FILM DAMAGE DETECTOR AND METHOD OF DETECTING DAMAGE OF FILM

PROBLEM TO BE SOLVED: To provide a film damage detector which enables detecting fine damage flaws of widths of ≤0.2 mm with high precision and a method of detecting damage of a film. SOLUTION: The detecting method comprises adding an iron type coagulant to raw water 10 from a coagulant injection dev...

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Bibliographic Details
Main Authors TAMURA TSUGIO, TSUJIMOTO WATARU, MITANI KAZUYUKI, NIEKAWA HIROSHI
Format Patent
LanguageEnglish
Published 11.10.2007
Subjects
CHEMISTRY
METALLURGY
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
TRANSPORTING
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Summary:PROBLEM TO BE SOLVED: To provide a film damage detector which enables detecting fine damage flaws of widths of ≤0.2 mm with high precision and a method of detecting damage of a film. SOLUTION: The detecting method comprises adding an iron type coagulant to raw water 10 from a coagulant injection device 8 arranged in the raw water tank 2 so that the concentration of iron ion in the raw water 10 reaches 10-30 mg/L, generating nanobubbles of diameters of 0.01-1 μm in the raw water 10 by using a nanobubble generator 11, introducing the raw water 10 involving the nanobubbles into a membrane module 4 to filter through a filtration membrane 10 so as to remove target matter and detecting leakage of the nanobubbles into the filtrate having passed through the filtration membrane 7 by a nanobubble detector 12. COPYRIGHT: (C)2008,JPO&INPIT
Bibliography:Application Number: JP20060085898