Ultrasonic cleaning of latex particle fouled membranes
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The Ohio State University / OhioLINK
2005
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=osu1103509383 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-osu11035093832021-08-03T05:49:29Z Ultrasonic cleaning of latex particle fouled membranes Lamminen, Mikko O. ultrasound membranes transducer fouling ultrasonic cleaning 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. 2005-01-06 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1103509383 http://rave.ohiolink.edu/etdc/view?acc_num=osu1103509383 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
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NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
ultrasound membranes transducer fouling ultrasonic cleaning |
| spellingShingle |
ultrasound membranes transducer fouling ultrasonic cleaning Lamminen, Mikko O. Ultrasonic cleaning of latex particle fouled membranes |
| author |
Lamminen, Mikko O. |
| author_facet |
Lamminen, Mikko O. |
| author_sort |
Lamminen, Mikko O. |
| title |
Ultrasonic cleaning of latex particle fouled membranes |
| title_short |
Ultrasonic cleaning of latex particle fouled membranes |
| title_full |
Ultrasonic cleaning of latex particle fouled membranes |
| title_fullStr |
Ultrasonic cleaning of latex particle fouled membranes |
| title_full_unstemmed |
Ultrasonic cleaning of latex particle fouled membranes |
| title_sort |
ultrasonic cleaning of latex particle fouled membranes |
| publisher |
The Ohio State University / OhioLINK |
| publishDate |
2005 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=osu1103509383 |
| work_keys_str_mv |
AT lamminenmikkoo ultrasoniccleaningoflatexparticlefouledmembranes |
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