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There is a tremendous demand for developing efficient methods for arsenic removal from drinking waters due to its severe toxicity effect on living beings. In order to predict an appropriate technique ...for arsenic removal from groundwater a numerical model that is able to describe the removal of arsenic and other background species from the groundwater considering chemical and biochemical processes has been developed in the present paper. Based on the adsorption/co-precipitation of arsenic with iron(III) hydroxides, the behavior of arsenic and iron under oxidation dominant environment including advection, dispersion, molecular diffusion and the microbially mediated chemical processes are also presented. The arsenic transport equation and the balance equations are solved numerically using the finite difference method and method of characteristics (MOC), subject to prescribed initial and boundary conditions are also presented. The kinetic sub model describes the heterotrophic metabolisms of several groups of microorganisms. Microbial growth is assumed to follow Monod type kinetics. The results of the removal simulation model demonstrated that availability of substrate (e.g. organic carbon), maximum growth rate, yield coefficient of bacteria, the precipitation rate of iron-hydroxide and the adsorption/precipitation rate of arsenic with iron hydroxide were important parameters which affected the removal of arsenic from groundwater. Among all the parameters organic carbon concentration proved as the most important.続きを見る
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