Sludge Dryer

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Henan Fote Heavy Machinery Co.,Ltd.

Henan, China

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Industrial and municipal sludge usuallycontains 80%–90% water, making it heavy and hard to transport. It also smells bad and can pollute soil and water. These problems make sludge handling difficult. To solve these issues, sludge dryers have become one of the most effective and widely used solutions.
What is a sludge dryer?
A sludge dryer (also known as a slurry dryer) is a high-efficiency machine designed to handle sludge with high moisture and viscosity. It can reduce sludge moisture from 80%–90% to less than 10%. This machine is commonly used in municipal wastewater treatment, industrial sludge drying, chemical plants, pharmaceutical factories, paper mills, electroplating factories, food factories, and more. A sludge dryer is essential for turning waste into useful material.
Main structure of the sludge dryer
The sludge drying system is compact and efficient. It includes the feeding system, drying drum, support device, drive unit, and other auxiliary equipment like feeder, conveyor, induced draft fan, hot air furnace, and dust collector. These parts work together in a complete sludge dryer wastewater treatment setup.
Main structure of the sludge dryer
1. Drying drum (Main body)
The drying drum is a horizontal rotary structure, installed with a 5% incline to aid material flow. At the feeding end, spiral plates guide wet sludge smoothly into the drum. Inside, lifters at angles like 90°, 135°, and 150° toss the sludge evenly into the hot airflow, enhancing heat contact and sludge drying efficiency. A retaining ring at the discharge end controls sludge retention time and flow speed.
2. Support system
The support system includes riding rings, rollers, and thrust rollers. Riding rings are fixed on the outer drum wall and rotate with it. The rollers support the entire weight of the drum, while thrust rollers, with a 5 mm clearance angle, prevent axial movement. This ensures safe, stable operation of the sludge dryer during continuous sludge drying processes.
3. Drive system
The drive unit consists of a motor, reducer, large gear, and pinion gear. The motor drives the reducer via a belt, transmitting power to the pinion, which meshes with the large gear on the drum to rotate it. The system offers smooth, low-noise operation and low energy consumption. Optional variable frequency control allows precise speed adjustment
4. Auxiliary equipment
Auxiliary systems include a feeder, feed conveyor, discharge conveyor, induced draft fan, hot air furnace, and dust collector. The feeder and conveyor deliver wet sludge to the main dryer. The furnace provides consistent heat using gas, biomass, or steam. The fan circulates hot air through the drum, and dust collectors—cyclone or bag filters—remove particles. Dried sludge is then conveyed for storage or reuse.
Supported heat sources for sludge drying
FTM Machinery, one of the experienced sludge dryer manufacturers, offers machines compatible with various heat sources. Our thermal dryers are energy-efficient and support different fuel types for better project flexibility.
Supported heat sources for sludge drying
Available fuels:
Solid fuel: coal, biomass pellets, rice husk, wood
Gas fuel: natural gas, biogas, coal gas, liquefied petroleum gas, waste heat gas, steam
Liquid fuel: diesel, heavy oil, bio-oil
Fuel selection tips: Use natural gas in cities with strict emissions. Biomass fits rural or agricultural areas. Steam is great for facilities with central heat supply.

Applicable sludge types:

Domestic sludge / municipal sludge/sewer sludge
Chemical plant sludge / paper mill sludge
River dredging sludge
Oily sludge / red mud
Paint sludge / firework sludge, etc.

Dried sludge is used as clean fuel, organic fertilizer, or eco-friendly building filler — turning waste into value while cutting disposal costs and protecting the environment.

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