Removal efficiency of phosphorus, cyanobacteria and cyanotoxins by the “flock & sink” mitigation technique in semi-arid eutrophic waters
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRN |
Texto Completo: | https://repositorio.ufrn.br/handle/123456789/30855 |
Resumo: | Geoengineering techniques have been used to control phosphorus and cyanobacteria in lakes promising greater and quicker chemical and ecological recovery. Techniques that use coagulants and clays to remove particulates and dissolved phosphorus from the water column have received great. In this study, bench-scale “flock & sink” assays were carried out to evaluate the efficiency of the coagulants aluminium sulphate (SUL), polyaluminium chloride (PAC) and chitosan (CHI), alone and combined with natural bentonite clays (BEN) and lanthanum-modified bentonite (LMB), to remove of phosphorus from a eutrophic reservoir in a semi-arid region of Brazil. In addition, the study seeks to assess the effects on the cyanobacteria density and the intra- and extracellular concentrations of cyanotoxins after the application of these geoengineering materials. The SUL and PAC coagulants effectively reduced the total phosphorus (TP), reactive soluble phosphorus (SRP), turbidity, chlorophyll-a, cyanobacteria density and intracellular microcystin, whereas CHI showed a low removal efficiency. Lanthanum-modified bentonite proved to be more effective than BEN; however, the application of the coagulants only was sufficient to successfully remove phosphorus and cyanobacteria from the water column. In addition, the efficiency of the “flock & sink” technique in cell removal varied among the cyanobacteria species. Small colonial species such as Aphanocapsa delicatissima, Merismopedia glauca and Merismopedia tenuissima were removed regardless of the treatment used, including those with CHI and BEN. As for the filamentous cyanobacteria, Cylindrospermopsis raciborskii, Geitlerinema amphibium, Planktothrix agardhii and Pseudanabaena catenata, removal was achieved only using PAC, SUL and LMB alone or when combined. The intracellular concentrations of saxitoxin and cylindrospermopsin and the extracellular fraction of these cyanotoxins and of microcystin were not influenced by the application of coagulants and clays. This indicates that cell lysis did not occur with the addition of the geoengineering materials. These results demonstrate that the “flock & sink” technique could be used for restoration of eutrophic waters |
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Becker, VanessaLucena-Silva, Daniely deMolozzi, JoselineSeveriano, Juliana dos SantosBarbosa, Jose Etham de Lucena2020-12-07T13:31:26Z2020-12-07T13:31:26Z2019-04-30LUCENA-SILVA, Daniely de; MOLOZZI, Joseline; SEVERIANO, Juliana dos Santos; BECKER, Vanessa; BARBOSA, José Etham de Lucena. Removal efficiency of phosphorus, cyanobacteria and cyanotoxins by the “flock & sink” mitigation technique in semi-arid eutrophic waters. Water Research, [S.L.], v. 159, p. 262-273, ago. 2019. Elsevier BV. Disponível em <https://www.sciencedirect.com/science/article/abs/pii/S0043135419303744?via%3Dihub>. Acesso em 20 out 2020. http://dx.doi.org/10.1016/j.watres.2019.04.057.0043-1354https://repositorio.ufrn.br/handle/123456789/3085510.1016/j.watres.2019.04.057Elsevier BVAttribution 3.0 Brazilhttp://creativecommons.org/licenses/by/3.0/br/info:eu-repo/semantics/openAccessBentoniteLanthanum-modified bentoniteFlocculationMicrocystinPolyaluminium chlorideChitosanAluminium sulphateRemoval efficiency of phosphorus, cyanobacteria and cyanotoxins by the “flock & sink” mitigation technique in semi-arid eutrophic watersinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleGeoengineering techniques have been used to control phosphorus and cyanobacteria in lakes promising greater and quicker chemical and ecological recovery. Techniques that use coagulants and clays to remove particulates and dissolved phosphorus from the water column have received great. In this study, bench-scale “flock & sink” assays were carried out to evaluate the efficiency of the coagulants aluminium sulphate (SUL), polyaluminium chloride (PAC) and chitosan (CHI), alone and combined with natural bentonite clays (BEN) and lanthanum-modified bentonite (LMB), to remove of phosphorus from a eutrophic reservoir in a semi-arid region of Brazil. In addition, the study seeks to assess the effects on the cyanobacteria density and the intra- and extracellular concentrations of cyanotoxins after the application of these geoengineering materials. The SUL and PAC coagulants effectively reduced the total phosphorus (TP), reactive soluble phosphorus (SRP), turbidity, chlorophyll-a, cyanobacteria density and intracellular microcystin, whereas CHI showed a low removal efficiency. Lanthanum-modified bentonite proved to be more effective than BEN; however, the application of the coagulants only was sufficient to successfully remove phosphorus and cyanobacteria from the water column. In addition, the efficiency of the “flock & sink” technique in cell removal varied among the cyanobacteria species. Small colonial species such as Aphanocapsa delicatissima, Merismopedia glauca and Merismopedia tenuissima were removed regardless of the treatment used, including those with CHI and BEN. As for the filamentous cyanobacteria, Cylindrospermopsis raciborskii, Geitlerinema amphibium, Planktothrix agardhii and Pseudanabaena catenata, removal was achieved only using PAC, SUL and LMB alone or when combined. The intracellular concentrations of saxitoxin and cylindrospermopsin and the extracellular fraction of these cyanotoxins and of microcystin were not influenced by the application of coagulants and clays. This indicates that cell lysis did not occur with the addition of the geoengineering materials. 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dc.title.pt_BR.fl_str_mv |
