Inactivation of Cryptosporidium and Giardia in Drinking Water by Ozone

Abstract:

The paper used the fluorescence staining method to study the effect of O₃ inactivating Cryptosporidium and Giardia in water. The results indicated that O₃ had the stronger inactivating ability. When the dosages of O₃ were above 3.0 mg /L and exposure time was 7 min, the extinct rate can be achieved 99.9%. The turbidity and concentration of organics were found to be statistically significant in artificial water. With the increasing of turbidity and temperature, the inactivating effect decreased. The inactivating ability of O₃ was stronger under acidic conditions than in alkalic circumstance. When the concentration of the organic in the reaction system is high, competition between Cryptosporidium, Giardia and organics with O₃ which reduced inactivation ratio might take place.

• Periodical: Applied Mechanics and Materials (Volumes 361-363)
• Pages: 623-627
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.361-363.623
• Online since: August 2013
• Authors: Zhi Lin Ran, Shao Feng Li
• Keywords: Cryptosporidium, Giardia, Inactivation, Ozone

References

[1] Graczyk TK, Lucy FE, Tamang L, Miraflor A, Human enteropathogen load in activated sewage sludge and corresponding sewage sludge-end products, Appl Environ Microbiol, vol. 73 pp.2013-2015, (2007).

DOI: 10.1128/aem.02412-06

[2] Xiao　L, Feng　Y, Zoonotic Cryptosporidiosis, FEMS Immunology Medical Microbiology, vol. 52, pp.309-323, (2008).

DOI: 10.1111/j.1574-695x.2008.00377.x

[3] Marion W J, Sangam T, Mario L, Charles M G, Identifying human and livestock sources of fecal contamination in Kenya with host-specific Bacteroidales assays, Water Research, vol. 43, pp.4956-4966, (2009).

DOI: 10.1016/j.watres.2009.07.028

[4] Melanie W, Paul S, Marcel T, Occurrence of Giardia lamblia in recreational streams in Basel-Landschaft, Switzerland, Environmental Research, vol. 109(5): pp.524-527, (2009).

DOI: 10.1016/j.envres.2009.02.012

[5] Céline M, Aurélien D, Sylvie G, Christelle G, Laurent M, Monitoring of Cryptosporidium and Giardia river contamination in Paris area, Water Research, vol. 43(1), pp.211-217, (2009).

DOI: 10.1016/j.watres.2008.10.024

[6] Pond K,. Water Recreation and Disease Plausibility of Associated Infections: Acute Effects, Sequelae and Mortality, World Health Organization, (2005).

DOI: 10.2166/9781780405827

[7] Ran Z L, et al, Effect of various factors on ozone inactivating Giardia in water, Chinese of Environmental Science, vol. 31(6): pp.51-55, (2010).

[8] Ruhangiz T K, Laila S, Purification of Cryptosporidium Oocysts and Sporozoites by Cesium Chloride and Percoll Gradients, The American Society of Tropical Medicine Hygiene, vol. 36(3), pp.505-508, (1987).

DOI: 10.4269/ajtmh.1987.36.505

[9] Campbell A T, Robertson L J, Smith H V,. Detection of oocysts of Cryptosporidium by enhanced chemiluminescence, Journal Microbiology Methods, vol. 17, pp.297-303, (1993).

DOI: 10.1016/0167-7012(93)90059-q

[10] Fernando M H, Elvira A M, et al, Disinfection of drinking water contaminated with Cryptosporidium parvum oocysts under natural sunlight and using the photocatalyst TiO2, Journal of Photochemistry and Photobiology B: Biology, vol . 88 p.105–111, (2007).

DOI: 10.1016/j.jphotobiol.2007.05.004