Microfauna as indicator of copper, zinc, and cycloheximide in activated sludge processes

Detalhes bibliográficos
Autor(a) principal: Nicolau, Ana
Data de Publicação: 2007
Outros Autores: Mota, M., Lima, Nelson
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/1822/6652
Resumo: Microfauna, comprising protists and little metazoan, has proved to be a useful tool for assessing the occurrence of pollution in wastewater treatment systems, namely on activated-sludge plants. In the present work, the response of the microfauna communities of activated sludge to three toxicants—copper, zinc, and cycloheximide—was studied by means of a series of assays using a bench-scale plant. Along with the community descriptive parameters such as density, taxonomic richness, and the use of biological indexes—the Shannon-Wiener Index and the Sludge Biotic Index—several operating parameters were determined in order to allow for the comparison and possible correlations between the biological and the physical–chemical parameters. The results emphasize the ability of activated sludge communities, both bacteria and microfauna, to survive and to react to toxicants. High concentrations of copper and zinc (20 and 50 mg/L) prevented the satisfactory plant efficiency and the healthy state of the microfauna, including its survival. Cycloheximide did not have important and lasting effects below 5 mg/L. Among physical–chemical parameters, removal of soluble chemical oxygen demand seems to be the only one that presents patterns revealing a cause–effect relation along toxicological assays. Biological parameters were much more sensitive and coherent. The Sludge Biotic Index was, by far, the best tool in detecting intoxicant effects in the microfauna communities. Considering all parameters studied, copper was more toxic than zinc. Cycloheximide, in the range of concentration tested, was less toxic than these metals. The work highlights the role of microfauna as an indicator of toxicants entrance, besides the well-documented indicator value of plant operation conditions and efficiency.
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spelling Microfauna as indicator of copper, zinc, and cycloheximide in activated sludge processesMicrofaunaActivated-sludge performanceToxicantsProtistsSludge Biotic IndexScience & TechnologyMicrofauna, comprising protists and little metazoan, has proved to be a useful tool for assessing the occurrence of pollution in wastewater treatment systems, namely on activated-sludge plants. In the present work, the response of the microfauna communities of activated sludge to three toxicants—copper, zinc, and cycloheximide—was studied by means of a series of assays using a bench-scale plant. Along with the community descriptive parameters such as density, taxonomic richness, and the use of biological indexes—the Shannon-Wiener Index and the Sludge Biotic Index—several operating parameters were determined in order to allow for the comparison and possible correlations between the biological and the physical–chemical parameters. The results emphasize the ability of activated sludge communities, both bacteria and microfauna, to survive and to react to toxicants. High concentrations of copper and zinc (20 and 50 mg/L) prevented the satisfactory plant efficiency and the healthy state of the microfauna, including its survival. Cycloheximide did not have important and lasting effects below 5 mg/L. Among physical–chemical parameters, removal of soluble chemical oxygen demand seems to be the only one that presents patterns revealing a cause–effect relation along toxicological assays. Biological parameters were much more sensitive and coherent. The Sludge Biotic Index was, by far, the best tool in detecting intoxicant effects in the microfauna communities. Considering all parameters studied, copper was more toxic than zinc. Cycloheximide, in the range of concentration tested, was less toxic than these metals. The work highlights the role of microfauna as an indicator of toxicants entrance, besides the well-documented indicator value of plant operation conditions and efficiency.Fundação para a Ciência e a Tecnologia (FCT)Mary Ann Liebert Inc.Universidade do MinhoNicolau, AnaMota, M.Lima, Nelson2007-052007-05-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/6652eng“Environmental Engineering Science”. ISSN 1092-8758. 24:2 (May 2007) 434-445.1092-875810.1089/ees.2006.06-0005info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-21T11:55:11Zoai:repositorium.sdum.uminho.pt:1822/6652Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T18:44:42.204091Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Microfauna as indicator of copper, zinc, and cycloheximide in activated sludge processes
title Microfauna as indicator of copper, zinc, and cycloheximide in activated sludge processes
spellingShingle Microfauna as indicator of copper, zinc, and cycloheximide in activated sludge processes
Nicolau, Ana
Microfauna
Activated-sludge performance
Toxicants
Protists
Sludge Biotic Index
Science & Technology
title_short Microfauna as indicator of copper, zinc, and cycloheximide in activated sludge processes
title_full Microfauna as indicator of copper, zinc, and cycloheximide in activated sludge processes
title_fullStr Microfauna as indicator of copper, zinc, and cycloheximide in activated sludge processes
title_full_unstemmed Microfauna as indicator of copper, zinc, and cycloheximide in activated sludge processes
title_sort Microfauna as indicator of copper, zinc, and cycloheximide in activated sludge processes
author Nicolau, Ana
author_facet Nicolau, Ana
Mota, M.
Lima, Nelson
author_role author
author2 Mota, M.
Lima, Nelson
author2_role author
author
dc.contributor.none.fl_str_mv Universidade do Minho
dc.contributor.author.fl_str_mv Nicolau, Ana
Mota, M.
Lima, Nelson
dc.subject.por.fl_str_mv Microfauna
Activated-sludge performance
Toxicants
Protists
Sludge Biotic Index
Science & Technology
topic Microfauna
Activated-sludge performance
Toxicants
Protists
Sludge Biotic Index
Science & Technology
description Microfauna, comprising protists and little metazoan, has proved to be a useful tool for assessing the occurrence of pollution in wastewater treatment systems, namely on activated-sludge plants. In the present work, the response of the microfauna communities of activated sludge to three toxicants—copper, zinc, and cycloheximide—was studied by means of a series of assays using a bench-scale plant. Along with the community descriptive parameters such as density, taxonomic richness, and the use of biological indexes—the Shannon-Wiener Index and the Sludge Biotic Index—several operating parameters were determined in order to allow for the comparison and possible correlations between the biological and the physical–chemical parameters. The results emphasize the ability of activated sludge communities, both bacteria and microfauna, to survive and to react to toxicants. High concentrations of copper and zinc (20 and 50 mg/L) prevented the satisfactory plant efficiency and the healthy state of the microfauna, including its survival. Cycloheximide did not have important and lasting effects below 5 mg/L. Among physical–chemical parameters, removal of soluble chemical oxygen demand seems to be the only one that presents patterns revealing a cause–effect relation along toxicological assays. Biological parameters were much more sensitive and coherent. The Sludge Biotic Index was, by far, the best tool in detecting intoxicant effects in the microfauna communities. Considering all parameters studied, copper was more toxic than zinc. Cycloheximide, in the range of concentration tested, was less toxic than these metals. The work highlights the role of microfauna as an indicator of toxicants entrance, besides the well-documented indicator value of plant operation conditions and efficiency.
publishDate 2007
dc.date.none.fl_str_mv 2007-05
2007-05-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/1822/6652
url http://hdl.handle.net/1822/6652
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv “Environmental Engineering Science”. ISSN 1092-8758. 24:2 (May 2007) 434-445.
1092-8758
10.1089/ees.2006.06-0005
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Mary Ann Liebert Inc.
publisher.none.fl_str_mv Mary Ann Liebert Inc.
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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