The mechanical dewatering of sludge is mainly to remove the capillary water between the sludge particles.
The mechanical dehydration of sludge dryer mainly includes belt filter press, plate and frame filter press and decanter centrifuge. When sludge is landfilled, sludge dehydration can greatly reduce the accumulation site of sludge and save the occurrence of sludge during transportation. cost of. When the sludge is composted, sludge dewatering can ensure the smooth progress of composting (the sludge generally requires a low water fastness during the composting process); if the sludge is incinerated, the high sludge dewatering rate can greatly reduce the heat energy consumption.
In the process of use, the downstream drying method is mainly used. The wet material in the equipment and the flue gas enter the equipment on the same side, so that the sludge dryer can effectively use its high temperature flue gas to obtain high evaporation intensity. The lower the outlet temperature, the higher the thermal efficiency.
However, the sludge composition is complex, the relative density is small, the particles are fine, and the sludge is often in a colloidal state, which determines the characteristics of its not easy dehydration. .
