolini

Zecchin

Cavalca

2023

Water

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Chlorinated ethene contamination is a worldwide relevant health issue. In anaerobic aquifers, highly chlorinated ethenes are transformed by microbially-mediated organohalide respiration metabolism. For this reason, in the last few years, bioremediation interventions have been developed and employed in situ for aquifer decontamination. Biostimulation has been demonstrated to be efficient in enhancing organohalide respiration activity. The use of agrifood wastes that replace engineered substrates as biostimulants permits the low carbon impact of bioremediation treatment as part of a circular economy approach. The present work depicts the effects of available bio-based substrates and discusses their efficiency and impact on microbial communities when applied to contaminated aquifers. As a drawback of anaerobic organohalide respiration, there is the accumulation of more toxic lower-chlorinated ethenes. However, compounds such as dichloroethene (DCE) and vinyl chloride (VC) can be mineralized by metabolic and co-metabolic pathways in aerobic conditions. For this reason, sequential anaerobic/aerobic treatments proposed to stimulate the natural biotransformation activity can achieve complete degradation of chlorinated ethenes. The aim of this work is to provide an up-to-date revision of anaerobic/aerobic microbial transformation pathways towards chlorinated ethenes and to discuss their application in real scenarios and futurable microbial bioelectrochemical systems to remediate contaminated aquifers.

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Section: Dce and Vc Metabolic Degradationmentioning

confidence: 99%

Sequential Anaerobic/Aerobic Microbial Transformation of Chlorinated Ethenes: Use of Sustainable Approaches for Aquifer Decontamination

Bertolini

Zecchin

Cavalca

2023

Water

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“…Aerobic direct oxidation of TCE is a promising biological technology because it does not require auxiliary substrates and all available oxygen can be directly used for biodegradation ( Gaza et al, 2019 ; Xing et al, 2022 ). In direct oxidation, microorganisms acquire organic carbon and energy by oxidatively degrading TCE ( Pant and Pant, 2010 ).…”

Section: Biodegradation Of Tcementioning

confidence: 99%

“…TCE is used widely in various commercial and industrial applications ( Shukla et al, 2014 ) and in many household products ( Suttinun et al, 2013 ). Due to the inappropriate handling, storage, disposal, and accidental release, TCE has been detected ubiquitously in soil and groundwater in many countries worldwide ( Xing et al, 2022 ; Yamazaki et al, 2022 ), including the United States ( Steffan et al, 1999 ; Lee et al, 2012 ; de Guzman et al, 2018 ), Canada ( Perez-de-Mora et al, 2014 ), France ( Dugat-Bony et al, 2012 ; Walaszek et al, 2021 ), and China ( Kuo et al, 2004 ; Kao et al, 2016 ). TCE contamination is known to account for 22% of soil and groundwater at superfund sites in the USA ( USEPA, 2013 ), and was found in 57% of National Priorities List sites in 2015 ( ATSDR, 2011 ; de Guzman et al, 2018 ).…”

Section: Introductionmentioning

confidence: 99%

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Recent advances and trends of trichloroethylene biodegradation: A critical review

Man

Niu

et al. 2022

Front. Microbiol.

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Trichloroethylene (TCE) is a ubiquitous chlorinated aliphatic hydrocarbon (CAH) in the environment, which is a Group 1 carcinogen with negative impacts on human health and ecosystems. Based on a series of recent advances, the environmental behavior and biodegradation process on TCE biodegradation need to be reviewed systematically. Four main biodegradation processes leading to TCE biodegradation by isolated bacteria and mixed cultures are anaerobic reductive dechlorination, anaerobic cometabolic reductive dichlorination, aerobic co-metabolism, and aerobic direct oxidation. More attention has been paid to the aerobic co-metabolism of TCE. Laboratory and field studies have demonstrated that bacterial isolates or mixed cultures containing Dehalococcoides or Dehalogenimonas can catalyze reductive dechlorination of TCE to ethene. The mechanisms, pathways, and enzymes of TCE biodegradation were reviewed, and the factors affecting the biodegradation process were discussed. Besides, the research progress on material-mediated enhanced biodegradation technologies of TCE through the combination of zero-valent iron (ZVI) or biochar with microorganisms was introduced. Furthermore, we reviewed the current research on TCE biodegradation in field applications, and finally provided the development prospects of TCE biodegradation based on the existing challenges. We hope that this review will provide guidance and specific recommendations for future studies on CAHs biodegradation in laboratory and field applications.

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“…On the other hand, aerobic biodegradation of chloroethene compounds can occur metabolically (Bradley, 2003; Gaza et al, 2019; Mattes et al, 2010; Tiehm & Schmidt, 2011), or cometabolically (Gaza et al, 2019; Mattes et al, 2010; Tiehm & Schmidt, 2011; Zalesak et al, 2017), by using oxygen as the electron acceptor resulting as final products chloride ions (Cl − ) and carbon dioxide (CO 2 ) (Davis et al, 2002; Dolinová et al, 2017; Gaza et al, 2019; Zalesak et al, 2017). Oxygenases (monooxygenases and dioxygenases) from several bacteria have been involved in the aerobic cometabolism and/or direct oxidation of PCE and its daughter products Sutherland (Ensign et al, 1992; Fetzner & Lingens, 1994; Nishino et al, 2013; Pflugmacher et al, 1996; Suthersan, 1999; Xing et al, 2022). For instance, enzymes such as methane monooxygenases (MMO), catechol‐1,2‐ and catechol‐2,3‐dioxygenases and phenol hydroxylase promote the mineralization of TCE and c DCE by cometabolism (Cupples & Thelusmond, 2022; Gafni et al, 2020; Wu et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Biodegradation of chloroethene compounds under microoxic conditions

Ojo,

Castillo,

Cason

et al. 2023

Biotech & Bioengineering

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The biodegradation of chloroethene compounds under oxic and anoxic conditions is well established. However, the biological reactions that take place under microoxic conditions are unknown. Here, we report the biostimulated (BIOST: addition of lactate) and natural attenuated (NAT) degradation of chloroethene compounds under microoxic conditions by bacterial communities from chloroethene compounds‐contaminated groundwater. The degradation of tetrachloroethene was significantly higher in NAT (15.14% on average) than in BIOST (10.13% on average) conditions at the end of the experiment (90 days). Sporomusa, Paracoccus, Sedimentibacter, Pseudomonas, and Desulfosporosinus were overrepresented in NAT and BIOST compared to the source groundwater. The NAT metagenome contains phenol hydrolase P1 oxygenase (dmpL), catechol‐1,2‐dioxygenase (catA), catechol‐2,3‐dioxygenases (dmpB, todE, and xylE) genes, which could be involved in the cometabolic degradation of chloroethene compounds; and chlorate reductase (clrA), that could be associated with partial reductive dechlorination of chloroethene compounds. Our data provide a better understanding of the bacterial communities, genes, and pathways potentially implicated in the reductive and cometabolic degradation of chloroethene compounds under microoxic conditions.

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Direct aerobic oxidation (DAO) of chlorinated aliphatic hydrocarbons: A review of key DAO bacteria, biometabolic pathways and in-situ bioremediation potential

Cited by 19 publications

References 96 publications

Sequential Anaerobic/Aerobic Microbial Transformation of Chlorinated Ethenes: Use of Sustainable Approaches for Aquifer Decontamination

Sequential Anaerobic/Aerobic Microbial Transformation of Chlorinated Ethenes: Use of Sustainable Approaches for Aquifer Decontamination

Recent advances and trends of trichloroethylene biodegradation: A critical review

Biodegradation of chloroethene compounds under microoxic conditions

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