To provide a membrane module having a structure preventing such a defect that a dead space becomes easy to generate by the increase in flowing resistance in a radial direction accompanied by an increase in the diameter of a module and suppressing a drift even in water treatment wherein a high recovery ratio is required by changing the density of hollow-fiber membrane bundles to generate a uniform flow over the range from a supply part to a cone. waste water discharge port, excellent in the stability of long-term continuous operation and washing properties.
A hollow-fiber membrane module is partially changed in membrane density so as to promote a flow in a radial direction by continuously reducing the density of hollow-fiber membranes of the dead space part of the membrane moule over the range from the center of the cross section of a hollow-fiber membrane bundle group to the outer peripheral part thereof in a radial direction.
| WO/2023/182636 | FLUID RECOVERY SYSTEM AND FLUID RECOVERY METHOD USING SAME |
| WO/2020/023777 | PIPING MANIFOLD FOR PULSATING FLOW |
KUMANO ATSUO
MATSUI YOICHI
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