Desempenho da filtração lenta em areia submetida a cargas de pico de oocistos de Cryptosporidium sp, bactérias e sólidos: uma avaliação em instalação piloto

Heller, Léo; Vieira, Maria Berenice Cardoso Martins; Brito, Ludmila Ladeira Alves de; Salvador, Daniella Pedrosa

doi:10.1590/s1413-41522006000100005

Cited by 6 publications

(5 citation statements)

References 17 publications

(9 reference statements)

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“…In addition, seasonal monitoring aims to characterize the aquatic environment, since bacteria in the coliform group are not good indicators of the prevalence of protozoa (HORMAN et al, 2004) and due to the underestimation of risk of infection caused by punctual samples (HELLER et al, 2006), as performed in the present study.…”

Section: Resultsmentioning

confidence: 99%

Detection of Cryptosporidium spp. oocysts and Giardia spp. cysts in surface water destined for public supply in the state of Goiás, Brazil

Silva

Scalize

2020

Eng. Sanit. Ambient.

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The protozoa Cryptosporidium spp. and Giardia spp. are etiological agents responsible for the transmission of gastroenteritis, mainly due to the consumption of contaminated water. Their (oo)cysts are resistant to adverse environmental conditions, as well as to most conventional water treatment processes. Thus, the objective of this work was to evaluate the occurrence of (oo)cysts of these protozoans in surface water collected for human consumption in the state of Goiás, Brazil. Fifteen samples of raw water were collected to assess the occurrence of (oo)cysts of the protozoa using the Membrane Filtration method, in addition to turbidity and pH analyses. Recovery rates in tests with ultrapure water reached the USEPA (2012) criteria for Giardia (78.1% ± 0%) and for Cryptosporidium (60.6% ± 32.6%); however, recovery in raw water was lower due to turbidity. All samples (n = 15) were positive for Cryptosporidium spp. oocysts, with a maximum concentration of 250 oocysts/L, demonstrating that these protozoa are disseminated in the aquatic environment of the state of Goiás and pose a risk to public health. Due to the use of water sources for public consumption, it is recommended that public authorities and sanitation companies act to preserve and maintain water courses, carry out periodic monitoring of treatment plants that supply the Cerrado, Santana and São Manoel streams and improve existing treatment technologies. The results did not allow to infer whether animal load and grazing area promote an increase in contamination of the lotic aquatic systems.

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Section: Resultsmentioning

confidence: 99%

Detection of Cryptosporidium spp. oocysts and Giardia spp. cysts in surface water destined for public supply in the state of Goiás, Brazil

Silva

Scalize

2020

Eng. Sanit. Ambient.

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“…24,[30][31][32] In Brazil, several studies have reported Cryptosporidium oocysts in raw or treated sewage and bottled mineral water by using immunomagnetic separation or Percoll or sucrose gradients, followed by immunofluorescence, phase contrast microscopy, or epifluorescence. [13][14][15]33 Hachich and others 11 studied different hydrographic basins containing water for human consumption in the State of São Paulo by using the 1623 USEPA method. They reported prevalences of 2.5% for Cryptosporidium oocysts and 27% for Giardia cysts.…”

Section: Discussionmentioning

confidence: 99%

Genotypic Characterization of Cryptosporidium hominis from Water Samples in São Paulo, Brazil

Araújo¹,

Dropa²,

Fernandes³

et al. 2011

The American Society of Tropical Medicine and Hygiene

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The protozoan parasite Cryptosporidium has emerged as one of the most important water contaminants, causing waterborne outbreaks of diarrheal diseases worldwide. The small size of oocysts under the microscope and the possibility of changes in characteristics of oocysts, mainly in environmental samples, make the taxonomy of the genus difficult if morphologic characteristics are considered. This limitation encouraged the application of molecular methods to identify this microorganism. The aim of this study was to detect and identify by nested-polymerase chain reaction oocysts of Cryptosporidium present in water samples in the state of São Paulo, Brazil. Water samples were concentrated through a membrane filter, DNA was extracted by using a standard technique, and both amplification reactions used forward and reverse oligonucleotides that were complementary to Cryptosporidium 18S ribosomal RNA gene sequences. Thirty water samples from different sites of collection in the state of São Paulo were evaluated. Cryptosporidium oocysts were detected in 30% of the samples. By genoptyping, C. hominis and Cryptosporidium sp. were identified in recreational water and C. meleagridis was identified in surface water samples. This is the first report of C. hominis in environmental samples in Brazil. Although identification of Cryptosporidium is still a difficult task, molecular methods are essential for specific identification and are a helpful tool to aid to understand the epidemiology of this parasite in Brazil.

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“…Nos Estados Unidos, Europa e mesmo no Brasil, vários trabalhos apontam a capacidade da filtração lenta em remover protozoários, vírus, bactérias e turbidez (TIMMS et al, 1993apud. PROSAB, 2006DULLEMONT et al, 2006;HELLER et al 2006;SCHULER, GHOSH e GOPALAN, 1991;JENKINS, TIWARI e DARBY, 2011).…”

Section: Introdução E Objetivosunclassified

Avaliação Da Filtração Lenta Como Tratamento De Águas Com Baixa Turbidez E Presença De Algas E Cianobactérias: Aplicação À Água Do Lago Paranoá/Df

Teixeira¹,

Brandão²

2016

Anais Do XIV Encontro Nacional De Estudantes De Engenharia Ambiental

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Resumo: A crescente demanda por água tratada tem requerido a utilização de novos mananciais de água para o abastecimento humano, como em breve ocorrerá com o lago Paranoá. Entretanto para adequada definição da tecnologia de tratamento a ser adotada faz-se necessário o conhecimento das características limnológicas e do ecossistema aquático. A filtração lenta é uma alternativa tecnológica que tem se mostrado eficiente na remoção partículas sólidas, cianobactérias e vários patógenos. Neste contexto, o objetivo do presente trabalho é avaliar a adoção da filtração lenta, considerando mananciais com baixa turbidez e presença de microalgas e cianobactérias utilizando a água do lago Paranoá como estudo de caso. Para tal, foram realizados experimentos em filtros lentos de areia em escala piloto, em duplicada, operados com taxa de filtração de 2 e 5 m³.m -².dia -1 com água bruta do lago Paranoá. Os resultados obtidos corroboram o grande potencial da filtração lenta para remoção de turbidez (97%), clorofila-a (99%) e micro-organismos patogênicos, praticamente 100% de remoção de coliformes totais e E. coli. Palavras-chave:Filtração lenta com areia, Remoção de microalgas e cianobactéria, Lago Paranoá.

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Desempenho da filtração lenta em areia submetida a cargas de pico de oocistos de Cryptosporidium sp, bactérias e sólidos: uma avaliação em instalação piloto

Cited by 6 publications

References 17 publications

Detection of Cryptosporidium spp. oocysts and Giardia spp. cysts in surface water destined for public supply in the state of Goiás, Brazil

Detection of Cryptosporidium spp. oocysts and Giardia spp. cysts in surface water destined for public supply in the state of Goiás, Brazil

Genotypic Characterization of Cryptosporidium hominis from Water Samples in São Paulo, Brazil

Avaliação Da Filtração Lenta Como Tratamento De Águas Com Baixa Turbidez E Presença De Algas E Cianobactérias: Aplicação À Água Do Lago Paranoá/Df

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