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Anaerobic mesophilic batch test of several organic wastes were carried out by a graphical statistic analysis (GSA) to evaluate their ultimate biodegradability and two distinctive decay rates (k1 and k2) with their corresponding degradable substrate fractions (S1 and S2). Each 3 L batch reactor was operated for more than 100 days at the substrate to inoculum ratio (S/I) of 0.5 as an initial total volatile solids (TVS) mass basis. Their Ultimate biodegradabilities were obtained respectively as follow; 69% swine waste, 45% dairy cow manure, 66% slaughterhouse waste, 79% food waste, 87% food waste leachate, 68% primary sludge and 39% waste activated sludge. The readily biodegradable fraction of 89% (S1) of Swine Waste BVS (So) degraded with in the initial 31 days with k1 of 0.116 day, where as the rest 11% slowly biodegradable fraction (S2) of BVS degraded for more than 100 days with the long term batch reaction rates (k2) of 0.004 day. For the Food Waste and Waste Activated Sludge, their readily biodegradable portions (S1) appeared 89% and 80%, which degrades with k1 of 0.195 day and 0.054 day for an initial 15 days and 28 days, respectively. Their corresponding long term batch reaction rates (k2) were 0.003 day and 0.002 day. Results from other organic wastes are addressed in this paper. The theoretical hydraulic retention times (HRTs) of anaerobic digesters treating organic wastes are easily determined by the analysis of multiple decay rate coefficients (k1 and k2) and their corresponding biodegradable substrate fractions (S1 and S2).

Ultimate Anaerobic Biodegradability and Multiple Decay Rate Coefficients of Organic Wastes