Optimizing anaerobic co-digestion of goat manure and cotton gin trash using biochemical methane potential (BMP) test and mathematical modeling

Abstract Anaerobic co-digestion is widely adopted to enhance process efficacy by balancing the C/N ratio of feedstock while converting organic wastes biomethane. Goat manure (GM) and cotton gin trash (CGT) were anaerobically co-digested in triplicate batch bioreactors. The was optimized evaluated utilizing mathematical equations. liquid fraction digestate analyzed for nitrate phosphate. co-digestions with 10 20% CGT having ratios 17.7 19.8 yielded highest statistically similar 261.4 ± 4.8 262.6 4.2 mL/g vs biomethane, respectively. biodegradability (BD) GM 94.5 2.7 37.6 0.8%, BD decreased proportionally an increase percentage. 10% 80–90% biomethane 26–39 d. modified Gompertz model-predicted experimental values similar. synergistic effect index 15.6 4.7% observed GM/CGT; 30:70 co-digestion. concentration phosphate lower than feedstocks, indicating that these nutrients stay solid fraction. results provide important insights agro-waste management, further studies determining effects effluent application on plants need be conducted.