this sludge-dewatering unit consists of belt filter press model BELT and/or sludge dewatering Table model SG that is/are so called the machine.it requires preliminary flocculation to condition the sludge by using polymer , which are sold in powder or liquid form and stored as a relatively concentrated aqueous solution in preparation tanks. this solution is too viscous to be mixed the sludge and is further diluted just after the outlet of the dosing pump