Liquid purification or separation – Processes – Separating
Reexamination Certificate
2005-04-12
2005-04-12
Kim, John (Department: 1723)
Liquid purification or separation
Processes
Separating
C210S106000, C210S108000, C210S194000, C210S252000, C210S258000, C210S321690, C210S321740, C210S321830, C210S411000, C210S636000, C210S650000, C210S791000, C210S797000, C210S805000
Reexamination Certificate
active
06878294
ABSTRACT:
A spiral wound membrane element allowing back wash reverse filtration at 0.05 MPa to 0.3 MPa is employed for a spiral wound membrane module. Air injection of injecting air of not more than 0.3 MPa into a permeate outlet of the spiral wound membrane module from a pressurized air feeder through a pipe, back wash reverse filtration with permeate and flushing with raw water are performed as recovery of a filtration velocity. Another spiral wound membrane module comprises a spiral wound membrane element including a separation membrane having high back pressure strength. Raw water into which bubbles are diffused by an air diffuser is fed to the spiral wound membrane element stored in a pressure vessel. Part of the raw water is axially fed through the spiral wound membrane element, discharged from a raw water outlet of the pressure vessel and thereafter returned to a raw water tank through a pipe.
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Ando Masaaki
Ishihara Satoru
Ishii Katsumi
Akin Gump Strauss Hauer & Feld & LLP
Kim John
Nitto Denko Corporation
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