Avaliação da eficiência de um sistema de lagoas de estabilização de esgotos na remoção de ovos de helmintos: proposta para a determinação do percentual de recuperação de ovos de helmintos através do método de Schwartzbrod
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Data
1996-06
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Editor
Ruy de Souza Lino Junior
Resumo
This study verifíed the capacity of retention of helminths eggs in a system
composed by waste stabilization ponds, and for that purpose three methods were
tested and evaluated (EXTRABES, Leeds J and the A method, recommended by the
World Health Organization, described by Schwartzbrod (WHO, 1989). As no data were available on the retrieval of helminths eggs by the
Schwartzbrod method, a technique was proposed to determine this percentage. The
assays were carried out on samples with sedimentable solid volumes ranging from
1,0 ml to 20,0 ml with a retrieval rate of 18% and 3,3%, respectively. The number of
helminth eggs retrieved through this method was larger in samples with less
sedimentable solids. These results show that when carrying out a sewage
parasitological examination, the amount of solid sediments must be determined in
order to apply the correspondem recuperation rates to the values of solids found in
the original sample.
Comparing the obtained results, the Schwartzbrod method was 1,5 fold
more effícient in recuperating helminth eggs than the EXTRABES and 7,8 fold than
the Leeds I method.
The output of the fírst lake was not appropriate in relation with the removal
of helminth eggs in 16,6% of the samples for utilization in agriculture, according to
the World Health Organization patterns.
Ali the examined samples in the final output, presented a negative value. It
was concluded that for the period studied, in terms of parasitological criteria to be
followed, the final output of the system could be used in restricted irrigations,
according to the World Health Organization recommendations.
Descrição
Palavras-chave
Efluentes, Ovos de helmintos, Reutilização, Lagoas de estabilização de esgoto, Effluents, Helminth eggs, Reutilize, Sewer stabilization lakes
Citação
COELHO, Wilma Maria; CAMPOS, Dulcinéa Maria Barbosa. Avaliação da eficiência de um sistema de lagoas de estabilização de esgotos na remoção de ovos de helmintos: proposta para a determinação do percentual de recuperação
de ovos de helmintos através do método de Schwartzbrod. Revista de Patologia Tropical, Goiânia, v. 25, n. 1, p. 61-72, jan./jun. 1996. Disponível em: <https://www.revistas.ufg.br/iptsp/article/view/18479/10957>.