Article ID Journal Published Year Pages File Type
1266016 Ultrasonics Sonochemistry 2006 9 Pages PDF
Abstract

Ultrasound at 20 kHz was applied to a cross-flow ultrafiltration system with γ-alumina membranes in the presence of colloidal silica particles to systematically investigate how ultrasonic factors affect membrane cleaning. Based on imaging of the ultrasonic cavitation region, optimal cleaning occurred when the membrane was outside but close to the cavitation region. Increasing the filtration pressure increased the compressive forces driving cavitation collapse and resulted in fewer cavitation bubbles absorbing and scattering sound waves and increasing sound wave penetration. However, an increased filtration pressure also resulted in greater permeation drag, and subsequently less improvement in permeate flux compared to low filtration pressure. Finally, pulsed ultrasound with short pulse intervals resulted in permeate flux improvement close to that of continuous sonication.

Related Topics
Physical Sciences and Engineering Chemistry Chemistry (General)
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