Molecular approach to evaluate biostimulation of 1,2-dibromoethane in contaminated groundwater

Baek, Kwang Hyun; McKeever, Robert; Rieber, Kahlil; Sheppard, Diane; Park, Chul; Ergas, Sarina J.; Nüsslein, Klaus

doi:10.1016/j.biortech.2012.05.119

Cited by 13 publications

(6 citation statements)

References 23 publications

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“…Enhancements to the aerobic biodegradation rates for EDB in groundwater have been documented following addition of co-metabolic substrates such as methane (McKeever et al 2012), jet fuel (Baek et al 2012) and pentane (Danko et al 2012). It is possible that higher concentrations of hydrocarbons in the vadose zone facilitated co-metabolic biodegradation of EDB that resulted in the higher first-order aerobic biodegradation rate constants observed for LNAPL source.…”

Section: First-order Aqueous Phase Aerobic Biodegradation Rate Constants For Edbmentioning

confidence: 99%

Evaluation of Vapor Intrusion Risk from Ethylene Dibromide Using the Vertical Screening Distance Approach

Kolhatkar¹,

Luo²,

Berns³

et al. 2021

Groundwater Monitoring Rem

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This column reviews the general features of PHT3D Version 2, a reactive multicomponent transport model that couples the geochemical modeling software PHREEQC-2 (Parkhurst and Appelo 1999) with three-dimensional groundwater flow and transport simulators MODFLOW-2000 and MT3DMS (Zheng and Wang 1999). The original version of PHT3D was developed by Henning Prommer and Version 2 by Henning Prommer and Vincent Post (Prommer and Post 2010). More detailed information about PHT3D is available at the website http://www.pht3d.org.The review was conducted separately by two reviewers. This column is presented in two parts.

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Section: First-order Aqueous Phase Aerobic Biodegradation Rate Constants For Edbmentioning

confidence: 99%

Evaluation of Vapor Intrusion Risk from Ethylene Dibromide Using the Vertical Screening Distance Approach

Kolhatkar¹,

Luo²,

Berns³

et al. 2021

Groundwater Monitoring Rem

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“…However, many of these compounds are considered to be toxic, carcinogenic or even mutagenic . One of these brominated contaminants is ethylene dibromide (EDB, 1,2-dibromoethane), extensively used in the past as a lead scavenger in gasoline as well as an agriculture fumigant. − EDB is susceptible to abiotic reactions and can be biodegraded under oxic and anoxic conditions. − In general, all EDB transformations in the environment can follow several different mechanistic pathways: nucleophilic substitution (e.g., hydrolysis), dehydrobromination, dibromoelimination, or radical oxidation (via proton abstraction). Under certain conditions, EDB degradation may occur through multiple reaction types.…”

Section: Introductionmentioning

confidence: 99%

Dual Carbon–Bromine Stable Isotope Analysis Allows Distinguishing Transformation Pathways of Ethylene Dibromide

Kuntze

Kozell

Richnow

et al. 2016

Environ. Sci. Technol.

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The present study investigated dual carbon-bromine isotope fractionation of the common groundwater contaminant ethylene dibromide (EDB) during chemical and biological transformations, including aerobic and anaerobic biodegradation, alkaline hydrolysis, Fenton-like degradation, debromination by Zn(0) and reduced corrinoids. Significantly different correlation of carbon and bromine isotope fractionation (ΛC/Br) was observed not only for the processes following different transformation pathways, but also for abiotic and biotic processes with, the presumed, same formal chemical degradation mechanism. The studied processes resulted in a wide range of ΛC/Br values: ΛC/Br = 30.1 was observed for hydrolysis of EDB in alkaline solution; ΛC/Br between 4.2 and 5.3 were determined for dibromoelimination pathway with reduced corrinoids and Zn(0) particles; EDB biodegradation by Ancylobacter aquaticus and Sulfurospirillum multivorans resulted in ΛC/Br = 10.7 and 2.4, respectively; Fenton-like degradation resulted in carbon isotope fractionation only, leading to ΛC/Br ∞. Calculated carbon apparent kinetic isotope effects ((13)C-AKIE) fell with 1.005 to 1.035 within expected ranges according to the theoretical KIE, however, biotic transformations resulted in weaker carbon isotope effects than respective abiotic transformations. Relatively large bromine isotope effects with (81)Br-AKIE of 1.0012-1.002 and 1.0021-1.004 were observed for nucleophilic substitution and dibromoelimination, respectively, and reveal so far underestimated strong bromine isotope effects.

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“…We speculate that the potential mechanisms of co-substrates contribution under dynamic DO conditions are as follows. Under aerobic conditions, EDB may be catalyzed by oxygenase enzyme induced by different substrates, such as ethane and jet fuel, as used by Hatzinger et al [7] and Baek et al [57], respectively. Similarly, monooxygenases were induced by methane or ethanol to degrade chlorinated ethenes [58].…”

Section: Resultsmentioning

confidence: 99%

Aerobic and Anaerobic Biodegradation of 1,2-Dibromoethane by a Microbial Consortium under Simulated Groundwater Conditions

Wang

Yang

Song

et al. 2019

IJERPH

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This study was conducted to explore the potential for 1,2-Dibromoethane (EDB) biodegradation by an acclimated microbial consortium under simulated dynamic groundwater conditions. The enriched EDB-degrading consortium consisted of anaerobic bacteria Desulfovibrio, facultative anaerobe Chromobacterium, and other potential EDB degraders. The results showed that the biodegradation efficiency of EDB was more than 61% at 15 °C, and the EDB biodegradation can be best described by the apparent pseudo-first-order kinetics. EDB biodegradation occurred at a relatively broad range of initial dissolved oxygen (DO) from 1.2 to 5.1 mg/L, indicating that the microbial consortium had a strong ability to adapt. The addition of 40 mg/L of rhamnolipid and 0.3 mM of sodium lactate increased the biodegradation. A two-phase biodegradation scheme was proposed for the EDB biodegradation in this study: an aerobic biodegradation to carbon dioxide and an anaerobic biodegradation via a two-electron transfer pathway of dihaloelimination. To our knowledge, this is the first study that reported EDB biodegradation by an acclimated consortium under both aerobic and anaerobic conditions, a dynamic DO condition often encountered during enhanced biodegradation of EDB in the field.

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Molecular approach to evaluate biostimulation of 1,2-dibromoethane in contaminated groundwater

Cited by 13 publications

References 23 publications

Evaluation of Vapor Intrusion Risk from Ethylene Dibromide Using the Vertical Screening Distance Approach

Evaluation of Vapor Intrusion Risk from Ethylene Dibromide Using the Vertical Screening Distance Approach

Dual Carbon–Bromine Stable Isotope Analysis Allows Distinguishing Transformation Pathways of Ethylene Dibromide

Aerobic and Anaerobic Biodegradation of 1,2-Dibromoethane by a Microbial Consortium under Simulated Groundwater Conditions

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