Biodrying Systems

For Reducing Mass, Volume, and Hauling Costs of Municipal Biosolids.

Biodrying is the process by which biodegradable waste is rapidly heated through initial stages of composting to remove moisture from a waste stream and hence reduce its overall weight. In the biodrying process, the drying rates are increased by biological heat in addition to forced aeration (Choi HL,2001).

BDP biodrying systems combine agitation and aeration inside an enclosed facility to create optimal biodrying conditions when compared to static type systems. This process requires little to no amendment. A BDP Biodrying facility can often be a valuable option compared to traditional biosolids thermal dryers with significantly less energy consumption.


  • Enclosed – For prevention of odor emissions and to minimize weather impacts
  • Agitated – To Maintain: pile porosity, end product consistency
  • Aerated – To Maintain: Aerobic conditions, control pile temperature

Recent Improvements:

  • Fully automated facility ability
  • Touch screen panels on compost agitator/dolly
  • Radio Communication/control ability to offsite locations as desired

Biodrying Case Studies

In-vessel composting facility seen from outside

Tianjin Biosolids & Agricultural Byproducts

Commencing operations in 2012, the Tianjin compost facility has the distinction of being the first facility to combine BDP’s agitated bay technology with BacTee’s negative aeration system for the bays.

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