Determination of in situ biodegradation rates via a novel high resolution isotopic approach in contaminated sediments

Gilevska, Tetyana; Passeport, Elodie; Shayan, Mahsa; Seger, Edward S.; Lutz, E. J.; West, Kathryn A.; Morgan, Scott A.; Mack, E. Erin; Lollar, Barbara Sherwood

doi:10.1016/j.watres.2018.11.029

Cited by 25 publications

(14 citation statements)

References 24 publications

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“…

{Da}_{4} = \frac{λ_{4} {l_{4}}^{2}}{{D_{4}}^{*}}

is Damköhler number in the bioturbation layer. The experimental data from Gilevska et al showed that biodegradation rate of contaminant in bioturbation layer ranges from 0.4 to 84 year −1 . Damköhler number in the bioturbation layer ( Da 4 ) here is assumed to be 1, 5, 10, and 30, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The range of biodegradation rate in bioturbation layer is assumed to be from 0.4 to 84 year −1 . The corresponding half‐life in the bioturbation layer t 1/2,bio ranges from 0.008 to 1.73 years . The flux at surface of system is significantly reduced with a decrease of half‐life of contaminant.…”

Section: Resultsmentioning

confidence: 99%

“…The corresponding half-life in the bioturbation layer t 1/2,bio ranges from 0.008 to 1.73 years. 74 The flux at surface of system is significantly reduced with a decrease of half-life of contaminant. For example, the maximum flux for the case with t 1/2,bio = 0.07 year can be 4.5 times less than that of the case without considering the effect of biodegradation ( Figure 7A).…”

Section: Dimensionless Analysis Of Contaminant Diffusion In Capped mentioning

confidence: 99%

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An analytical model for chemical diffusion in layered contaminated sediment systems with bioreactive caps

Yan

Xie

et al. 2019

Num Anal Meth Geomechanics

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Summary An analytical model for contaminant transport in multilayered capped contaminated sediments including the degradation of organic contaminant is presented. The effect of benthic boundary layer was treated as a Robin‐type boundary condition. The results of the proposed analytical model agree well with experimental data. The biodegradation of contaminant in bioturbation layer shows a significant influence on the flux at the surface of system. The maximum flux for the case with t1/2,bio = 0.07 year can be 4.5 times less than that of the case without considering the effect of biodegradation. The thickness of bioturbation layer has a significant effect on the performance of the capped contaminated sediment. The maximum flux for the case with lbio = 15 cm can be 17 times larger than that of the case without bioturbation layer. This may be because the effective diffusion coefficient of sand cap can be 28 times lower than Dbio. The mass transfer coefficient should be considered for the design of the capping system as the contaminant concentration at the top of system for the case with kbl = 2.5 × 10−5 cm/s can be 13 times greater than that of the case with kbl = 10−4 cm/s. The proposed analytical model can be used for verification of complicated numerical methods, evaluation of experimental data, and design of the capping contaminated sediment systems with reactive cap layers.

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“…

{Da}_{4} = \frac{λ_{4} {l_{4}}^{2}}{{D_{4}}^{*}}

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Dimensionless Analysis Of Contaminant Diffusion In Capped mentioning

confidence: 99%

See 1 more Smart Citation

An analytical model for chemical diffusion in layered contaminated sediment systems with bioreactive caps

Yan

Xie

et al. 2019

Num Anal Meth Geomechanics

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“…After total organic carbon was used up, sulfate reduction and methanogenesis occurred and PAH depletion was up to 40% higher relative to controls. Gilevska et al (2019) reported on a way to estimate benzene biodegradation rates in contaminated sediment. They tracked disappearance of benzene isotopes and enrichment of daughter products.…”

Section: Biodegradationmentioning

confidence: 99%

Contaminated aquatic sediments

Jaglal¹

2020

Water Environment Research

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Jawed and Krantzberg (2019) identified best practices to follow when remediating sediment sites based on experience gained at the Randle Reef Site in Ontario, Canada. The authors identify a list of challenges to overcome that fall under a broad series of headings that include issues associated with social, regulatory, political, and technical topics. Bianchini, Cento, Guzzini, Pellegrini, and Saccani (2019) reviewed more than 150 historical articles, written over the previous 50 years, to identify alternative

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“…Before reaching surface water, these groundwater pollutants must transit the aquifer-river interface or hyporheic zone (HZ) where groundwater and surface water interact (Boano et al, 2014;Cardenas, 2015). The HZ offers considerable promise as a passive biobarrier for in-situ 'treatment' of a broad range of organic groundwater pollutants (Schaper et al, 2018;Gilevska et al, 2019) including CEs (Weatherill et al, 2018). HZ sediments are often naturally rich in organic matter, resulting in hypoxic or anoxic pore water conditions (Atashgahi et al, 2015) where CEs (such as TCE) and NO are important terminal electron acceptors (TEAs) in dissimilatory microbial metabolism.…”

Section: Introductionmentioning

confidence: 99%

Revealing chlorinated ethene transformation hotspots in a nitrate-impacted hyporheic zone

et al. 2019

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Hyporheic zones are increasingly thought of as natural bioreactors, capable of transforming and attenuating groundwater pollutants present in diffuse baseflow. An underappreciated scenario in the understanding of contaminant fate hyporheic zones is the interaction between point-source trichloroethene (TCE) plumes and ubiquitous, non-point source pollutants such as nitrate. This study aims to conceptualise critical biogeochemical gradients in the hyporheic zone which govern the export potential of these redox-sensitive pollutants from carbon-poor, oxic aquifers. Within the TCE plume discharge zone, discrete vertical profiling of the upper 100 cm of sediment pore water chemistry revealed an 80% increase in dissolved organic carbon (DOC) concentrations and 20-60 cm thick hypoxic zones (<2 mg O2 L-1) within which most reactive transport was observed. A 33% reduction of nitrate concentrations coincided with elevated pore water nitrous oxide concentrations as well as the appearance of manganese and the TCE metabolite cis-1,2-dichloroethene (cDCE). Elevated groundwater nitrate concentrations (>50 mg L-1) create a large stoichiometric demand for bioavailable DOC in discharging groundwater. With the benefit of a high-resolution grid of pore water samplers investigating the shallowest 30 cm of hypoxic groundwater flow paths, we identified DOC-rich hotspots associated with submerged vegetation (Ranunculus spp.), where lowenergy metabolic processes such as mineral dissolution/reduction, methanogenesis and ammonification dominate. Using a chlorine index metric, we show that enhanced TCE to cDCE transformation takes place within these biogeochemical hotspots, highlighting their relevance for natural plume attenuation.

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Determination of in situ biodegradation rates via a novel high resolution isotopic approach in contaminated sediments

Cited by 25 publications

References 24 publications

An analytical model for chemical diffusion in layered contaminated sediment systems with bioreactive caps

An analytical model for chemical diffusion in layered contaminated sediment systems with bioreactive caps

Contaminated aquatic sediments

Revealing chlorinated ethene transformation hotspots in a nitrate-impacted hyporheic zone

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