Smart Solution for Thermal Sludge Drying
Hollow Shaft Paddle Dryer
How It Works
Process
Indirect Heat Transfer via Paddles
Heat transfer fluid circulates through the hollow shaft and paddle interior, heating the paddle surface which then transfers heat directly to the sludge material in contact with it no direct flame or hot air contact with product.
Continuous Mixing & Advancement
Counter-rotating shafts with interlocking paddles simultaneously mix the sludge and convey it along the trough length, ensuring every part of the material is consistently exposed to hot surfaces.
Working Principle
Temperature Regulation
Heat input is precisely controlled by adjusting the temperature and flow of the heat transfer fluid, allowing the drying profile to be tuned to the material’s thermal sensitivity and target outlet moisture.
Discharge of Dried Product
Material exits the far end of the trough at 90–95% dry solids and discharges into downstream handling, storage, or disposal systems.
Closed Vapor Management
Moisture evaporated from the sludge is drawn off through a controlled vapor outlet and directed to a condenser or scrubber, preventing odor release and maintaining a hygienic operating environment.
This Is Why
We Should Use Hollow Shaft Paddle Dryer
High Thermal Efficiency
Indirect paddle heating maximizes the ratio of heat transferred to sludge versus heat lost to surroundings, reducing energy cost per tonne of water evaporated.
Closed & Odor-Controlled
Fully enclosed design with managed vapor exhaust eliminates open odor emission — suitable for installation within plant buildings.
Compact Footprint
High heat transfer surface area packed into a small trough volume means significantly lower floor space requirement than rotary or belt dryers at equivalent throughput.
Scalable Capacity
Shaft length and number of shafts can be configured to meet throughput from 0.1 TPD pilot scale up to 50 TPD industrial installations
Compatible with Multiple Heat Sources
Operates on steam, thermal oil, or hot water/air — integrates with existing plant utilities or dedicated heat generation systems.
Stable Operation
Slow shaft rotation and robust paddle construction result in reliable, low-vibration operation with extended service intervals.
0.1–50 TPD
Capacity
90–95%
Drying
Compact
Footprint
Overview
A Robust Thermal Drying System
Best suited for facilities requiring thermal drying to high dry solids within a controlled, low-footprint environment
0.1–50 TPD
Capacity
90-95%
Drying
Closed
System
Technical Specifications
Capacity Range
0.1–50 TPD (scalable
Final Dry Solids
90–95%
Heat Transfer Method
Indirect — hollow shaft and paddle surface
Heat Transfer Medium
Steam, Thermal Oil, or Hot Water
Operation Mode
Continuous
Vapor Management
Closed system with condenser/scrubber outlet
Footprint
Compact — high surface area to volume ratio
Control System
PLC-based temperature and flow control
Applications
Ideal Applications
Municipal and Industrial Sewage Treatment Plants
Chemical & Pharmaceutical Sludge
Food Processing Waste and Biosolids
Distillery and Brewery Spent Wash
Paper & Pulp Mill Sludge
Fertilizer and Organic Waste Processing
Get Started
Interested in Thermal Paddle
Drying?
Get a customized system engineered for your specific capacity, sludge type, and operational requirements