1. Volume Reduction: By removing a large amount of water from the sludge, its weight and volume are reduced, facilitating subsequent treatment or disposal.
2. Stabilization: During the drying process, the sludge dryer can kill some pathogens in the sludge, reducing its biological activity and making it more stable.

3. Resource Utilization: Dryed sludge is easier to utilize further, such as as fertilizer, soil conditioner, or energy (e.g., incineration).
4. Detoxification: High-temperature drying can destroy certain harmful substances, reducing the toxicity of the sludge.
5. Storage and Transportation: Dried sludge is easier to store and transport, reducing the risk of secondary pollution.