污泥和农牧废弃物厌氧共消化产甲烷特性研究OA

Anaerobic co-digestion is an effective way to solve the problem of low gas production caused by the imbalance of carbon and nitrogen in the process of anaerobic digestion of single waste.In this study,sludge,cow dung and corn straw were used as substrates for mesophilic semi-dry anaerobic co-digestion,and the effects of C/N on biogas production and biogas slurry properties were investigated.The results showed that when the multi-substrate mixes anaerobic digestion and C/N was 25,the reaction system operates stably and the gas production performance of the system was the best.The cumu-lative methane production was 490 mL·g-1VS,which was 121.7％,21.6％and 19.8％higher than that of pure sludge,pure cow dung and pure corn straw.The fitting results of the modified Gompertz model R2 were all greater than 0.99,which could better reflect the methane production process of anaerobic digestion.Among them,the methane production rate of C/N25 group was the highest,which was 38.50 mL·g-1 VSd-1,and the digestion time was shorter,which is 15.47 d.The actual methane production was greater than the theoretical methane production,which had a good synergistic effect.The removal rates of TS and VS in C/N 25 group were 38.7％and 43.7％,respectively,and the removal rate of VS was the highest in each group.The results of this study provide technical parameters and practical guidance for the efficient treatment and utilization of agricultural biomass waste.