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Transport of reactive species in heterogeneous porous media



Transport of reactive species in heterogeneous porous media



Journal of Hydrology (Amsterdam) 183(1-2): 151-168



In order to be able to extrapolate reactive pollutant transport behaviour from the laboratory experiment in the aquifer field scale it is necessary to combine the deterministic laboratory results with the stochastics of the field situation to produce effective macroscopic properties. For simple linear adsorption standard methods can be applied to arrive at effective retardation and dispersion parameters. Effective time-scales for chemical reactions such as adsorption and degradation may no longer be determined by the time-scales of processes on the molecular scale only but also by rate-limiting steps arising from the variable accessibility of reactive parts of the medium. For a bacterial degradation reaction it is suggested that an exchange coefficient between mobile water and reactive phase can parametrize subscale processes. The coefficient depends on the degree of heterogeneity of the medium.

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Accession: 003001423

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DOI: 10.1016/s0022-1694(96)80039-4


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