Abstract: A kitchen waste treatment project in China has adopted three dry anaerobic fermentation technologies, including Kompogas horizontal push flow single axis stirring, TTV tunnel kiln single axis stirring, and Dranco vertical cone bottom forced circulation stirring, to recycle kitchen waste with high organic matter content in urban waste classification. By comparing the equipment integration and operating parameters of three dry anaerobic technologies, their technical application characteristics and advantages were analyzed and explored. By comparing the process and equipment characteristics, TTV and Dranco medium temperature dry anaerobic systems could achieve more stable operating parameters, which were superior to Kompogas high-temperature dry anaerobic systems. The blade of TTV anaerobic tank was set to fit the tank body, which could effectively avoid the deposition of heavy substances and prevent blockage of discharge. Dranco vertical anaerobic tank ensured the homogeneity of materials through forced circulation and achieved rapid inoculation. The sludge dewatering process used vibrating screens, spiral extruders, and centrifugal dewatering machines for more stable results. By comparing the operating parameters and indicators, TTV and Dranco achieved stable operation at full load. The VS degradation ratio of the three anaerobic technologies were basically the same. The key evaluation indicators of TTV have obvious technical advantages, with a volumetric gas production rate of 5.44 m3/m3, an anaerobic tank feed volatile solid load (based on VS) of 10.47 kg/（m3·d）, and a volatile solid decomposition rate of 75.77%. Both TTV and Dranco achieved high solid content in dehydrated residue, with an average of 37.31% and 37.19%, respectively. In combination with the actual processing volume of kitchen waste, the biogas slurry production and solid content of TTV were lower than those of Kompogas and Dranco. Through economic comparison, the management and maintenance cost of TTV was 16.2 yuan per ton, and the operating consumption cost was 33.42 yuan per ton, which was significantly better than Kompogas and Dranco.

Key words: dry anaerobic, kitchen waste, amount of dry matter, volatile solid load, volumetric gas production rate