Degradation kinetics of chlorinated aliphatic hydrocarbons by methane oxidizers naturally-associated with wetland plant roots

Powell, Christina L.; Goltz, Mark N.; Agrawal, Abinash

doi:10.1016/j.jconhyd.2014.10.001

Cited by 12 publications

(4 citation statements)

References 43 publications

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“…However, given the high contaminant concentrations, the process of natural attenuation was not enough to abate the concentrations of PCE and TCE to under a satisfactory level, as demonstrated by the high concentrations of both compounds at Pz13. Even though the k RD2 values were lower than the maximum values observed for natural attenuation at some sites (in particular for PCE, for which a maximum rate of 29.00 y −1 was observed), they were still much higher than the mean literature values [51].…”

Section: Approachcontrasting

confidence: 59%

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Assessing a Large-Scale Sequential In Situ Chloroethene Bioremediation System Using Compound-Specific Isotope Analysis (CSIA) and Geochemical Modeling

et al. 2022

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Compound-specific isotopic analysis (CSIA) and geochemical modeling were applied to evaluate the effectiveness of an 800 m-long sequential in situ bioremediation (ISB) system in Northern Italy. The system was created for the clean-up of a polluted aquifer affected by chloroethenes. A hydraulically upgradient anaerobic (AN)-biobarrier-stimulated reductive dichlorination (RD) of higher chloroethenes (PCE, TCE) and a downgradient aerobic (AE)-biobarrier-stimulated oxidation (OX) of lower chloroethenes (DCE, VC) were proposed. Carbon CSIA and concentration data were collected for PCE, TCE, cis-DCE and VC and interpreted using a reactive transport model that was able to simulate isotopic fractionation. The analysis suggested that the combination of CSIA and modeling was critical to evaluate the efficiency of sequential ISBs for the remediation of chloroethenes. It was found that the sequential ISB could reduce the PCE, TCE and cis-DCE concentrations by >99% and VC concentrations by >84% along the flow path. First-order RD degradation rate constants (kRD) increased by 30 times (from kRD = 0.2–0.3 y−1 up to kRD = 6.5 y−1) downgradient of the AN barrier. For cis-DCE and VC, the AE barrier had a fundamental role to enhance OX. First-order OX degradation rate constants (kOX) ranged between kOX = 0.7–155 y−1 for cis-DCE and kOX = 1.7–12.6 y−1 for VC.

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Section: Approachcontrasting

confidence: 59%

“…Degradation rate constants for PCE and TCE upgradient of the AN barrier (k RD1 ) were of the same order of magnitude as those reported in Table 1, which were obtained from the compilation by [51]. Note that these authors analyzed biodegradation in sites exclusively undergoing natural attenuation.…”

Section: Approachmentioning

confidence: 65%

Assessing a Large-Scale Sequential In Situ Chloroethene Bioremediation System Using Compound-Specific Isotope Analysis (CSIA) and Geochemical Modeling

et al. 2022

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“…Later, the removal of toluene from the rhizosphere pore water of the planted and unplanted mesocosms was simulated using a set of mass balance equations in order to include aqueous diffusion of toluene towards the root surface and its eventual translocation from root to shoot biomass. Observation showed that toluene was degraded in all three mesocosms, but the rate constant of toluene removal was higher for planted mesocosms with shoots (MI) in contrast with mesocosms M2 and M3, which can be assigned to the function of plants in wetlands [ 39 ]. Even plant-assisted bioremediation reduced the time required for biodegradation by up to 25%.…”

Section: Pot-scale Wetland Treatment Of Btexmentioning

confidence: 99%

Bioremediation of Organic Pollutants in Soil–Water System: A Review

Gupta

Gandhi

2023

BioTech

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Soil–water pollution is of serious concern worldwide. There is a public outcry against the continually rising problems of pollution to ensure the safest and healthiest subsurface environment for living beings. A variety of organic pollutants causes serious soil–water pollution, toxicity and, therefore, the removal of a wide range of organic pollutants from contaminated matrix through the biological process rather than physico-chemical methods is an urgent need to protect the environment and public health. Being an ecofriendly technology, bioremediation can solve the problems of soil–water pollution due to hydrocarbons as it is a low-cost and self-driven process that utilises microorganisms and plants or their enzymes to degrade and detoxify pollutants and thus, promote sustainable development. This paper describes the updates on the bioremediation and phytoremediation techniques which have been recently developed and demonstrated at the plot-scale. Further, this paper provides details of wetland-based treatment of BTEX contaminated soils and water. The knowledge acquired in our study contributes extensively towards understanding the impact of dynamic subsurface conditions on engineered bioremediation techniques.

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“…Furthermore, TCA can threaten potable water resources and natural ecosystems, and the problem could be remediated through physical-chemical and/or biological technologies ( Connon et al, 2005 ). Before remediation technologies are applied to contaminated groundwater, the transport and transformation characteristic of chlorinated aliphatic hydrocarbons (CAHs) in the groundwater must be investigated ( Powell et al, 2014 ).…”

Section: Introductionmentioning

confidence: 99%

Natural attenuation model and biodegradation for 1,1,1-trichloroethane contaminant in shallow groundwater

et al. 2015

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Natural attenuation is an effective and feasible technology for controlling groundwater contamination. This study investigated the potential effectiveness and mechanisms of natural attenuation of 1,1,1-trichloroethane (TCA) contaminants in shallow groundwater in Shanghai by using a column simulation experiment, reactive transport model, and 16S rRNA gene clone library. The results indicated that the majority of the contaminant mass was present at 2–6 m in depth, the contaminated area was approximately 1000 m × 1000 m, and natural attenuation processes were occurring at the site. The effluent breakthrough curves from the column experiments demonstrated that the effectiveness of TCA natural attenuation in the groundwater accorded with the advection-dispersion-reaction equation. The kinetic parameter of adsorption and biotic dehydrochlorination of TCA was 0.068 m3/kg and 0.0045 d–1. The contamination plume was predicted to diminish and the maximum concentration of TCA decreased to 280 μg/L. The bacterial community during TCA degradation in groundwater belonged to Trichococcus, Geobacteraceae, Geobacter, Mucilaginibacter, and Arthrobacter.

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Degradation kinetics of chlorinated aliphatic hydrocarbons by methane oxidizers naturally-associated with wetland plant roots

Cited by 12 publications

References 43 publications

Assessing a Large-Scale Sequential In Situ Chloroethene Bioremediation System Using Compound-Specific Isotope Analysis (CSIA) and Geochemical Modeling

Assessing a Large-Scale Sequential In Situ Chloroethene Bioremediation System Using Compound-Specific Isotope Analysis (CSIA) and Geochemical Modeling

Bioremediation of Organic Pollutants in Soil–Water System: A Review

Natural attenuation model and biodegradation for 1,1,1-trichloroethane contaminant in shallow groundwater

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