Abstract: The hydrolytic acidification liquid of kitchen waste contained rich volatile fatty acids (VFA), lactic acid and other degradable organic substances, which had good biodegradability. It could not only produce biogas through anaerobic digestion, but also be used as a substitute for traditional sewage treatment systems external carbon sources, with a wide industrial application market. Therefore, the hydrolysis acidification treatment technology of kitchen waste is the key condition for its efficient resource utilization, and the effect of hydrolysis acidification would directly affect the subsequent resource utilization rate. A large-scale kitchen waste treatment project in Zhejiang province was taken as an experimental platform, the treatment effects of bio-hydrolysis reactor under two processes of leaching and no leaching and no filtration were compared, and the main factors affected the effect of bio-reactor, such as residence time and reaction temperature were explored. The experimental results showed that compared to the leaching process, the no leaching and no filtration process could increase the reactor reduction rate by 4.17%, increase the key indicators of COD in the hydrolysate by 7.49%, and increase volatile fatty acids(VFA) by 19.30%. Moreover, the no leaching and no filtration process could optimize the reactor design and reduce its construction and operation costs. Under the no leaching and no filtration process, with a residence time of two days and a reaction temperature of 35 ℃, the extruded effluent had a pH of 4.87, COD of 129 200 mg/L, VFA of 23 691 mg/L, TN of 3 128 mg/L, and NH3-N of 1 011 mg/L.

Key words: biohydrolysis, kitchen waste, not drenched or filtered, stay time, temperature