Plenary Environment has constructed the facility using the proven Keppel Seghers HARD Pelletiser system. This is an Australian first technology that utilises on indirect, gas-powered heating to dry the biosolids, eliminating pathogens and forming stable pellets suitable for beneficial re-use.
Wet biosolids from the adjacent Black Rock water reclamation plant are pumped via pipeline to the drying facility. The drying process begins by mixing wet biosolids with dry biosolids pellets. This helps the wet biosolids form into new pellets. The mixed biosolids are then raked across the heated plates, drying and forming into biosolids pellets. As the pellets reach the edge of a plate, they fall to a plate below, where the process continues.
Water vapour produced in the dryer is condensed back to water in the condenser, which uses recycled water as the cooling medium. All of this water is returned to the Black Rock Water Reclamation Plant.
When the pellets reach the bottom of the pelletiser, a conveyor belt is used to load them into a separation hopper. At this point, some of the smaller pellets are returned to the start of the process to be mixed with wet biosolids entering the facility.
The biosolids pellets are fed into an air cooler. Once cooled, the pellets are moved by an enclosed conveyor belt to a storage silo. From here, they are loaded into trucks and transported off site to be used on broad-acre farms.
Comprehensive treatment of all emissions to EPA and contractual requirements means this fully enclosed process does not produce any odours at the Black Rock Water Reclamation Plant boundary or any visible emissions.