Extent of natural attenuation of chlorinated ethenes at a contaminated site in Denmark

Schiefler, Adrian A.; Tobler, Dominique J.; Overheu, Niels D.; Tuxen, Nina

doi:10.1016/j.egypro.2018.07.024

Cited by 12 publications

(4 citation statements)

References 20 publications

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“…Chemical properties of the contaminants have been derived by USEPA 1996 [65], except for the first order degradation constant λ, taken from the handbook of Howard [66]. The C w0 has been chosen according to the literature focusing on contaminated sites [43,[67][68][69][70]. The physico-chemical properties of the selected contaminants are reported in Table 5.…”

Section: Parameter * Valuementioning

confidence: 99%

A Comparative Assessment of Analytical Fate and Transport Models of Organic Contaminants in Unsaturated Soils

et al. 2020

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Analytical models for the simulation of contaminants’ fate and transport in the unsaturated zone are used in many engineering applications concerning groundwater resource management and risk assessment. As a consequence, several scientific studies dealing with the development and application of analytical solutions have been carried out. Six models have been selected and compared based on common characteristics to identify pros and cons as well as to highlight any difference in the final output. The analyzed models have been clustered into three groups according to the assumptions on contaminant source and physico-chemical mechanisms occurring during the transport. Comparative simulations were carried out with five target contaminants (Benzene, Benzo(a)pyrene, Vinyl Chloride, Trichloroethylene and Aldrin) with different decay’s coefficient, three types of soil (sand, loam and clay) and three different thicknesses of the contaminant source. The calculated concentration at a given depth in the soil for the same contamination scenario varied greatly among the models. A significant variability of the concentrations was shown due to the variation of contaminant and soil characteristics. As a general finding, the more advanced is the model, the lower the predicted concentrations; thus, models that are too simplified could lead to outcomes of some orders of magnitude greater than the advanced one.

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Section: Parameter * Valuementioning

confidence: 99%

A Comparative Assessment of Analytical Fate and Transport Models of Organic Contaminants in Unsaturated Soils

et al. 2020

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“…Additionally, [20] presented the unique Italian case study available in the literature, showing evidence of degradation by natural attenuation for a BTEXS plume in the NIT site and highlighting the need for evaluation protocols before the application of this methodology in formal plans. Some studies include a comprehensive analyses of several plumes managed through MNA [21,22], other studies on Carbon Tetrachloride and Chloroform plume [23], CHCs [24][25][26][27], and hydrocarbons [28][29][30] and abiotic MNA [31].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of MNA in A Chlorinated Solvents-Contaminated Aquifer Using Reactive Transport Modeling Coupled with Isotopic Fractionation Analysis

Antelmi

Mazzon

Höhener

et al. 2021

Water

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Groundwater contamination by chlorinated hydrocarbons is a worldwide problem that poses important challenges in remediation processes. In Italy, the Legislative Decree 152/06 defines the water quality limits to be obtained during the cleanup process. In situ bioremediation techniques are becoming increasingly important due to their affordability and, under the right conditions, because they can be more effective than conventional methodologies. In the initial feasibility study phase, the numerical modeling supports the reliability of each technique. Two different codes, BIOCHLOR and PHREEQC were discussed and compared assuming different field conditions. Isotopic Fractionation-Reactive Transport Models were then developed in one synthetic and one simple field case. From the results, the two codes were in agreement and also able to demonstrate the Monitored Natural Attenuation processes occurring at the dismissed site located in Italy. Finally, the PHREEQC model was used to forecast the remediation time frame by MNA, hypothesizing a complete source cleanup: a remediation time frame of about 10–11 years was achieved by means of natural attenuation processes.

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“…The passive and in situ anaerobic dechlorination system (e.g., in situ biostimulation system to enhance reductive dechlorination of TCE) has been widely applied for the cleanup of TCE-polluted groundwater sites due to its effectiveness and low cost for a long-term site remediation (Luo et al, 2019;Qiu et al, 2021;Sheu et al, 2016). For the reductive dechlorination, hydrogen (H 2 ) and TCE are used as the electron donor and acceptor, respectively (Hao et al, 2021;Schiefler et al, 2018). Supplement of a passive and slow-release primary substrate could create anaerobic conditions for hydrogen production.…”

Section: Introductionmentioning

confidence: 99%

Bioremediation of trichloroethylene‐polluted groundwater using emulsified castor oil for slow carbon release and acidification control

Chen

Surmpalli

et al. 2021

Water Environment Research

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In this study, the emulsified castor oil (ECO) substrate was developed for a long‐term supplement of biodegradable carbon with pH buffering capacity to anaerobically bioremediate trichloroethylene (TCE)‐polluted groundwater. The ECO was produced by mixing castor oil, surfactants (sapindales and soya lecithin [SL]), vitamin complex, and a citrate/sodium phosphate dibasic buffer system together for slow carbon release. Results of the emulsification experiments and microcosm tests indicate that ECO emulsion had uniform small droplets (diameter = 539 nm) with stable oil‐in‐water characteristics. ECO had a long‐lasting, dispersive, negative zeta potential (−13 mv), and biodegradable properties (viscosity = 357 cp). Approximately 97% of TCE could be removed with ECO supplement after a 95‐day operational period without the accumulation of TCE dechlorination byproducts (dichloroethylene and vinyl chloride). The buffer system could neutralize acidified groundwater, and citrate could be served as a primary substrate. ECO addition caused an abrupt TCE adsorption at the initial stage and the subsequent removal of adsorbed TCE. Results from the next generation sequences and real‐time polymerase chain reaction (PCR) indicate that the increased microbial communities and TCE‐degrading bacterial consortia were observed after ECO addition. ECO could be used as a pH‐control and carbon substrate to enhance anaerobic TCE biodegradation effectively. Practitioner Points Emulsified castor oil (ECO) contains castor oil, surfactants, and buffer for a slow carbon release and pH control. ECO can be a long‐term carbon source for trichloroethylene (TCE) dechlorination without causing acidification. TCE removal after ECO addition is due to adsorption and reductive dechlorination mechanisms.

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Extent of natural attenuation of chlorinated ethenes at a contaminated site in Denmark

Cited by 12 publications

References 20 publications

A Comparative Assessment of Analytical Fate and Transport Models of Organic Contaminants in Unsaturated Soils

A Comparative Assessment of Analytical Fate and Transport Models of Organic Contaminants in Unsaturated Soils

Evaluation of MNA in A Chlorinated Solvents-Contaminated Aquifer Using Reactive Transport Modeling Coupled with Isotopic Fractionation Analysis

Bioremediation of trichloroethylene‐polluted groundwater using emulsified castor oil for slow carbon release and acidification control

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