Comments on “Two-dimensional concentration distribution for mixing-controlled bioreactive transport in steady-state” by O.A. Cirpka and A.J. Valocchi |
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Authors: | Haibing Shao Florian Centler Cecilia De Biase Martin Thullner Olaf Kolditz |
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Institution: | 1. Department of Environmental Informatics, UFZ, Helmholtz Centre for Environmental Research – UFZ, Permoserstrasse 15, 04318 Leipzig, Germany;2. Department of Environmental Microbiology, UFZ, Helmholtz Centre for Environmental Research – UFZ, Permoserstrasse 15, 04318 Leipzig, Germany;3. Applied Environmental System Analysis, Dresden University of Technology, Helmholtzstrasse 10, 01069 Dresden, Germany |
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Abstract: | In this comment we present a re-analysis of the analytical solution presented by Cirpka and Valocchi for steady-state concentrations of dissolved bioreactive compounds and bacterial biomass in porous media. We discuss the validity range of the analytical solution. In particular, the criterion used to determine the sustainability of biomass is revisited. This re-analysis shows that the ω criterion used by Cirpka and Valocchi is only a necessary but not a sufficient criterion to determine the bioreactive zones. As a consequence, the analytical solution does not provide the exact distribution of compounds throughout the domain, but can serve as upper or lower boundaries for species concentrations at a given location. These conclusions are supported by the simulation results obtained from an established reactive transport model. |
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Keywords: | Bioreactive transport Mixing-controlled reactions Analytical solution Double-Monod kinetics |
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