Multidisc are arranged one after other with alternate disc being moving and fixed. The gap between the plates acts as media for fine filtration. The screw press main unit requires very very low power motor and the filtration surface area consists of a multiple discs which are self-cleaning, and generally do not clog,thus, the sludge press can be used continuously.The main unit of the sludge dewatering screw press is of multi-shaft design. Hence, when two or more main units are configured into one machine, any individual shaft can be repaired or serviced without interrupting operations.