Advances in Porous Media, Vol. 3 by M. Yavuz Corapcioglu

By M. Yavuz Corapcioglu

This ebook is the 3rd quantity of a chain: ''Advances in Porous Media''. Our target is to offer in-depth overview papers that supply complete insurance to the sector of shipping in porous media. This sequence treats shipping phenomena in porous media as an interdisciplinary subject. hence, ''Advances in Porous Media'' will proceed to advertise the extension of rules and functions in a single quarter to others, slicing throughout conventional limitations. the target of every bankruptcy is to study the paintings performed on a selected subject together with theoretical, numerical in addition to experimental reports. The individuals of this quantity, as for earlier ones, come from quite a few backgrounds: civil and environmental engineering, and earth and environmental sciences. The articles are aimed toward all scientists and engineers in quite a few assorted fields fascinated by the basics and purposes of strategies in porous media.

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This phenomenon is called diauxic growth. The length of the lag period depends on many factors, including the type of organism, the organism's growth rate, the magnitude of the changing conditions, and the nature of the environmental change (Bailey and OUis, 1986). At the end of the lag period, the population of microorganisms is well adapted to its new environment. During this exponential period, microorganisms reproduce rapidly according to the expression (Bailey and Olhs, 1986) l^ ]^dX X dt Mrna (11) where X is the concentration of cells (M/L^); /i is the specific growth rate of cells (T~^); /Xmax is the maximum specific growth rate (T~^); t is the time (T).

The microorganisms will also begin acclimating to the Modeling subsurface biodegradation 17 new conditions created by the NAPL constituents. Because the NAPL components are Ukely to be different from the substrate the microorganisms normally metabolize, they must begin synthesizing new enzymes capable of acting on the dissolved NAPL constituents. In addition to being chemically different substrates, the NAPL constituents may affect other environmental conditions such as pH, redox potential, and ionic strength.

Solutes may become trapped in dead-end pores or other areas of low permeabiUty during the relatively slow movement of groundwater before remediation begins. When water carrying nutrients for in-situ bioremediation is pumped through the aquifer, the water will tend to flow through the large pores and may not mix with the trapped solute. Models that assume complete mixing of substrates and nutrients without taking diffusion effects into account could substantially overpredict biodegradation. Although intra-particle diffusion has not been exphcitly incorporated into any transport models reviewed for this report, it may be possible to model it as dispersion (Valocchi, 1985).

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