FILTERING APPARATUS AND A METHOD OF FILTERING A LIQUID-SOLIDS SUSPENSION

摘要

A filtering apparatus including a thickener tank (1) having tubular filter units (5) suspended therein. A liquid-solids suspension is supplied to the tank (1) and an overflow pipe (9) is spaced in a filtrate compartment (3) above the filter units (5) for draining a filtrate liquid from the tank (1). Each filter unit (5) preferably includes a support screen (16), a filter cloth (18) mounted on the support screen (16), and an accumulator grating (20) over the filter cloth in which filter cake is accumulated. The method of the invention for filtering a liquid-solids suspension includes intermittently backwashing the filter units (5) to extrude filtercake from the accumulator grating (20).