• JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
 
  Bookmark and Share
 
 
Doctoral Thesis
DOI
10.11606/T.22.2011.tde-08082011-154457
Document
Author
Full name
Karina Aparecida de Abreu Tonani
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
Ribeirão Preto, 2011
Supervisor
Committee
Muñoz, Susana Segura (President)
Ferreira, Beatriz Rossetti
Hachich, Elayse Maria
Razzolini, Maria Tereza Pepe
Watanabe, Evandro
Title in Portuguese
Bioagentes patogênicos em águas residuárias: destaque para giardia spp., cryptosporidium spp. bactérias indicadoras e vírus entéricos
Keywords in Portuguese
Águas residuárias
Bactérias
Cryptosporidium spp.
Giardia spp.
Parasitas
Virus
Abstract in Portuguese
Esgotos urbanos constituem compartimentos ambientais que favorecem a emergência e re-emergência enfermidades de veiculação hídrica. Este estudo objetivou analisar cistos de Giardia spp., oocistos de Cryptosporidium spp., assim como cistos, ovos e larvas de outros protozoários e helmintos patogênicos; Coliformes Totais e Termotolerantes, Rotavírus e Adenovírus em amostras de esgoto bruto e tratado da Estação de Tratamento de Esgoto de Ribeirão Preto - SP. As coletas de esgoto foram realizadas no ponto de entrada e no ponto de saída da ETE-Ribeirão Preto/SP. As análises de cistos de Giardia spp. e oocistos de Cryptosporidium spp. foram realizados pelo Método 1623 da EPA. Ovos, cistos e larvas de outros protozoários e helmintos foram analisados pelo Método de Sedimentação proposto pela CETESB (1989). A análise de coliformes totais e termotolerantes foi realizada pela Técnica de Tubos Múltiplos (Colilert®). A análise de vírus foi realizada através do Teste de Elisa com o KIT da RIDASCREEN® Enzimaimunoensaio. Os resultados obtidos revelaram que a concentração de Giardia spp. no esgoto bruto variou de 120 a 2200 cistos/L, já no esgoto tratado essa concentração variou de 0,45 a 3,5 cistos/L. Com relação aos oocistos de Cryptosporidium spp. a concentração no esgoto bruto variou de não detectável a 28,9 oocistos/L e no esgoto tratado as concentrações variaram de não detectável a 1,05 oocistos/L. O processo de lodos ativados na ETE-RP promoveu uma remoção parcial de parasitas, tais como: Endolimax nana, Entamoeba coli, Entamoeba hystolitica, Ancylostoma sp., Ascaris sp. Fasciola hepatica e Strongyloides stercoralis, cujo fator de redução variou entre 18,2 e 100%. Pode-se observar que houve diferença estatisticamente significante entre o número mais provável de coliformes totais e termotolerantes no esgoto bruto e esgoto tratado, mostrando uma redução na concentração desses organismos indicadores após o tratamento do esgoto na ETE-Ribeirão Preto/SP. Não houve correlação significativa entre as concentrações de coliformes totais e termotolerantes em relação à concentração de cistos de Giardia spp. e oocistos de Cryptosporidium spp.. A análise de vírus mostrou resposta positiva para Rotavirus e Adenovirus em todas as amostras analisadas (esgoto bruto e tratado), mostrando menor absorvância no esgoto tratado. Os resultados obtidos contribuem para a identificação e caracterização de microorganismos de veiculação hídrica no esgoto tratado na ETE-RP, fornecendo dados úteis para a definição de políticas públicas de saneamento, referentes ao controle da qualidade microbiológica do esgoto no país.
Title in English
Patogenics agents in wastewater: emphasis in Giardia spp., Cryptosporidium spp., indicator bacteria and enteric viruses
Keywords in English
Bacteria
Cryptosporidium spp.
Giardia spp.
Intestinal parasites
Sewage
Virus
Abstract in English
Sewage treatment is still precarious in many Brazilian cities, which has contributed to the emergence and re-emergence of waterborne diseases. This study analyzed Giardia spp. cysts and Cryptosporidium spp. oocysts, as well as cysts, eggs and larvae of other protozoa and helminthes. Also part of the study were total and thermotolerant coliforms, Rotavirus and Adenovirus in samples of raw and treated sewage of the Sewage Treatment Station (ETE) of Ribeirão Preto, SP, Brazil. Sewage samples were taken at the points of entry and exit of the ETE, Ribeirão Preto. Analyses of Giardia spp. cysts and Cryptosporidium spp. oocysts were performed through the EPA's method 1623. Eggs, cysts and larvae of other protozoa and helminthes were analyzed utilizing the method of sedimentation as proposed by CETESB (1989). Analyses of total and thermotolerant coliforms were performed using the Multiple Tube method (Colilert®). Viral analyses were performed through the RIDASCREEN® enzyme immunoassay ELISA test kit. The results revealed that the concentration of Giardia spp. in raw sewage varied from 120 to 2,200 cysts/L; this concentration varied from 0.45 to 3.5 cysts/L in treated sewage. The concentration of Cryptosporidium spp. oocysts in raw sewage varied from non-detectable to 28.9 oocysts/L and from non-detectable to 1.05 oocysts/L in treated sewage. The activated sludge process used in ETE promoted a partial removal of parasites such as: Endolimax nana, Entamoeba coli, Entamoeba hystolitica, Ancylostoma sp., Ascaris sp. Fasciola hepatica and Strongyloides stercoralis. Reduction factors varied from 18.2 to 100%. A statistically significant difference was observed between the most probable number of total and thermotolerant coliforms in raw and treated sewage, showing a reduction in the concentration of these indicators after the treatment of sewage in ETE, Ribeirão Preto. No statistically significant correlation was found between the concentrations of total and thermotolerant coliforms in relation to the concentration of Giardia cysts spp. and Cryptosporidium spp. oocysts. Analyzing viruses showed positive responses for Rotavirus and Adenovirus in all the studied samples (raw and treated sewage), with a smaller absorbance in the treated sewage. The results contribute to the identification and evaluation of the prevalence of waterborne microorganisms in treated sewage in ETE, Ribeirão Preto, providing useful data for the definition of public policies for sanitation concerning microbiological quality control in Brazil's sewage.
 
WARNING - Viewing this document is conditioned on your acceptance of the following terms of use:
This document is only for private use for research and teaching activities. Reproduction for commercial use is forbidden. This rights cover the whole data about this document as well as its contents. Any uses or copies of this document in whole or in part must include the author's name.
Publishing Date
2011-08-16
 
WARNING: Learn what derived works are clicking here.
All rights of the thesis/dissertation are from the authors
Centro de Informática de São Carlos
Digital Library of Theses and Dissertations of USP. Copyright © 2001-2021. All rights reserved.