Sludge dewatering system

A sludge dewatering system, comprising:

• a concentration apparatus that concentrates sludge while conveying the sludge on a top surface of a filter body;
• and
• a dewatering apparatus that subjects the sludge discharged from the concentration apparatus to pressure dewatering,
• wherein the concentration apparatus includes:
• a first chemical feeder that has an addition section provided on an upstream side of a filter cloth belt in a conveyance direction and the first chemical feeder is configured to add a first chemical agent to the sludge from the addition section,
• the filter cloth belt, which is provided as the filter body, is configured to subject the sludge in which the first chemical agent is added to gravity filtration while conveying the sludge on a top surface of the filter cloth belt in the conveyance direction;
• a second chemical feeder in which an addition section is provided above the filter cloth belt, the second chemical feeder is configured to add a second chemical agent to the sludge on the filter cloth belt from the addition section and the second chemical agent is a different flocculant from the first chemical agent;
• and
• a movement mechanism that is provided on the filter cloth belt at a downstream side of the second chemical feeder in the conveyance direction and extending in a direction intersecting the conveyance direction of the sludge by the filter body, the movement mechanism comprising a screw that has an outer diameter, which extends axially in the direction intersecting the conveyance direction of the sludge by the filter body, and the sludge is moved by rotation of the screw, and
• a guide plate for guiding the movement of the sludge by the screw, the guide plate comprising a wall portion and a bottom portion, the wall portion is stood up at a position that is a downstream side of the screw in the conveyance direction of the sludge by the filter body so as to be close to the screw, and the bottom portion comprises an edge that extends in an upstream direction such that the edge is positioned on the downstream side of the screw and is below the lowest point of the outer diameter of the screw, which increases a height of the sludge to consolidate the sludge in which the second chemical agent is added by moving the sludge by the rotation of the screw.