Sludge dehydrator equipped with main-axis screw conveyer section and non-axis screw conveyer section

A sludge dehydrator equipped with a main-axis screw conveyer section and a non-axis screw conveyer section, the sludge dehydrator comprising:

• a cylinder having holes or slits that allow water squeezed out of sludge to be discharged therethrough;
• and
• a sludge compressing means that is installed to extend along a central axis of the cylinder and receives driving force from a driving source, thereby transporting and compressing sludge to dehydrate the sludge and allow water squeezed out of the sludge to be discharged through the holes or slits,
• wherein the compressing means includes:
• a first shaft that extends along the central axis of the cylinder;
• a second shaft that surrounds a portion of a length of the first shaft, is disposed on a side from which dehydrated sludge is discharged, and is rotatably combined with the first shaft;
• and
• a screw conveyer that is integrated with a circumferential surface of the first shaft and which is installed to rotate along a circumferential surface of the second shaft to dehydrate sludge by transporting and compressing the sludge through rotational motion thereof.