Integrated environment-friendly mechanical deep drying system of dredged sediment

The utility model relates to an integrated environment-friendly mechanical deep drying system of dredged sediment. An inlet pipeline is communicated with a first-stage sedimentation unit by virtue of a grille unit, the first-stage sedimentation unit is communicated with a second-stage sedimentation unit by virtue of an overflow weir, the second-stage sedimentation unit is communicated with a first conditioning unit through an overflow weir, the first conditioning unit enters a third-stage sedimentation unit by virtue of a first chemical agent adding unit, upper-layer residual water inside the third-stage sedimentation unit is connected with a residual water purification unit by virtue of a water decanter, and slurry settled at the bottom is connected with a mechanical dehydration unit by virtue of a slurry pump arranged at the bottom of the third-stage sedimentation unit. By combining the actual situation of a dredging engineering and drying processes of dredged sediment at home and abroad, the system integra