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Type: Artigo de periódico
Title: Comparison of two methodologies for detection of Giardia spp. cysts and Cryptosporidium spp. oocysts in activated sludge samples from a sewage treatment plant in the city of Campinas, Sao Paulo State, Brazil
Author: Bonatti, TR
Franco, RMB
Neto, RC
Abstract: Giardia spp. and Cryptosporidium spp. are recognized worldwide as highly infectious protozoan parasites that can cause severe gastrointestinal disease in humans and animals. The detection of these pathogens in activated sludge samples becomes interesting since there is an increasing trend for the use of sewage sludge (biosolids) in agriculture. A total of 22 samples were collected and evaluated by means of Centrifugal - Concentration, followed or not followed by a purification process (ether clarification and sucrose flotation). Student t tests for comparison of the two procedures indicated a higher recovery rate of Giardia cysts with Centrifugal - Concentration; with regard to Cryptosporidium oocysts, no significant differences were found between the two methods, as only two samples were positive. The Centrifugal - Concentration procedure was shown to be the simplest and cheapest to perform, as emphasized by the efficiency recovery results.
Subject: centrifugal - concentration
sewage sludge
Country: Inglaterra
Editor: I W A Publishing
Citation: Journal Of Water And Health. I W A Publishing, v. 5, n. 4, n. 609, n. 614, 2007.
Rights: fechado
Identifier DOI: 10.2166/wh.2007.006
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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