Kubota Corporation

Tatsuya Uejima

Kiyoshi Izumi

Yasunobu Okajima

Kimihiro Ishikawa

Yoshio Matsuzaki

Tomohiko Sasaki

Masaaki Nagano

Yutaka Yamada

Taichi Uesaka

Hidetoshi Masutani

Kazuhisa Nishimori

Shigeto Miuma

A submerged membrane separator includes: a plurality of membrane cartridges arranged at predetermined spaces; a flow generating device for generating flows in one direction along the membrane surfaces of the membrane cartridges; and wall members on both sides of a channel of the flow in the one direction formed between the membrane cartridges adjacent to each other. The membrane cartridges can be attached and detached from another direction substantially orthogonal to the flows in the one direction and substantially orthogonal to the arrangement direction of the membrane cartridges.

Submerged membrane separator and membrane cartridge

A submerged membrane separatorincludes: a casingopened at the top; a plurality of flat membrane cartridgesarrayed at intervals in the casing; and an air diffuserprovided below the membrane cartridges. The membrane cartridgesare movably held in the up-down direction in the casingwhile having a space &#x3b1; in the up-down direction. Lifting suppressing membersandfor restricting a lifting amount of the membrane cartridgesduring filtration operation to be smaller than the space &#x3b1; in the up-down direction are provided in the casing

Submerged membrane separator

Disclosed is a membrane cartridge used in a submerged membrane separator. A peripheral portion of a filtration membrane is joined to the surface of a filtration plate. A portion higher than the surface of the filtration plate corresponding to the peripheral edge of the filtration membrane is formed on the surface of the filtration plate further on the outer side than the peripheral edge of the filtration membrane.

Membrane cartridge

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.

Water treatment system

An air diffuser () having a diffuser tube () immersed sidewardly in a tank (), a flushing pipe () opening at its tip an outlet () at an upper position of the diffuser tube, and a flushing valve () disposed in the flushing pipe (). The diffuser tube () is made up of a main pipe () communicated at its basal end to an air supply source () and communicated at its tip to the flushing pipe (), and a plurality of branch pipes () being communicated to the main pipe () and opening at their tip as a blowhole () at a lower position of the main pipe (). During air diffusion, air is supplied from the air supply source () with tile flushing valve () closed, and the air is diffused from the blowholes (). During flushing, air is supplied from the air supply source () with the flushing valve () opened and an intra-tank mixed liquor is sucked from the openings of the diffuser tube (), thereby flushing the inside of the diffuser tube () with the sucked intra-tank mixed liquor. The intra-tank mixed liquor is then joined with air to come off together from the outlet () of the flushing pipe (). Air diffusion from the blowholes () and the flushing of the diffuser tube () are alternately repeated by utilizing pulsation to be caused by pressure variations in the diffuser tube ().

Air diffuser and flushing method thereof

A multistage immersion type membrane separator in which an air diffuser is disposed under a filtration part immersed in a treatment tank, characterized in that: the filtration part has plural plate-like membrane cartridges arranged in a vertically parallel multistage fashion at spaced intervals for forming a crossflow passage of a predetermined width; and that the air diffuser has a diffuser tube disposed sidewardly that is communicated at its basal end to an air supply source and has at its lower side part plural blowholes, a flushing pipe that is communicated at its basal end to the tip of the diffuser tube and has at its tip an opening serving as an outlet above the diffuser tube, and a flushing valve disposed in the flushing pipe.

Multistage immersion type membrane separator and high-concentration wastewater treatment facility using same

Provided is a submerged membrane cartridge which comprises a supporting plate made of a resin, and a membrane disposed so as to cover the surface of the supporting plate, and is characterized in that the membrane is fused in a plurality of welding allowances formed in multiple, along the entire periphery of the supporting plate; an inner fixing portion that retains the membrane under tension is formed by an inner welding allowance; a water sealing portion that ensures a sealing function through the entire periphery of the membrane is formed by a central welding allowance; and an outer fixing portion that fixes the periphery of the membrane to the supporting plate is formed by an outer welding allowance.

Growing community of inventors

Amagasaki, Japan

Tatsuya Uejima