 · Thermal Heat Drying – An Andritz thermal heat dryer creates a Class AA biosolids material that can be beneficially reused.The final product is sold to area farmers and soil amendment mixing companies.Domestic Wastewater Biosolids (from FDEP)

"When domestic wastewater is treated, a solid by-product accumulates in the wastewater treatment plant and must be removed periodically to keep the plant operating properly.