Improved of biogas production by anaerobic co-digestion of Ziziphus leaves and cow manure wastes

Abstract

This study aimed to use low cost materials and environmentally friendly approach to product biogas by anaerobic co-digestion from agriculture waste and animal waste and evaluate the cumulative biogas and methane yield at optimal operating condition at different substrates mono and co-digestion. For this purpose, biogas production from anaerobic co-digestion of locally organic wastes such as Ziziphus leaves waste (ZLW) and Cow manure waste (CMW) in laboratory scale batch reactor, the organic wastes (ZL), and (CM) were characterized by Kjeldahl analysis system. The effects of Mass ratio, Dilution water and pH solution treatment value for difference type of agriculture waste on the biogas production were taken into full consideration. The results showed the ultimate accumulative of biogas yield from co-digesting at optimum condition was estimated to be 4090 and 2380 mL/g VS, for Co-digestion (ZL:CM) and Mono-digestion (CM), respectively. A higher rate of methane concentration was observed at mesophilic condition, which was estimated to be 67.64 and 52.60%, for Co-digestion (ZL:CM) and mono-digestion (CM), respectively. It can be concluded that the addition of ZL:CM in Co-digester is more significant in increasing the methane concentration and biogas production compared to a mono-digester (CM). This study was analyzed by using a kinetic modified Gompertz model for entire digestion process to get the best fits the experimental data.