Rotary drum type solid-liquid separation apparatus

Abstract

A solid-liquid separation apparatus wherein a solid-liquid mixture is introduced into a rotary filtration drum having filter cloth mounted thereon and is allowed to pass through the filter cloth to thereby separate the solids contained therein. The filter cloth has one surface facing the interior of the drum and covered with a napped filter layer which is formed by a multiplicity of fibers having a diameter of 0.1 to 10 .mu.m. The filter cloth preferably has an elongation percentage of not smaller than 1.0%. A base material of the filter cloth includes a weft extending along the rotational axis of the drum and a warp extending in the circumferential direction of the drum. The fibers of the napped filter layer are formed by napping chiefly the weft in the direction of the warp. A first sprayer is arranged in a facing relation to the outer peripheral surface of the filter cloth, for flushing a collecting liquid to collect the solids arrested by the filter cloth, and a collecting hopper is arranged inside the drum, for collecting the solids washed off by the collecting liquid. A second sprayer is arranged in a facing relation to the inner peripheral surface of the filter cloth, for flushing a washing liquid to wash off the solids attached to the fibers of the napped filter layer. Further, a third sprayer is arranged outside the drum for washing the filter cloth with chemicals, and a baffle plate is arranged inside the filtration drum.