Biosolids Dryer
What Is Biosolids Drying? Complete Guide to Sludge Drying Systems
Biosolids drying is the process of removing water from wastewater sludge using heat, transforming wet sludge into a dry, stable, and manageable material.
After mechanical dewatering, sludge still contains significant moisture — often 65–80% water. A biosolids dryer reduces this to as low as 10–20% moisture, dramatically improving handling, transport, and reuse potential.
This process is widely used in municipal and industrial wastewater treatment to reduce disposal costs, improve safety, and produce a usable end product.
Why Drying is the Final Step
Why Drying is the Final Step
Why Drying is the Final Step
One of the biggest mistakes in wastewater design is stopping at dewatering.
Dewatered sludge:
- Still heavy
- Still expensive to dispose
- Still biologically active
Drying is what transforms sludge into a finished product.
A properly designed system should follow:
Equalization → Chemical Treatment → Clarification → Filter Press → Biosolids Dryer
At Met-Chem, we design systems that integrate filtration and drying to produce maximum solids and minimum waste volume.
How Dry Can Biosolids Get?
Why Drying is the Final Step
Why Drying is the Final Step
Dryness levels vary depending on system design:
- Partially dried: ~30–70% solids
- Fully dried: 80–90% solids
- Advanced systems: up to 90%+ solids
Some dryers can produce pelletized biosolids suitable for reuse or sale