For KW mono- and co-digestion with CS, CM, or their mixture, methane production performance was better at an S/I ratio of 1.5 than that of 3.0. Therefore, KW had the highest biodegradability of 94% as compared with CS (45%) or CM (47%). The results showed that BMP and specific methane yields were 725 and 683 mL g –1 VS added for KW, 470 and 214 mL g –1 VS added for CS, and 617 and 291 mL g –1 VS added for CM, respectively. The modified Gompertz equation was used to assist in the interpretation of the conclusions. An initial volatile solid concentration of 3 g VS L –1 with a substrate-to-inoculum (S/I) ratio of 0.5 was first tested, and two S/I ratios of 1.5 and 3.0 were evaluated subsequently. Anaerobic mono- and co-digestion of kitchen waste (KW), corn stover (CS), and chicken manure (CM) under mesophilic (37 ☌) conditions were conducted in batch mode with the aim of investigating the biomethane potential (BMP), biodegradability, methane production performance, and stability of the process.
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