Stress-Controlled Filtration with Compressible Particles
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 132, Issue 7
Abstract
This paper documents a novel filtration technology that incorporates low-stiffness filter matrix particles. The application of isotropic stresses leads to the compression of particles and ensuing pore throat size reductions in the filter matrix. The filtration capacity of the matrix is improved with increasing confinement because the retention of filtrate particles increases due to particulate plugging and bridging on the reduced pore throats. Conversely, relaxing the applied stresses renders system expansion, increased pore throat sizes, and enhanced flushing of entrapped particles from the filter. Experimental results indicate that this technology is most efficient in cases where particle retention occurs due to geometrical constraints (i.e., bridging); however, the system can also render filtration by surface deposition due to the net electrical attraction between the filtrate and filter. Experimental results are analyzed by considering particle-scale filtration mechanisms.
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Acknowledgments
This research project was sponsored by the National Science Foundation (award CMS-0511002) and the San Diego State University Research Foundation, whose support is greatly acknowledged. The writers are thankful to Dr. Carlos Santamarina for conceiving the idea of utilizing compressible particles for filtration control and acknowledge the helpful suggestions and comments offered by Roxana Smarandache and Fatih Buyuksonmez.NSF
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Information & Authors
Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 132 • Issue 7 • July 2006
Pages: 861 - 868
Copyright
© 2006 ASCE.
History
Received: Jul 20, 2005
Accepted: Dec 14, 2005
Published online: Jul 1, 2006
Published in print: Jul 2006
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