The pre-thickener performs the initial solid/liquid separation stage, taking sludge solids concentration from 0.5-3% up to 5-15%.
AThe dewatering in the press occurs firstly in the low pressure zone, then in the wedge zone and finally in the high pressure zone where the filter cake is compressed between the perforated cylinder cloth and the main cloth. The discharged sludge cake can reach dry solid contents variable from of 18 to 30% depending on the sewage sludge.
The belt press can be used for mixed fiber, biological, chemical sludge.