Patent ID: 7972510

Claim:
A sucking filtration apparatus of an immersion type or a filtration apparatus of an external pressure type for performing solid-liquid separation by immersing a plurality of hollow fiber membranes in a to-be-treated liquid containing a suspended component so that a treated liquid permeates said hollow fiber membranes, comprising: said hollow fiber membranes folded double; a treated liquid collection means communicated with an open end, of each of said hollow fiber membranes, which is disposed opposite to a bent side of each of said hollow fiber membranes; a holding member for holding a bent portion of each of said hollow fiber membranes with a gap formed between said bent portion of each of said hollow fiber membranes and said holding member; and a gas-jetting means for jetting a cleaning gas from said bent side of each of said hollow fiber membranes to a side of said open end of each of said hollow fiber membranes, wherein a gap for flowing said gas jetted by said gas-jetting means is formed between said hollow fiber membranes held by said holding member and said holding member or/and in at least one part of gaps between said hollow fiber membranes, and wherein said holding member consists of a plate disposed in a direction orthogonal to said axial direction of said hollow fiber membranes; and said plate has a plurality of a pair of through-holes proximately formed for one or a plurality of said hollow fiber membranes with adjacent pairs of said through-holes spaced at a predetermined interval; and both sides of said bent portion of one or a plurality of said hollow fiber membranes are inserted through a pair of said through-holes with a gap provided between said both sides of each of said hollow fiber membranes.