Kubota Corporation

Hidetoshi Masutani

Yasunobu Okajima

Tomokazu Kitano

Tadao Shinkai

Yoshio Asakura

Tetsuya Uenaka

Youichirou Hirose

Kazuo Nanri

Kiyoshi Izumi

Tatsuya Uejima

Taichi Uesaka

Kazuhisa Nishimori

Shigeto Miuma

A membrane separation device is provided with membrane modules comprising multiple membrane elements, a frame body accommodating the membrane modules stacked in multiple stages, a stopper for closing an end portion of the frame body to prevent the membrane modules accommodated in the frame from being released, and elastic members which, arranged in a state of elastic deformation in the vertical direction in the frame with the end portion of the frame being closed, suppress vertical vibration of the membrane modules accommodated in the frame, whereby making it possible to avoid vibration of the membrane modules inside the frame body even if the volume of the membrane modules accommodated in the frame body varies.

Membrane separation device

A membrane separation device includes a plurality of membrane elements each having a separation membrane arranged on front and back sides of a flat filter plate, wherein the membrane elements are oriented vertically and arranged in an array separated by a fixed distance such that the separation membranes are facing one another. A narrowing member is provided outside of the membrane element arranged at the outermost position along the arrangement direction, the narrowing member being disposed at least in a vicinity of a bonding portion of the filter plate and the separation membrane along the vertical direction thereof so as to be separated from the outermost membrane element by a predetermined distance smaller than the fixed distance T, thereby avoiding rupture of the separation membrane provided on outer side of the outermost membrane element even if aeration is continued in a state in which the filtering operation is stopped.

Disclosed is a membrane separation device comprising a plurality of flat membrane elements () arranged in parallel to one another so as to form channels for a solution to be treated therebetween, and a collecting case () having a collecting space that is formed internally and communicates with filtrate flow channels of the membrane elements (). The collecting case () includes a membrane element holder () having a plurality of slits, into which the sides of respective membrane elements () are inserted, and a stopper () which abuts on the membrane element holder () in the collecting case (), and a filler () is provided in the slits to attach and watertightly seal between the membrane elements () and the membrane element holder ().

The wall member of a water collecting case forms a projecting portion projecting to the outer side and recessed portions recessed to the inner side.

Membrane separator and membrane cassette

A membrane element is provided between a pair of water collecting cases. Water collecting spaces in which permeate having penetrated through the membrane element is collected are formed in the water collecting cases. The water collecting case of one membrane module and the water collecting case of the other membrane module are coupled via coupling portions. The coupling portions have flow holes. The water collecting space of the water collecting case of the one membrane module and the water collecting space of the water collecting case of the other membrane module communicate with each other via the flow holes of the coupling portions.

Membrane module and membrane cassette

A membrane elementincludes filtration membraneson the flat part of the membrane element. Spacing memberskeep spacing S between the filtration membranesbetween the membrane elementswhen the membrane elementsare arranged with the filtration membranesopposed to each other. The spacing memberseach have spacer sectionsandthat keep the spacing S between the filtration membranesbetween the membrane elementsin the direction of a membrane surface cleaning stream that flows along the surface of the filtration membrane

Spacing member, membrane element, and submerged membrane separation device

Membrane module for membrane separation

Water collecting case for membrane module

Membrane cassette for membrane separation

A water treatment system having a biological treatment step (a secondary treatment step) and a membrane separation step (a tertiary treatment step), wherein a portion of the raw water to be treated and/or a portion of the primarily treated water in the pretreatment step are biologically treated and supplied into a reaction tank in the membrane separation step as the main channel system, while the remainder the raw water to be treated and/or the remainder of the primarily treated water in the pretreatment step are added together with a flocculating agent to the reaction tank in the membrane separation step, and then the membrane separation is conducted in the membrane separation step.

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Amagasaki, Japan

Hidetoshi Masutani