Degradation of 1,1,2,2-tetrachloroethane and accumulation of vinyl chloride in wetland sediment microcosms and in situ porewater: biogeochemical controls and associations with microbial communities

Lorah, Michelle M.; Voytek, Mary A.

doi:10.1016/j.jconhyd.2003.08.010

Cited by 68 publications

(39 citation statements)

References 39 publications

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“…This raises concern because of the potential effects of these compounds on the nervous system, the liver, the kidneys, and the lungs (2,3). Fortunately, it has been observed that both compounds are susceptible to biodegradation, under aerobic (5,23,28,32,47), cometabolic (6,11,12,17,20,24,30,48), and anaerobic (9,10,18,33,36,38,44,52) conditions. Therefore, bioremediation is potentially a viable option for removing these compounds from contaminated sites.…”

mentioning

confidence: 99%

Growth of Dehalobacter and Dehalococcoides spp. during Degradation of Chlorinated Ethanes

Grostern¹,

Edwards

2006

Appl Environ Microbiol

129

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Mixed anaerobic microbial subcultures enriched from a multilayered aquifer at a former chlorinated solvent disposal facility in West Louisiana were examined to determine the organism(s) involved in the dechlorination of the toxic compounds 1,2-dichloroethane (1,2-DCA) and 1,1,2-trichloroethane (1,1,2-TCA) to ethene. Sequences phylogenetically related to Dehalobacter and Dehalococcoides, two genera of anaerobic bacteria that are known to respire with chlorinated ethenes, were detected through cloning of bacterial 16S rRNA genes. Denaturing gradient gel electrophoresis analysis of 16S rRNA gene fragments after starvation and subsequent reamendment of culture with 1,2-DCA showed that the Dehalobacter sp. grew during the dichloroelimination of 1,2-DCA to ethene, implicating this organism in degradation of 1,2-DCA in these cultures. Species-specific real-time quantitative PCR was further used to monitor proliferation of Dehalobacter and Dehalococcoides during the degradation of chlorinated ethanes and showed that in fact both microorganisms grew simultaneously during the degradation of 1,2-DCA. Conversely, Dehalobacter grew during the dichloroelimination of 1,1,2-TCA to vinyl chloride (VC) but not during the subsequent reductive dechlorination of VC to ethene, whereas Dehalococcoides grew only during the reductive dechlorination of VC but not during the dichloroelimination of 1,1,2-TCA. This demonstrated that in mixed cultures containing multiple dechlorinating microorganisms, these organisms can have either competitive or complementary dechlorination activities, depending on the chloro-organic substrate.

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confidence: 99%

Growth of Dehalobacter and Dehalococcoides spp. during Degradation of Chlorinated Ethanes

Grostern¹,

Edwards

2006

Appl Environ Microbiol

129

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“…The literature review was not intended to be exhaustive, but provides examples of laboratory information that is available to describe the reaction pathways. For convenience, a select set of references that discuss abiotic and biotic reaction pathways for chlorinated solvents are noted in this document Washington, 1995;Lorah and Olsen, 1999;Truex et al, 2001;De Wildeman and Verstraete, 2003;Lorah and Voytek, 2004;Hunkeler et al, 2005]. To make this reaction module more flexible and general, several pathways that were not directly supported by laboratory data in the open literature are included ( Table 6).…”

Section: Conceptual Model For Dechlorination Reactionsmentioning

confidence: 99%

Developing an Mna Modeling Tool Based on Rt3d: 3 Reports

KM¹,

Looney²,

Johnson³

et al. 2006

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“…Their rates of biodegradation have also been estimated in a number of studies (AlvarezCohen & McCarty, 1991;Anderson & McCarty, 1996;Ballapragada et al, 1997;Bielefeldt et al, 1994;Devlin et al, 2002;Dolan & McCarty, 1995;Fathepure & Tiedje, 1994;Gao et al, 1995;Lorah & Voytek, 2004;Oldenhuis et al, 1991;Singh et al, 2004;Suna et al, 2001). Suarez and Rifai (1999) compiled a database of biodegradation rates from the literature.They reported average rates for reductive dechlorination from field/in situ studies on the order of 3.65 yr , and 1.096 yr -1 for PCE,TCE, cis-DCE, and VC, respectively.…”

Section: Introductionmentioning

confidence: 97%

Modeling remediation time using natural attenuation at a dry-cleaner site

Hausman¹,

Rifai

2005

Remediation

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Contaminants from dry-cleaning sites, primarily tetrachloroethene (PCE), trichloroethene (TCE), cisdichloroethene (cis-DCE), and vinyl chloride (VC), have become a major concern because of the limited funds and regulatory programs to address them. Thus, natural attenuation and its effectiveness for these sites needs to be evaluated as it might provide a less costly alternative to other remediation methods. In this research, data from a site in Texas were analyzed and modeled using the Biochlor analytical model to evaluate remediation times using natural attenuation. It was determined that while biodegradation and source decay were occurring at the site, the resulting attenuation rates were not adequate to achieve cleanup in a reasonable time frame without additional source remediation or control strategies. Cleanup times exceeded 100 years for all constituents at the site boundary and 800 years at the source for PCE, assuming cleanup levels of 0.005 mg/L for PCE and TCE and 0.07 mg/L and 0.002 mg/L for cis-DCE and VC, respectively.

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Degradation of 1,1,2,2-tetrachloroethane and accumulation of vinyl chloride in wetland sediment microcosms and in situ porewater: biogeochemical controls and associations with microbial communities

Cited by 68 publications

References 39 publications

Growth of Dehalobacter and Dehalococcoides spp. during Degradation of Chlorinated Ethanes

Growth of Dehalobacter and Dehalococcoides spp. during Degradation of Chlorinated Ethanes

Developing an Mna Modeling Tool Based on Rt3d: 3 Reports

Modeling remediation time using natural attenuation at a dry-cleaner site

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