摘要：Freshly collected garbage could easily be decomposed to biogas by anaerobic digestion and the spent residue to vermicompost, there by alleviating a major problem of sanitation and hygiene. The mode of pretreatment required preparing a substrate for anaerobic digestion varies with composition and physical consistency of the feedstock. In this study an attempt has been made on feasibility of using lime as base for alkaline pretreatment to garbage and on an anaerobic digestion of garbage in conjunction with domestic sewage. The study was undertaken by operating laboratory scale digester of 10-litre capacity loaded with garbage after a pretreatment with lime for 24 hours. Assays were run in bio digester operated at room temperature with a constant hydraulic retention time of 25 days with different organic loading rates by varying the percentage lime pretreatment. The digester efficiency reflected as the methane yield decreases. Concerning the conversion efficiencies, the maximum gas yield of 0.22 m3 / Kgvs added was achieved at the organic loading rate of 3.34 kg vs / m3 / day, with pre treatment of 4 % lime.
