A biosolids dryer is an advanced piece of wastewater treatment equipment used by municipalities to reduce the moisture content of sludge produced at wastewater treatment plants. After thickening and dewatering, municipal sludge still contains 65–80% water. A dryer lowers that moisture to 10–20%, producing a lighter, drier, and safer material that is easier and less expensive to handle, transport, and dispose of.

1. Dewatered Sludge Feed
   Sludge cake from a centrifuge, belt press, or filter press is delivered to the dryer.
    
2. Indirect Heat Transfer
   Heat is applied indirectly through the stainless steel trough walls. This is safer and more efficient than direct heat, which uses open flames. Heating media can include natural gas, steam, hot water, or electricity.
    
3. Mixing and Drying
   Slow-turning paddles or agitators move the sludge through the trough, ensuring even heat distribution and preventing clumping. As the material heats, water evaporates.
    
4. Vapor Handling
   A dedicated air system captures and treats the evaporated water vapor, controlling odor and emissions to meet environmental standards.
    
5. Discharge
   The final dried material is discharged automatically as a granular or pelletized product with 10–20% moisture content.
    

• Volume & Weight Reduction – Cuts disposal and hauling costs by reducing sludge mass.
   
• Odor Control – Heat treatment minimizes offensive odors.
   
• Regulatory Compliance – Helps municipalities meet EPA 503 requirements for Class A or Class B biosolids.
   
• Pathogen Reduction – High drying temperatures kill bacteria and viruses.
   
• Energy Efficiency – Indirect heat design retains heat within the system, lowering utility costs.
   
• Flexibility – Dried biosolids can be landfilled, used as fertilizer/soil amendment, or repurposed as a renewable fuel.
   

Met-Chem has been designing and building wastewater treatment equipment since 1956. Our municipal biosolids dryers are built in the USA with durable stainless steel construction and feature:

• Multiple heating options (gas, steam, hot water, or electric).
   
• Batch drying for operator control over run times, dryness, and temperature.
   
• Energy-efficient design that keeps more heat in the system.
   
• Proven reliability in municipal wastewater treatment plants across the country.
   

By pairing a Met-Chem filter press with a Met-Chem biosolids dryer, municipalities gain maximum dewatering efficiency – from sludge cake to fully dried biosolids.

Municipalities face rising disposal costs, stricter environmental regulations, and growing demand for sustainable wastewater treatment solutions. A biosolids sludge dryer from Met-Chem provides the performance, safety, and cost savings needed to meet those challenges head-on.

Contact Met-Chem today to learn how our municipal biosolids dryers can reduce your sludge handling costs and turn waste into a valuable resource.

• Page Title: Municipal Biosolids Dryer | Met-Chem Biosolids Sludge Drying Equipment
   
• Meta Description: Met-Chem manufactures municipal biosolids dryers that reduce sludge moisture, lower disposal costs, and improve handling. Built in the USA for reliable wastewater treatment.
   
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