Each furnace is equipped with 2 feed screws that dose the solid waste from the feeding chute onto the fluidised bed. The sludge is pumped into the furnace in an even and controlled manner.
The incineration process takes place at a temperature of minimum 850 °C. At the bottom of the furnace there is a sand bed. Air nozzles blow air into the sand bed at high speed from below. This primary air thrusts the sand bed upwards into the oven, making it swirl like a fluid. The waste is introduced via two overhead openings directly into the hot sand. It mixes in with the sand and burns instantly. The sludge is fed into the furnace via the 4 side walls. Secondary air is blown into the furnace above the sand bed. This secondary air ensures optimum incineration.
Urea is injected directly into the furnace to achieve the necessary NOx emissions limit.
Screws remove the sand and bottom ash from the furnace. Once it has been sieved the sand fraction is recovered and subsequently brought back into the fluidised bed. A magnet separates the metals from the bottom ash.