1、Impellar Heating And Drying：The drying process is realized by heating and drying system. The structure of the process mainly includes dryer, sludge feeder, auxiliary heat source, air system, heat recovery device, dust removal control, ash discharge control system, etc.
2 .Oxidation、High Temperature, Humidity And Drying：The sludge drying process and pure oxygen are simultaneously introduced into the temperature and pressure vessel of the demand reaction. Under the conditions of high temperature and high pressure, pure oxygen does not need to use the oxidized organic matter of the catalyst, and a small part of the remaining sludge can be dried through mechanical dehydration and drying, so as to achieve the purpose of drying. The sludge drying process is suitable for non-agricultural occasions, It can also be used as raw materials for secondary utilization of buildings.
3、Solar Drying：In this process, the dewatered sludge is evaporated by solar energy, and 60-80% of the sludge is dried by evaporation. At the same time, in the process of operation, the corner sludge is also spread on the floor by using the mixing wheel, and the forced ventilation can be increased to improve the evaporation efficiency. In general, this solar drying process has the advantages of simple process design, low investment and operation cost, and is more suitable for users who need low sludge output and long-term storage.
4、Air Heat Pump Drying：After the wet sludge is crushed, the extruded sludge enters the heat pump dryer. After the heat transfer in the air and thermal drying cycle changes qualitatively, the dry sludge heat drying circulating air wet low-temperature circulating air is sucked into the air heat pump circulation by the wet low-temperature circulating fan, which is blown from the circulating fan to the intermediate heat exchanger for heat transfer and evaporation to further reduce the temperature. The air flows from the intermediate heat exchanger and water-cooled cold pipe, Then reduce the temperature, the wind through the evaporator evaporation and condensation into water, precipitation, evaporation of the wind through the heat pump air intercooler heat return, raise the temperature of the air into the condenser, after heating, hot and dry air into the oven with sludge recycling. Heat pump drying has the advantages of low energy consumption, no secondary pollution, low drying temperature, high safety, high degree of automation and low sludge drying cost.