Sludge dryer BioCo™

Drying sludge has several advantages, including: • Sanitization: sludge is dried at over 80°C during more than one hour, removing pathogenic germs (USEPA Class A); • Stabilization: biological activity in sludge is stopped by drying; • Tonnage reduction: water in sludge is almost completely removed which reduces sludge tonnage to 1/5 - 1/3; • Better sludge utilization: it can be used without causing problems, storage is easier, and spreading is feasible with conventional fertilizer spreading resources. Sludge is a high quality fuel which is suited to various combustion methods. Features & Benefits In addition to optimal drying, the BioCo™ technology brings other benefits. • Operational security and safety: >The drying air and sludge circulate in co-current, which limits fire risks. The drying air gets into the dryer at a maximum temperature of approximately 170°C, while the sludge enters at a temperature of approximately 20°C. >The BioCo™ dryer works without dried sludge recycling, preventing the formation of dust. This eliminates the fire risk related to its inflammation. > This highly automated system has sensors, detectors, alarms, stopping procedures and a sprinkler system. It is also characterized by its low belt speed. • BioCo™ works at relatively low temperature; between 170-120°C during the first drying step and between 100-80°C for the second. Several heating systems can be used to achieve these temperatures. • The drying plant is maintained in slight negative pressure by a centrifugal fan ensuring continuous extraction of a part of the drying air.