A modeling approach integrating microbial activity, mass transfer, and geochemical processes to interpret biological assays: An example for PCE degradation in a multi-phase batch setup

Abstract

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Integrating Process‐Based Reactive Transport Modeling and Machine Learning for Electrokinetic Remediation of Contaminated Groundwater

“…C O H ), a negatively charged substrate, is electrokinetically delivered from a cathodic electrode to promote the biodegradation of the chlorinated contaminants initially present in the subsurface. The delivery of lactate stimulates the microbial activity of indigenous organohalide-respiring bacteria (OHRB), which are able to sequentially degrade tetrachloroethylene (PCE), the chlorinated compound initially present in the domain, to trichloroethylene (TCE) and dichloroethylene (DCE) (Buttet et al, 2018;Murray et al, 2019;S. Yu et al, 2005).…”

“…Lactate (), a negatively charged substrate, is electrokinetically delivered from a cathodic electrode to promote the biodegradation of the chlorinated contaminants initially present in the subsurface. The delivery of lactate stimulates the microbial activity of indigenous organohalide‐respiring bacteria (OHRB), which are able to sequentially degrade tetrachloroethylene (PCE), the chlorinated compound initially present in the domain, to trichloroethylene (TCE) and dichloroethylene (DCE) (Buttet et al., 2018; Murray et al., 2019; S. Yu et al., 2005). Specialized OHRB (KB‐1), able to perform complete dehalogenation of chlorinated solvents including the conversion of DCE to vinyl chloride (VC) and subsequently to the non‐toxic ethene, are distributed with the electroosmotic flow from the anode to the cathode.…”

Chlorinated ethene plume evolution after source thermal remediation: Determination of degradation rates and mechanisms

“…Some SRB are facultative and can use electron acceptors other than sulfate, which could explain their ubiquitous distribution in the plume (Castro et al, 2000). Sulfate reduction has been shown to inhibit organohalide respiration (Berggren et al, 2013;Murray et al, 2019), but has also in some cases stimulated dechlorination (Harkness et al, 2012;Murray, 2019). The two processes, sulfate reduction and DCE dechlorination, have been documented to occur concurrently by geochemical and microbial community analysis in a constructed wetland, which is similar to the Rødekro plume in that it is an anoxic, sandy environment (Imfeld et al, 2010).…”

Coupling Genomics and Hydraulic Information to Predict the Nitrogen Dynamics in a Channel Confluence

“…Such a simplification could be reasonable it is applied to systems with weak transport processes, such as oceans, deep reservoirs, and soil. Nevertheless, the complicated flow field in urban channel confluences would directly determine the transport processes such as mass transfer between different phases (water column and sediment), molecular diffusion, and hydrodynamic dispersion, which can turn transport processes into the rate-limiting steps and thus be the bottleneck for the biogeochemical processes . Therefore, establishing a modeling system combining the hydraulic information and molecular biological information to simulate both the transport and transformation processes is vital for the accurate prediction and quantitative description of the nitrogen dynamics in river systems.…”