Modelling Microbial Degradation Coupled to Reactive Transport in Groundwater: A Benchmark Analysis |
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Authors: | Clara Sena Jorge Molinero Shuji Ajima Norifumi Todaka |
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Institution: | 1. CVRM/Geo-Systems Centre ?C Instituto Superior T??cnico, Avenida Rovisco Pais, 1049-001, Lisbon, Portugal 2. Amphos 21 Consulting S.L., Passeig de Grac??a i Faria, 49-51, 08019, Barcelona, Spain 3. Electric Power Development Co., Ltd., 15-1, Ginza 6-Chome, Chuo-ku, Tokyo, 104-8165, Japan
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Abstract: | Microbes are ubiquitous in groundwater systems, and they play an important role in the redox state of groundwater and especially
on the fate of organic contaminants. In this context, numerical simulations that couple microbial processes to reactive transport
models are becoming more popular. In the present work, we revisit the mathematical ground of microbial redox reactions and
perform a benchmark analysis of the simulation of aerobic benzene degradation in a shallow and oxidizing aquifer. Numerical
results indicate that the two codes tested (one using the finite elements approach and the other using the finite differences
approach) lead to very similar results. In addition, the coupling of heterogeneous geochemical reactions to the benchmarked
example problem provides a solid basis for the understanding of the redox reactions and the changes on the carbon system triggered
by the aerobic degradation of benzene. |
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