Multi-Disk Screw Press(Hereinafter referred to as MDS) belongs to the screw press, its clog-free feature and can reduce the sedimentation tank and the sludge thickening tank, saving the investment costs of sewage treatment plant construction and water consumption. The main units of MDS are the Screw and Fixed Rings and Moving Rings. Mobilized by the screw, it continuously cleans the sludge out of the gaps, therefore, preventing clogging. MDS also can operate automatically controlled by the PLC for 24 hours,unmanned. It's a new technology that can replace the traditional filter press like belt press and frame press, the screw speed is very low, so it costs low power and water consumption in contrast to the centrifuge, it is a cutting edge sludge dewatering machine.