| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an immersion type membrane separator provided with a micro bubble diffusing pipe capable of generating uniformly diffusion air even at a fixed length or more, and usable by air supply from only one side. <P>SOLUTION: This immersion type membrane separator is arranged with an immersion type separation membrane in an biological treatment vessel for activated-sludge-treating raw water, is arranged with a micro bubble diffusing device in an under side of the immersion type separation membrane, to carry out aeration continuously, and is thereby constituted to separation-filtrate, in an inside of the biological treatment vessel, a treated mixture liquid containing an activated sludge in the biological treatment vessel, by the immersion type separation membrane. The micro bubble diffusing device comprises the micro bubble diffusing pipe constituted of the center pipe, and an elastic sheet covering the center pipe and formed with a large number of slits opened and closed by extension thereof, and the immersion type membrane separator is constituted to satisfy at least one of (a) the condition where the slit in the vicinity of longitudinal-directional central part of the elastic sheet of the micro bubble diffusing pipe has the slit smaller compared with those in the vicinity of longitudinal-directional both ends, and (b) the condition where the slit in the longitudinal-directional central part of the elastic sheet is sealed in the micro bubble diffusing pipe. <P>COPYRIGHT: (C)2012,JPO&INPIT |
