Water Supply Vol 2 No 3 pp 159–168 © IWA Publishing 2002
Depressed filtration ripening enhances removal of Cryptosporidium parvum
V. Gitis*, R.C. Haught**, R.M. Clark*** and E. Radha Krishnan****
*Department of Civil and Environmental Engineering, University of Cincinnati, Cincinnati OH 45221-0071, USA
**USA EPA, Office of Research and Development, NRMRL, Water Supply and Water Resources Division, 26 W. Martin Luther King Dr, Cincinnati OH 45268, USA
***USA EPA, Office of Research and Development, NRMRL, Water Supply and Water Resources Division, 26 W. Martin Luther King Dr, Cincinnati OH 45268, USA
****IT Corporation, 11499 Chester Road., Cincinnati OH 45246, USA
ABSTRACT
Pilot-scale experiments were conducted to investigate removal of Cryptosporidium parvum by contact granular filtration. The research demonstrated enhanced removal of Cryptosporidium parvum in the presence of kaolin particles. This is believed to be due electrostatic adhesion of Cryptosporidium parvum oocysts to the kaolin clay particles. The elementary physico-chemical interactions between filter granules and suspension particles will be discussed. This innovative concept was successfully implemented to reduce the ripening sequence of subsequent filtration experimental test runs by the addition of large surface area particles to slurry of kaolin and Cryptosporidium parvum in surface water.
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