Modeling of solute transport and biological sulfate reduction using low cost electron donor |
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| Authors: | Osama Eljamal Kenji Jinno Tosao Hosokawa |
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| Institution: | (1) Institute of Environmental Systems, Graduate School of Engineering, Faculty of Engineering, Kyushu University, 744, Motooka, Nishii-ku, Fukuoka 819-0395, Japan;(2) Department of Civil and Urban Design Engineering, Faculty of Engineering, Kyushu Sangyo University, 3-1 Matsukadai 2-chome, Higashi-ku, Fukuoka 813-8503, Japan |
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| Abstract: | Serial data from soil–sawdust column experiments were used to develop a mathematical model to describe the biological sulfate
reduction processes in porous media. The mathematical model numerically solves the equation of solute transport in one-dimensional
saturated state. Solute transport is coupled to sulfate reducing bacteria sub model. Bacterial growth is assumed to follow
double Monod kinetic equation. Two bacterial groups (X1 and X2) were described. Bacterial group X1 uses under aerobic conditions
oxygen and under anaerobic conditions nitrate as electron acceptor. Under anaerobic conditions bacterial groups X2, use sulfate
as an electron acceptor. Sulfate rich wastewater is usually deficient in electron donor and requires external addition of
electron donors in order to achieve complete sulfate reduction. The organic carbon as electron donor is one of the most important
factors that affect sulfate reduction bacterial activity. In this study the possible source of organic carbon is the solid
organic carbon supplied to the system in the form of sawdust. The results of this study indicate that sawdust could be employed
as low-cost materials to enhance the biological sulfate reduction processes in porous media. While the availability of organic
carbon as electron donor is one of the most important factors that affect the sulfate reducing bacterial activity in porous
media, this study demonstrates that using sawdust as a carbon source can improve the bacterial activity and increase the column
permeability. |
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| Keywords: | Sulfate reduction Electron donor Sawdust Bacterial growth Solute transport |
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