Abstract: To solve the problem of low resourcelization rate of kitchen waste residue of the wet-type waste treatment plant and asparagus straw in Shanghai, a batch-scale experimental study on dry anaerobic co-digestion of kitchen waste residue and asparagus straw were carried out. The results showed that when the organic loading rates was set for 40 g/L (calculated in VS) and the C/N was 10.3, 13.4, 16.5, 19.6, 22.7, respectively, the highest maximum specific methanogenic activity (SMA) reached 18.01 mL/(g·d) (calculated in VS) when the C/N was 13.4, and the asparagus straw accounted for the dry mass ratio of the whole feedstock was 44.44%. The results of microbial community structure analysis showed that the main bacteria on the genus level in each experimental group were norank_ f_norank_o_n-orank_c_norank_ p_Firmicutes, norank_ f_ST-12K33, Fastidiosipila, norank_ f_Dethiobacteracea-e, etc. The main archaea on genus level were Methanobacterium and Methanosaeta, and the abundance of hydrogen-type methanogens (Metha-nobacterium) in the kitchen waste mono-digestion experimental group with a C/N of 10.3 was significantly lower than that of other dry anaerobic co-digestion experimental groups.

Key words: kitchen waste residue, asparagus straw, dry anaerobic co-digestion, methane production