The THERMO-SYSTEM active solar biosolids dryer from Parkson Corp. uses 95 percent solar energy and ambient air to remove water from biosolids, producing a dry Class A material that can fuel waste-to-energy plants, coal power plants, or cement kilns. The odorless, biologically stable and nearly pathogen-free end product also can be used as fertilizer or soil conditioner. The drying plant, which resembles a large greenhouse, has a louver-controlled fresh air inlet, sensors that monitor the climate inside and outside, a PLC that controls and monitors the drying process, speed-controlled ceiling fans for optimal airflow, and exhaust fans to maximize drying.
