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Biofilm Growth and Mineral Precipitation in Synthetic Leachate Columns |
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| Authors: | A J Cooke R K Rowe B E Rittmann J VanGulck S Millward |
| Affiliation: | 1Fellow, ASCE 2Member, ASCE 31Grad. Student, Dept. of Civ. and Envir. Engrg., Univ. of Western Ontario, London, ON, Canada. 42Prof. and Vice-Prin. (Res.), Queen's Univ., Kingston, ON, Canada K7L 3N6. 53Prof., Dept. of Civ. Engrg., Northwestern Univ., Evanston, IL. 64Grad. Student, Dept. of Civ. Engrg., Queen's Univ., Kingston, ON, Canada K7L 3N6. 75Grad. Student, Dept. of Civ. and Envir. Engrg., Univ. of Western Ontario, London, ON, Canada. |
| Abstract: | The results of a numerical model developed to describe the clogging of the leachate collection systems are compared with data from column experiments conducted with synthetic landfill leachate. A biofilm kinetic model is used to calculate the utilization of organic substrates (acetate and propionate) and growth of active clog material, and the substrate removal is then linked to mineral precipitation. Calculated changes in the chemical oxygen demand and Ca2+ of the effluent leachate and the porosity profiles along the length of the column show encouraging agreement with measured values. Means to obtain reasonable parameter values are presented. The favorable outcome represents completion of an essential first step toward being able to predict what controls clogging in landfill leachate collection systems. |
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