Abstract: Process for compacting and removing liquid from liquid containing waste materials including the steps of feeding the waste materials into compaction chambers, simultaneously compressing and heating the waste materials inside the compaction chambers, and removing liquid from the waste materials during the steps of compressing and heating.

Abstract: A sludge dehydrating press includes a container in which sludge to be treated is filled, a press unit for pressing sludge filled in the container, one or more screen cases disposed at positions in the container where water can be extracted from the sludge in substantially all portions of the sludge pressed by the press unit. Each of the screen cases has a screen surface extending parallel to the direction of pressing by the press unit and has also a space into which water extracted from the sludge flows. By driving the press unit, sludge in the container is compressed and extracted water is caused to flow into the space in the screen cases and is drained to the outside of the dehydrating press.