Abstract: The sludge drying and incineration technology has significant characteristics of sludge reduction, stabilization, and harmlessness, which has become a key research and important development direction in the field of sludge treatment and disposal in China. Whether from the perspective of process or investment, sludge drying equipment plays a crucial role in the success or failure of sludge disposal projects. Three sludge treatment processes using blade, thin film and disc drying technology were studied and discussed from the perspectives of equipment structure, material and energy balance, process flow, control methods and future thermal drying applications, in order to provide reference for the construction and technology selection of similar projects.

Key words: sludge drying, process calculation, system control, development and applications