Laserfiche WebLink
' Lo - V(DVO - v0) - Mt.k+F H 0 (5) <br /> at [Kh - H [Ka + o} <br /> where <br /> D=dispersion tensor <br /> v=ground water velocity vector <br /> Rh= retardation factor for hydrocarbon <br /> The exchange of microorganisms between the solid surface and the free solution was assumed to <br /> be rapid and follow a linear relationship with total concentration The movement of microorganisms was <br /> simulated using a simple retardation factor approach (Freeze and Cherry, 1979) <br /> aMs - V(DVM - vM) H O <br /> a k • M eke (Kh+ H) (Ko O) (6) <br /> Kc•Y•OC <br /> - b•Ms <br /> R <br /> m <br /> where Ms= concentration of microbes in solution <br /> M.=concentration of microbes attached to solids <br /> K,,,= ratio of microbes attached to microbes in solution <br /> R, = microbial retardation factor <br /> M,= K„ 'M. <br /> Mt=Ms +M, <br /> _ (1 +KJ-M, <br /> = <br /> R.-Ms <br /> 1.2 2 One-Dimensional Simulations <br /> ' Studies with the one-dimensional solution indicated that there are three general regions where <br /> different processes control the rate and extent of degradation Figure 1 1 shows the location of these <br /> regions and the variation in oxygen and hydrocarbon with distance The rate of biodegradation will be very <br /> ' high in the region closest to the source where a large microbial biomass will develop and result in nearly <br /> complete removal of oxygen <br /> 1-5 <br />' 1 <br />