Enhancing the Production of Biogas through Anaerobic Co-Digestion of Commercial and Animal Wastes

With the expansion of commercial centers such as hotels, restaurants, markets, etc., the amount of waste generated by these institutions has become an important challenge in large cities. On the other hand, the application of new biotechnologies to convert biodegradable waste into valuable materials such as biogas and other biofuels is increasing dramatically. The aim of this study was to investigate the potential of biogas production from a mixture of cow dung and restaurant wastes using an anaerobic bioreactor. Operational parameters such as pH, Carbon to Nitrogen ratio (C/N), mixing ratio of restaurant and cow wastes in weight percentage (۰:۱۰۰, ۵۰:۵۰, ۷۰:۳۰, and ۱۰۰:۰), total solids (TS) (%۵, %۱۰, and %۲۰), temperatures (۳۵, ۴۵ and ۵۵ °C) and Oxidation-Reduction Potential (ORP) were evaluated. The results showed that the maximum yield and percent of the biogas produced from cow manure digestion separately was ۱۰۰۳ mL/day and %۵۲.۸۲. Digestion of the mixing of restaurant and cow wastes showed the best mixing ratio, total solid and temperature were ۷۰:۳۰ (w/w), %۲۰ and ۵۵°C respectively, and biogas production yield and percent was obtained ۵۴۳۰ mL/day and %۷۴.۴ respectively. The ORP obtained in this study was -۳۲۷ millivolt (mv), which indicates the appropriate conditions of the anaerobic process in biogas production and confirmation of methanogenesis.

کلیدواژه ها:

Food wastes ، Animal wastes ، Anaerobic digestion ، Biogas