Thermal destruction of sludge
Landfill or agricultural use of wastewater sludge is not always a feasible solution. The better the wastewater treatment process, the more noxious, or dirtier is the sludge. Incineration is a safe way of turning a problem waste into an opportunity.
Mechanically dewatered sludge cannot be incinerated auto thermally, i.e. reaching a temperature above 850°C without the use of auxiliary fuel. Auxiliary fuel is a big operational cost and thus is to be avoided. That is why it is necessary to increase the %DS before incineration.
The thermal destruction process of sludge consists of two steps:
- Sludge drying in order to increase the %DS.
- Sludge incineration of the pre-dried sludge.
Sludge drying is a heat consuming process, whereas sludge incineration produces heat. In integrated sludge treatment both processes are designed so that the heat required for drying (HYDROGONE® horizontal disc dryer and PUTTART® vertical drier granulator) is recovered from the heat released by the sludge incineration (HELIOSOLIDS® fluidized bed incinerator)
A wide range of separate or mixed injected sludge and waste streams can be incinerated with or without support fuel, depending on their heating value.
- Industrial sludge like oily sludge and slurry
- Spent grains from the brewing industry
- Acid oils
- Safe alternative for landfill
- Total elimination of sludge excess
- Energy recovery