By M. Yavuz Corapcioglu
This e-book is the 3rd quantity of a chain: ''Advances in Porous Media''. Our target is to provide in-depth evaluate papers that supply complete assurance to the sphere of delivery in porous media. This sequence treats shipping phenomena in porous media as an interdisciplinary subject. therefore, ''Advances in Porous Media'' will proceed to advertise the extension of rules and purposes in a single region to others, slicing throughout conventional obstacles. the target of every bankruptcy is to check the paintings performed on a selected subject together with theoretical, numerical in addition to experimental reviews. The individuals of this quantity, as for prior ones, come from a number of backgrounds: civil and environmental engineering, and earth and environmental sciences. The articles are geared toward all scientists and engineers in numerous different fields eager about the basics and functions of methods in porous media.
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Additional resources for Advances in Porous Media, Vol. 3
4,6. Models of microbial growth A given microbial population consists of individual cells, each carrying out a complex array of chemical reactions necessary to survive. However, a description of all of the processes occurring in the microbial population is not practical, so models have been developed to describe how the average population behaves. Microorganism population growth can be described in several ways, depending on the assumptions made about the population as a whole. The descriptions of the different growth models given below are based on the treatment by Bailey and Ollis (1986).
The metabolic pathways necessary to survive in the new conditions. A lag in growth may also occur when microorganisms are transferred into an environment of different ionic strength. Multiple lag periods are sometimes observed when a culture is fed two substrates, one of which is preferentially utilized. A lag occurs when the organism switches from the exhausted preferred substrate to the second substrate. 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).
Growth of pseudomonad bacteria, a genus known to degrade a variety of organic compounds, is usually optimal at Modeling subsurface biodegradation 27 temperatures between 25 and 30°C (Focht, 1988), whereas groundwater temperatures can be significantly lower. Dibble and Bartha (1979) found that biodegradation of oil sludge in soil was negligible at 5°C, occurred only after a two-week lag period at 13°C, but was significant above 20°C. 5 to 3. In a review, Atlas (1981) reported that the rate of oil biodegradation was affected by temperature, although the ultimate extent of transformation of petroleum compounds was not.