Settling velocity of Cryptosporidium parvum and Giardia lamblia

Water Research
X Dai, J Boll

Abstract

Understanding transport behavior of Cryptosporidium parvum oocysts and Giardia lamblia cysts (together referred to as (oo)cysts) in overland flow is important for beneficial uses of receiving water bodies. Like sediment, (oo)cysts are subjected to deposition once they are present in overland flow or low flow environments like reservoirs, wetlands and sedimentation basins. The objectives of this paper are to present the theory and experiment to determine the free settling velocity (v(s)) of (oo)cysts and to compare experimental settling velocities to estimates using Stokes' law. A settling experiment was designed to quantify the v(s) of (oo)cysts in an aqueous column. C. parvum oocysts used were spherical with average diameter (+/-1SD) of 6.6+/-1.1 microm. G. lamblia cysts were oval shaped (average eccentricity = 1.48+/-0.19) with average size of 11.8 +/-1.3 microm. Average densities were 1009 kg m(-3) for C. parvum oocysts and 1013 kg m(-3) for G. lamblia cysts. Observed experimental settling velocities are 0.27 microm s(-1) and 0.67 microm s(-1) for C. parvum and G. lamblia, respectively. Estimated average settling velocities using Stokes' law were 0.36 microm s(-1) for C. parvum and 0.84 microm s(-1) for G. lamblia. R-squared...Continue Reading

References

Jan 1, 1997·Emerging Infectious Diseases·R L Guerrant
Feb 5, 2005·Applied and Environmental Microbiology·Kristin E SearcyThomas Harter
May 12, 2005·Environmental Science & Technology·Pamela L Young, Simeon J Komisar

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Citations

May 5, 2009·Applied and Environmental Microbiology·Thaddeus K GraczykHui-Wen A Cheng
Jan 6, 2011·Microbial Ecology·Roberto ReinosoEloy Bécares
Aug 29, 2013·Environmental Engineering Science·Justin T JasperKara L Nelson
Apr 4, 2009·Parasitology Research·Thaddeus K GraczykAlexandre J Dasilva
Aug 8, 2008·The Science of the Total Environment·José Antonio Castro-HermidaMercedes Mezo
Sep 24, 2015·The Science of the Total Environment·Shubiao WuRenjie Dong
Jul 10, 2007·Water Research·Eric CaronMichèle Prévost
Aug 31, 2016·Environmental Technology·Priscila Ribeiro Dos Santos, Luiz Antonio Daniel
Dec 14, 2011·Applied and Environmental Microbiology·Aurélien DumètreIsabelle Villena
Oct 3, 2018·Journal of Environmental Quality·Kerry A HamiltonWarish Ahmed

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