The principle and requirement of sludge treatment in my country is to realize “reduction, stabilization, harmlessness and resource utilization”. The moisture content of the sludge after concentration and mechanical dehydration in the sewage plant is about 80%, but at this time the moisture content is still relatively high for the subsequent transportation, transfer and treatment. The volume and weight of the sludge are still large, and it is used for incineration The moisture content of the composted sludge is required to be lower than about 60%, and the moisture content of the sludge at this time obviously cannot meet the requirements. Sludge drying can reduce the moisture content of sludge to 30% to 50%, and the remaining substances after drying are relatively stable, the odor and pathogenic organisms are greatly removed, and the volume of sludge is reduced by 4 to 5 times. At the same time, its calorific value and nutritional content are retained. Therefore, sludge drying is the premise and key of sludge treatment and disposal technology.
Sludge thermal drying technology is currently the most important modern sludge drying technology. Its main working principle is to use the heat energy of flue gas, water vapor or industrial waste heat through an external heat source to exchange heat through the shell of the heat exchanger. Evaporate the moisture in the sludge to make it dry.

Sludge carbonization is a new type of sludge treatment technology, which can not only successfully realize the reduction, harmlessness and resource utilization of sludge, but also effectively fix the carbon source and produce carbon-based products for resource utilization, effectively solving the problem of The problem of poor bioavailability of sludge has become a research hotspot at home and abroad. Sludge carbonization methods can be divided into dry carbonization (pyrolysis method) and wet carbonization (hydrothermal carbonization). No matter which method is used, sludge carbonization needs to consume a lot of heat and electricity, and the problem of energy saving and consumption reduction in system operation needs to be solved.

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