Modeling and Analysis of Biogas Generation Rate Sensitivity to Initial-pH, Leachate-Level and Ash-Loading during Anaerobic Biodegradation of Organic Solid Waste
American Journal of Chemical Engineering
Volume 2, Issue 3, May 2014, Pages: 21-27
Received: May 10, 2014;
Accepted: Jun. 3, 2014;
Published: Jun. 20, 2014
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William Wanasolo, Department of Chemical and Mining Engineering, College of Engineering and Technology, University of Dar es Salaam, Tanzania
Samwel Manyele, Department of Chemical and Mining Engineering, College of Engineering and Technology, University of Dar es Salaam, Tanzania
John Makunza, Department of Structural and Construction Engineering, College of Engineering and Technology, University of Dar es Salaam, Tanzania
Anaerobic biodegradation of solid waste food-residues mixed with fruit-waste was carried out at mesophilic conditions. The goal was to model the sensitivity of biogas generation rate to initial-pH, leachate-level and ash-loading. Two process parameters were analyzed at centre-points while the third factor was set at low-, mid- and high-levels. The simulation results showed that at initial-pH of 5 (low-level), the biogas generation rate was more sensitive to ash-loading than at high-level of initial-pH values. The minimum and maximum attainable biogas generation rates due to perturbations in ash-loading were 0.79 and 1.89 mL/min, respectively, representing a difference of 1.10 mL/min. A comparison using sensitivity quotient revealed that decreasing leachate-level had a stronger effect on biogas generation rate than increasing it. It was also found that the biodegradation process was over four-times more sensitive to variations in initial-pH than in ash-loading while it was over seven-times more sensitive to variations in initial-pH than in leachate-level. It was concluded that the sensitivity of biogas generation rate was highest to variations in initial-pH and least to variations in leachate-level.
Modeling and Analysis of Biogas Generation Rate Sensitivity to Initial-pH, Leachate-Level and Ash-Loading during Anaerobic Biodegradation of Organic Solid Waste, American Journal of Chemical Engineering.
Vol. 2, No. 3,
2014, pp. 21-27.
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