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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Inactivation of Giardia duodenalis cysts by peroxidation and peroxidation assisted by ultraviolet radiation

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Author(s):
Jose Roberto Guimarães [1] ; Luciana Urbano dos Santos [2] ; Regina Maura Bueno Franco [3] ; Regiane Aparecida Guadagnini
Total Authors: 4
Affiliation:
[1] Faculdade de Engenharia Civil, Arquitetura e Urbanismo - Brasil
[2] Centro Universitário Padre Anchieta - Brasil
[3] Instituto de Biologia. Departamento de Biologia Animal - Brasil
Total Affiliations: 4
Document type: Journal article
Source: Engenharia Sanitária e Ambiental; v. 20, n. 2, p. 159-164, 2015-06-00.
Abstract

Performance of an advanced oxidative process (AOP) with the application of hydrogen peroxide and UV radiation (H2O2/UV) has proven effective to inactivate Giardia duodenalis cysts. Hydrogen peroxide concentrations of 15 mg.L-1 and 6x103 mg.L-1 and 44 UV doses of 2,736 and 5,472 mW s.cm-2 were used in this study. The process effectiveness was assessed observing the occurrence of damage to the cyst's wall using direct immunofluorescence reaction (IFA) and scanning electron microscopy (SEM). When using the lower UV radiation dose and the lower oxidant concentration the AOP has shown higher effectiveness both in causing damage to the Giardia duodenalis wall and in reducing the number of cysts inoculated at the beginning. The average reduction AOP and peroxidation processes reduced 45.2 and 22.6% in the number of G. duodenalis cysts and 42 and 29.4% of the remaining cysts presented damage, respectively. (AU)