The sludge dryer project in Shijiazhuang, Hebei Province undertaken by Jiutian was completed and officially put into operation. The sludge dryer is a large-scale drying equipment developed based on the characteristics of sludge. After the sludge is dried, the physical and chemical properties of the sludge can be changed simultaneously. The moisture can be dried to about 20% at one time, and the volume is greatly reduced, making it convenient for storage, landfill, transportation, etc. Shijiazhuang sludge dryer is a drum dryer with a special design of the internal structure of the cylinder, which not only improves thermal efficiency, but also effectively avoids the adhesion and over-drying of sludge in the dryer. Its thermal efficiency is high, energy saving and environmental protection.