High frequency excitation and vibration studies on hyperfiltration membranes

In an effort to increase the freshwater production rate, possible effects of high-frequency vibrations (both acoustically and electrically induced) on the hyperfiltration (reverse osmosis) process have been reexamined comprehensively. Cellulose-acetate membranes were used, both as customarily prepar...

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Published in:Desalination 1982-01, Vol.42 (3), p.329-338
Main Author: Herrmann, Cal.C.
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Language:English
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Marine
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description In an effort to increase the freshwater production rate, possible effects of high-frequency vibrations (both acoustically and electrically induced) on the hyperfiltration (reverse osmosis) process have been reexamined comprehensively. Cellulose-acetate membranes were used, both as customarily prepared by the Loeb-Sourirajan process, and with added magnetic and non-magnetic iron oxide powders. Flow and salt rejection were measured with sodium chloride feeds, without and with iron hydroxide or calcium sulfate membrane fouling. Flow and rejection were found substantially independent of the applied vibrations over the frequency and power ranges applied. The one exception was ultrasonic vibration on a depressurized, fouled membrane, which showed an advantageous cleaning effect (hyperfiltrate flux increased after the treatment), confirming previous observations.
doi_str_mv 10.1016/0011-9164(82)80008-8
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subjects Marine
title High frequency excitation and vibration studies on hyperfiltration membranes
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