SOLIA™

Renewable Solar Energy Source

The automatic SOLIAMIX™ windrow turner is available in three sizes

Kruger has enhanced the efficiency of solar sludge drying by coupling two well-known processes: air drying and aerobic fermentation.

  • Using solar radiation and the action of an automated windrow turner (SOLIAMIX™), water evaporates from the sludge for subsequent removal from the greenhouse.
  • The SOLIAMIX™ windrow turner keeps the biosolids aerated and promotes digestion of the biosolids which produces heat to aid the drying process.

The automated SOLIAMIX™ system deposits the biosolids into windrows. In order to renew the drying surface area and promote aeration, the windrows are turned at regular intervals.

Triangular windrow shaping offers a larger exchange surface area than sludge drying beds for the same amount of greenhouse space, resulting in a faster drying process. Furthermore, a higher quantity of sludge can be stored.

The exothermal reactions occurring during the fermentation process generate a biosolidstemperature increase (50 to 60°C) to promote pathogen destruction.

Optimized Drying Via Ventilation and Circulation

The greenhouse is fitted with two types of air handling systems:

  • Circulation fans are used to provide a homogenous drying atmosphere in the greenhouse
  • Extraction fans are used to remove the moist air and further control the drying process

SOLIA™ Benefits

  • Optimized drying surface with sludge windrow layout
  • 60-80% reduction in biosolids quantity
  • Integrated biosolids storage within the SOLIA process
  • Operational flexibility
  • Optional odor control
  • End product traceability
  • Reduced operating costs

    • Top: Greenhouse solar drying principle

    Bottom: Typical pass of the SOLIAMIX™ windrow turner within the greenhouse

    For additional information on SOLIA, please contact Travis Smith at (919) 677-8310.