Palavras-chave
Cisto de giárdia
Água de Nascente
Água da torneira
H2O2/O3, O3
Como Citar
Dados de financiamento
-
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
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Fundação de Amparo à Pesquisa do Estado de São Paulo
Números do Financiamento 2017/12157-2 -
Fundação de Amparo à Pesquisa do Estado de São Paulo
Números do Financiamento 2012/50522-0
Resumo
Este estudo teve como objetivo investigar a eficiência do ozônio e do peroxônio na desinfecção de águas contendo cistos de Giardia duodenalis. Amostras de água de torneira (TW) e água de nascente (SW) sem cloro foram inoculadas com uma suspensão comercial purificada contendo 105 cistos de Giardia duodenalis. O método de filtração por membrana foi empregado para concentração de cistos, com eficiências médias de recuperação de 43,3% em TW e 73,3% em SW. A visualização dos cistos foi realizada por Ensaio de Imunofluorescência (IFI). O uso do ozônio como desinfetante em RS mostrou um aumento dependente da concentração no dano ao cisto, atingindo 98% de inviabilidade na maior concentração de ozônio (5 mg L-1). A adição de peróxido de hidrogênio (H2O2) melhorou o processo, pois 2,5 mg L-1 de ozônio na relação H2O2/O3 de 0,3 causou danos morfológicos em 99% dos cistos. Os dados indicaram que a menor relação H2O2/O3 resultou em melhor desempenho geral em termos de danos ao cisto. No TW, o comportamento de oxidação diferiu, sem diferença clara observada entre as concentrações mais baixas e mais altas de ozônio causando danos à parede do cisto. A presença de alcalinidade no TW afetou negativamente o processo de desinfecção, provavelmente devido ao efeito eliminador dos compostos de alcalinidade sobre os radicais hidroxila. O uso do processo peroxônio com relação H2O2/O3 de 0,5 proporcionou os maiores danos aos cistos no TW. As descobertas contribuem para a compreensão dos fatores que influenciam a eficácia das técnicas de oxidação e fornecem insights para o desenvolvimento de estratégias eficazes de desinfecção para sistemas de tratamento de água.
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Este trabalho está licenciado sob uma licença Creative Commons Attribution 4.0 International License.
Copyright (c) 2024 Gabriela dos Reis, Liane Yuri Kondo Nakada, Lays Paulino Leonel, José Roberto Guimarães
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