PROTECTIVE OUTER CYLINDER OF BUNDLED BODY OF HOLLOW YARN FILTER MEMBRANE

摘要

PURPOSE:To enhance backwashing capacity, in the protective outer cylinder of a bundled body of hollow yarn filter membrane, by a method wherein a gas outlet orifice is provided to a position higher than the lowermost end of a strip like material wound around the bundled part of the bundled membrane while the lower end of the outer cylinder is positioned below the lower end of the bundled membrane. CONSTITUTION:A bundled body of hollow yarn filter membrane is fixed to a protective outer cylinder 3 while one - several gas outlet orifices are provided to a position higher than the lowermost end 12 of a strip like material 13 wound around the bundled membrane. When a gas outlet orifice 10 is present at a position lower than the strip like material 13, such inconveniences are generated that a hollow yarn is accompanied by an exhaust gas jetting out of said orifice 10 or damaged during backwashing or the liquid level of a raw liquid part is made lower than the strip like body to interrupt the smooth backwashing of a part not immersed in a liquid.