Sludge drying and thermal sludge utilisation plant Tobl
Sludge drying (TRA)
The dewatered sewage sludge from our wastewater treatment plant [2] and from a further 13 wastewater treatment plants [1] is processed into dry granulate by the belt dryer [5]. While the dewatered sewage sludge still contains approx. 72 - 82% water, the dry granulate still contains approx. 4 - 5% water. We process 40 containers (á 12.5 tons) per week, of which 8 - 10 containers of dry granulate remain after drying. The weight reduction is approx. 75 - 80%. The dewatered sewage sludge is conveyed via screw conveyors to the dryer, where it is evenly distributed on a belt. Hot air (approx. 140°C), which is heated by the heat of the thermal recycling plant, is led to the belt via fans and the water in the dewatered sludge is evaporated.
