Abstract: In order to explore the feasibility of replacing part of the food waste aerobic composting conditioner with compost returns， a pilot-scale two-step composting process combined DANO dynamic composting and static composting was used to carry out the experiment. Sawdust and rice straw were mixed with recycled materials respectively， and the effects of different proportions （0%，10%， 20% and 30%） of recycled materials （marked as M1， MH1-1， MH1-2， MH1-3， D1， DH2-1， DH2-2 and DH2-3） on aerobic composting were analyzed. The results showed that DANO could make the compost temperature rise rapidly， and the addition of recycled material could promote the temperature rise. Seven batches of DANO could maintain the compost temperature above 55 ℃ for more than twelve days. The greater the amount of recycled material added， the lower the easily degradable organic matter， and the slower the degradation rate. The average C/N reduction rates of sawdust and straw were 5.42% and 40.31%， respectively. The addition of recycled materials could reduce the biological toxicity of the pile（The GI of eight batches were 48.35%， 66.23%， 54.78%， 52.43%， 71.89%， 80.89%， 73.12% and 66.86%）， improve the maturity， and thus increased the GI. When the initial C/N， the amount of recycled material and the initial moisture content were controlled at 19∶1～24∶1， 10%～20% and 55%～60%， respectively， the core technical indicators of the two-step composting product met the requirements of NY/T 525—2021 Organic Fertilizer.

Key words: kitchen waste, DANO roller, aerobic composting, recycled materials, indicator