Anaerobic co-digestion of grass and cow manure: kinetic and GHG calculations

Abstract

Grass is a highly desirable substrate for anaerobic digestion because of its higher biodegradability and biogas/methane yield. In this study, anaerobic co-digestion of grass, cow manure and sludge was studied under mesophilic conditions for 65 days. Experiments were performed on a feed ratio of grass/manure from 5 to 25%, respectively. The maximum cumulative biogas and methane yield was obtained as 331.75 mLbiogas/gVS and 206.64 mLCH4/gVS for 25% ratio. Also, the results of the experiments were tested on the three different kinetics model which are the first order kinetic model, modified Gompertz model and Logistics model. As a result of the study, it was found that by using grass nearly 480 × 106 kWh/year electricity may be produced and 0.5 × 106 tons/year CO2 greenhouse gas emission mitigation may be reached.

Anaerobic co-digestion of pressmud with vegetable waste in batch reactor for enhanced biogas production

“…Anaerobic co-digestion involves the simultaneous treatment of multiple organic substrates, which could be of diverse origin, composition, and complexity [12], [13]. By synergizing the digestion of various feedstocks, co-digestion holds the potential to improve biogas production rates, enhance process stability, and contribute to a circular economy model by valorising organic wastes [14], [15].…”