Long-term monitoring and evaluating biological activity of in situ anaerobic reductive dechlorination at a highly recharged and TCE-contaminated aquifer

Han, Kyungjin; Hong, Uijeon; Park, Sunhwa; Lee, Gyusang; Kwon, Soo-youl; Kim, Young

doi:10.1080/19443994.2016.1153903

Cited by 6 publications

(3 citation statements)

References 47 publications

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“…While much focus has been on understanding and quantifying the biological mechanisms responsible for the long-term transformation of PCE and TCE in aquifers (e.g., refs − ), studies focusing on quantifying the abiotic dechlorination processes associated with low permeability (e.g., clays, silts) natural aquifer materials are comparatively few. Several studies have shown that abiotic dechlorination under anaerobic conditions and in the presence of single ferrous minerals, such as pyrite, magnetite, iron sulfide, and green rust, can result in a generation of reduced gases. − Similarly, studies performed under anaerobic conditions using natural aquifer materials have shown dechlorination of PCE or TCE to reduced gases such as acetylene, ethene, ethane, propane, and/or butane; no carboxylic acid generation was observed. − In clayey sediments, dechlorination half-lives as low as 17 years were measured, even after several decades of exposure to chlorinated solvents in the field .…”

Section: Introductionmentioning

confidence: 99%

Mechanisms for Abiotic Dechlorination of Trichloroethene by Ferrous Minerals under Oxic and Anoxic Conditions in Natural Sediments

Schaefer

Berns

et al. 2018

Environ. Sci. Technol.

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Bench-scale experiments were performed on natural sediments to assess abiotic dechlorination of trichloroethene (TCE) under both aerobic and anaerobic conditions. In the absence of oxygen (<26 μM), TCE dechlorination proceeded via a reductive pathway generating acetylene and/or ethene. Reductive dechlorination rate constants up to 3.1 × 10–5 d–1 were measured, after scaling to in situ solid:water ratios. In the presence of oxygen greater than 120 μM, TCE dechlorination proceeded via an oxidative pathway generating formic/glyoxylic and glycolic/acetic acids, and oxidative dechlorination rate constants (again scaled to in situ conditions) up to 7.4 × 10–3 d–1 were measured. These rates correspond to half-lives of 60 and 0.25 years for abiotic TCE dechlorination under anaerobic and aerobic conditions, respectively, indicating the potentially large impact of aerobic TCE oxidation in the field. For both reductive and oxidative TCE dechlorination pathways, measured first-order rate constants increased with increasing ferrous iron content, suggesting the role of iron oxidation. Hydroxyl radical formation was measured and increased with increasing oxygen and ferrous iron content. Rate constants associated with TCE oxidation products increased with increasing hydroxyl radical generation rates, and were zero in the presence of a hydroxyl radical scavenger, suggesting that oxidative TCE dechlorination is a hydroxyl radical driven process.

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Section: Introductionmentioning

confidence: 99%

Mechanisms for Abiotic Dechlorination of Trichloroethene by Ferrous Minerals under Oxic and Anoxic Conditions in Natural Sediments

Schaefer

Berns

et al. 2018

Environ. Sci. Technol.

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“…The most typical in research studies is lactate, which is a by-product of the fermentation process and can also serve as an effective electron donor and organic carbon source [7,14,[44][45][46]. However, many other sources were successfully tested, e.g., emulsified vegetable oils [47,48], glucose [47,49], acetate [50], formate, and fumarate [51]. Additionally improved, multi-purpose (containing also sources of surfactants and vitamins and/or pH control agents) and slow-releasing sources were tested [52,53].…”

Section: Chemical Analysesmentioning

confidence: 99%

Thermally Enhanced Biodegradation of TCE in Groundwater

Najmanová

Steinová

Czinnerová

et al. 2022

Water

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In situ remediation is usually restricted by temperature, lack of substrate for reductive dechlorination (anaerobic respiration), the presence of dehalogenating microorganisms, and specific bedrock conditions. In this work, trichloroethene (TCE) degradation was studied by a number of methods, from physical–chemical analyses to molecular biological tools. The abundance changes in dechlorinating bacteria were monitored using real-time PCR. The functional genes vcrA and bvcA as well as the 16S rRNA specific for representatives of genera Dehalococcoides, Dehalobacter, and Desulfitobacterium were monitored. Furthermore, the sulfate-reducing bacteria and denitrifying bacteria were observed by amplifying the functional genes apsA and nirK. The elevated temperature and the substrate (whey) addition significantly affected TCE dechlorination. The chlorine index decreased after nine weeks from 2.5 to 0.1 at 22 °C, to 1.1 at 17 °C and 1.7 at 12 °C and complete dechlorination was achieved at 22 °C with whey addition. The achieved results of this work show the feasibility and effectiveness of biological dechlorination of TCE enhanced with elevated temperature and whey addition.

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“…After injecting a liquid oxidizing agent into groundwater contaminated with CAHs, such as trichloroethylene (TCE), the contaminants have been reported to rebound after approximately 50 h, thus necessitating continuous injection [7]. Han et al [8] applied a liquid-based management process to an aquifer contaminated with high nitrate concentrations, and a liquid was continuously injected in areas with rapid groundwater flow.…”

Section: Introductionmentioning

confidence: 99%

Development of Slow-Releasing Tablets Combined with Persulfate and Ferrous Iron for In Situ Chemical Oxidation in Trichloroethylene-Contaminated Aquifers

Yun,

Park,

Kim

et al. 2023

Water

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Slow-releasing tablets combined with persulfate acting as an oxidant and ferrous iron acting as an activator were manufactured for in situ chemical oxidation. The trichloroethylene (TCE) removal efficiency according to the molar ratio of the oxidizer and activator in the 0, 0.5, 1, 1.5, 2, and 2.5 molar ratio (persulfate: ferrous iron) reactors were 15%, 89%, 90%, 82%, 71%, and 55%, respectively. In a batch reactor injected with an oxidation-activation combined tablet (OACT) and a liquid oxidizing/activator, the TCE removal efficiencies were 100% and 70%, respectively, showing that the tablet form had a high efficiency in contaminant removal. The evaluation of the dissolution characteristics and TCE removal efficiency of OACT 0.5 (tablet with a 1:0.5 molar ratio of persulfate to activator) and OACT 1.0 (tablet with a 1:1 molar ratio of persulfate to activator) under continuous flow conditions showed that the TCE removal efficiency of the OACT 1.0 column was approximately 1.4 times higher than that of OACT 0.5. The longevities of persulfate and ferrous iron of the OACT 1.0 tablet were 43.2 days and 41.7 days, respectively. Thus, OACT 1.0, which was manufactured effectively, was suitable for in situ slow-release chemical oxidation systems.

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Long-term monitoring and evaluating biological activity of in situ anaerobic reductive dechlorination at a highly recharged and TCE-contaminated aquifer

Cited by 6 publications

References 47 publications

Mechanisms for Abiotic Dechlorination of Trichloroethene by Ferrous Minerals under Oxic and Anoxic Conditions in Natural Sediments

Mechanisms for Abiotic Dechlorination of Trichloroethene by Ferrous Minerals under Oxic and Anoxic Conditions in Natural Sediments

Thermally Enhanced Biodegradation of TCE in Groundwater

Development of Slow-Releasing Tablets Combined with Persulfate and Ferrous Iron for In Situ Chemical Oxidation in Trichloroethylene-Contaminated Aquifers

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