Anaerobic pretreatment and increased solid destruction for vegetable solid waste codigested with cattle slurry.

Municipal solid waste and industrial solid waste are considered to be a large quantity of organic fraction which have contributed to different levels of pollution on land and ground water. The present study was carried out for the determination of characteristics of vegetable solid wastes, cattle slurry and sewage sludge for effective anaerobic co-digestion. The objective of the work was to study the treatability of vegetable solid wastes by co-digestion with municipal sewage and cattle slurry in different ratios. The laboratory batch scale studies were carried out to determine effects of various process parameters on startup and digestion. The pretreatment on solid waste has resulted in effective co-digestion of vegetable solid waste and hence showed increased biogas yield. The optimum ratio of vegetable wastes to inoculum (cow dung and anaerobic sewage sludge in the ratio of 1:1) was found to be 1:2 for effective co-digestion and maximum biogas yield.