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Ultrasonic cleaning of latex particle fouled membranes

Lamminen, Mikko O
http://rave.ohiolink.edu/etdc/view?acc_num=osu1103509383

Abstract Details

2005, Doctor of Philosophy, Ohio State University, Civil Engineering.
One of the drawbacks of membrane use is fouling which is a decrease in permeate flux with time. In this research, the ultrasonic cleaning of particle-fouled membranes was investigated. Specifically, the mechanisms responsible for ultrasonic cleaning, the solution conditions and cake layer effects on ultrasonic cleaning and the implementation of ultrasound into an existing membrane cell were evaluated. In initial studies, ceramic membranes were fouled by latex particles in a dead-end filtration cell and subsequently subjected to ultrasound in an external ultrasonic cleaning vessel. Results indicate that increased power intensity and lower frequency increase particle removal from a fouled membrane. These data along with SEM images suggest that cavitational mechanisms are important in detaching particles from the membrane surface while turbulence associated with ultrasound plays a role in the transport of particles away from the surface. In further studies the effect of pH, ionic strength and differing particle size on ultrasonic cleaning were investigated. Ultrasonic cleaning at high and low pH values was more effective than at neutral pH because of charge interactions of particles. Ultrasonic cleaning of fouling layers formed at higher ionic strength (> 0.3 M KCl) was less effective than cleaning at lower ionic strength (< 0.3 M KCl). Membrane cleaning experiments performed with particles of varying size showed that particle size was less important than the surface charge characteristics of the particles. This research has shown that particle surface charge is the most important factor affecting ultrasonic cleaning. Finally, a transducer system was developed for incorporation into a cross-flow cell. The external transducer system was able to clean the ceramic and polymeric membranes effectively. Pulse operation also cleaned membranes, although with slightly lower recovery than for continuous treatment. In the cross-flow cell, the transducer system was found to effectively clean the polymeric membranes. With operation at the highest voltages, some damage to the membrane was observed. The results of this research elucidate the mechanisms and important factors influencing ultrasonic cleaning of particle-fouled membranes. A new laboratory-scale transducer flat sheet membrane system was developed which serves as a prototype for the development of pilot scale systems.
Harold Walker (Advisor)
111 p.
ultrasound; membranes; transducer; fouling; ultrasonic cleaning

Recommended Citations

Citations

  • Lamminen, M. O. (2005). Ultrasonic cleaning of latex particle fouled membranes [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1103509383

    APA Style (7th edition)

  • Lamminen, Mikko. Ultrasonic cleaning of latex particle fouled membranes. 2005. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1103509383.

    MLA Style (8th edition)

  • Lamminen, Mikko. "Ultrasonic cleaning of latex particle fouled membranes." Doctoral dissertation, Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1103509383

    Chicago Manual of Style (17th edition)

osu1103509383
3,691
© 2004, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.