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Solar Sludge Drying System

Parkson’s THERMO-SYSTEM® uses the sun as its main power source to generate 95% of the energy required for drying sludge. The result is significantly reduced operating costs compared to competing technologies like conventional gas or oil-fired dryers.

Our reliable solar sludge drying system is fully automated. A Programmable Logic Controller (PLC) carries a complex drying program that controls and monitors the entire drying process from start to finish, resulting in minimal operator attention or control. The system, which includes our sludge drying bed, is engineered to incorporate very few moving parts in order to maximize reliability and minimize maintenance costs.

The international award-winning Electric Mole® automatically turns, distributes and aerates the sludge to increase drying performance significantly. 

Parkson’s solar sludge drying system has been used in water and wastewater treatment plants ranging in size from 0.2 MGD to the world’s largest solar drying installation of 80 MGD.


  • Designed to accept liquid or de-watered sludge
  • Fully automated control
  • Minimal maintenance required
  • Easily loaded and unloaded with trucks, pumps or front-end loaders
  • Capable of utilizing waste heat to reduce the required drying area


  • Minimizes energy costs by using only 30-40 kWh per ton of water evaporated
  • Reduces sludge volume by up to 97%
  • Increases product dryness up to 90% dry solids
  • Produces Class A biosolids
  • Requires very little operator attention