Removal efficiency of phosphorus, cyanobacteria and cyanotoxins by the “flock & sink” mitigation technique in semi-arid eutrophic waters |
title |
Removal efficiency of phosphorus, cyanobacteria and cyanotoxins by the “flock & sink” mitigation technique in semi-arid eutrophic waters |
spellingShingle |
Removal efficiency of phosphorus, cyanobacteria and cyanotoxins by the “flock & sink” mitigation technique in semi-arid eutrophic waters Becker, Vanessa Bentonite Lanthanum-modified bentonite Flocculation Microcystin Polyaluminium chloride Chitosan Aluminium sulphate |
title_short |
Removal efficiency of phosphorus, cyanobacteria and cyanotoxins by the “flock & sink” mitigation technique in semi-arid eutrophic waters |
title_full |
Removal efficiency of phosphorus, cyanobacteria and cyanotoxins by the “flock & sink” mitigation technique in semi-arid eutrophic waters |
title_fullStr |
Removal efficiency of phosphorus, cyanobacteria and cyanotoxins by the “flock & sink” mitigation technique in semi-arid eutrophic waters |
title_full_unstemmed |
Removal efficiency of phosphorus, cyanobacteria and cyanotoxins by the “flock & sink” mitigation technique in semi-arid eutrophic waters |
title_sort |
Removal efficiency of phosphorus, cyanobacteria and cyanotoxins by the “flock & sink” mitigation technique in semi-arid eutrophic waters |
author |
Becker, Vanessa |
author_facet |
Becker, Vanessa Lucena-Silva, Daniely de Molozzi, Joseline Severiano, Juliana dos Santos Barbosa, Jose Etham de Lucena |
author_role |
author |
author2 |
Lucena-Silva, Daniely de Molozzi, Joseline Severiano, Juliana dos Santos Barbosa, Jose Etham de Lucena |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Becker, Vanessa Lucena-Silva, Daniely de Molozzi, Joseline Severiano, Juliana dos Santos Barbosa, Jose Etham de Lucena |
dc.subject.por.fl_str_mv |
Bentonite Lanthanum-modified bentonite Flocculation Microcystin Polyaluminium chloride Chitosan Aluminium sulphate |
topic |
Bentonite Lanthanum-modified bentonite Flocculation Microcystin Polyaluminium chloride Chitosan Aluminium sulphate |
description |
Geoengineering techniques have been used to control phosphorus and cyanobacteria in lakes promising greater and quicker chemical and ecological recovery. Techniques that use coagulants and clays to remove particulates and dissolved phosphorus from the water column have received great. In this study, bench-scale “flock & sink” assays were carried out to evaluate the efficiency of the coagulants aluminium sulphate (SUL), polyaluminium chloride (PAC) and chitosan (CHI), alone and combined with natural bentonite clays (BEN) and lanthanum-modified bentonite (LMB), to remove of phosphorus from a eutrophic reservoir in a semi-arid region of Brazil. In addition, the study seeks to assess the effects on the cyanobacteria density and the intra- and extracellular concentrations of cyanotoxins after the application of these geoengineering materials. The SUL and PAC coagulants effectively reduced the total phosphorus (TP), reactive soluble phosphorus (SRP), turbidity, chlorophyll-a, cyanobacteria density and intracellular microcystin, whereas CHI showed a low removal efficiency. Lanthanum-modified bentonite proved to be more effective than BEN; however, the application of the coagulants only was sufficient to successfully remove phosphorus and cyanobacteria from the water column. In addition, the efficiency of the “flock & sink” technique in cell removal varied among the cyanobacteria species. Small colonial species such as Aphanocapsa delicatissima, Merismopedia glauca and Merismopedia tenuissima were removed regardless of the treatment used, including those with CHI and BEN. As for the filamentous cyanobacteria, Cylindrospermopsis raciborskii, Geitlerinema amphibium, Planktothrix agardhii and Pseudanabaena catenata, removal was achieved only using PAC, SUL and LMB alone or when combined. The intracellular concentrations of saxitoxin and cylindrospermopsin and the extracellular fraction of these cyanotoxins and of microcystin were not influenced by the application of coagulants and clays. This indicates that cell lysis did not occur with the addition of the geoengineering materials. These results demonstrate that the “flock & sink” technique could be used for restoration of eutrophic waters |
publishDate |
2019 |
dc.date.issued.fl_str_mv |
2019-04-30 |
dc.date.accessioned.fl_str_mv |
2020-12-07T13:31:26Z |
dc.date.available.fl_str_mv |
2020-12-07T13:31:26Z |
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.citation.fl_str_mv |
LUCENA-SILVA, Daniely de; MOLOZZI, Joseline; SEVERIANO, Juliana dos Santos; BECKER, Vanessa; BARBOSA, José Etham de Lucena. Removal efficiency of phosphorus, cyanobacteria and cyanotoxins by the “flock & sink” mitigation technique in semi-arid eutrophic waters. Water Research, [S.L.], v. 159, p. 262-273, ago. 2019. Elsevier BV. Disponível em <https://www.sciencedirect.com/science/article/abs/pii/S0043135419303744?via%3Dihub>. Acesso em 20 out 2020. http://dx.doi.org/10.1016/j.watres.2019.04.057. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufrn.br/handle/123456789/30855 |
dc.identifier.issn.none.fl_str_mv |
0043-1354 |
dc.identifier.doi.none.fl_str_mv |
10.1016/j.watres.2019.04.057 |
identifier_str_mv |
LUCENA-SILVA, Daniely de; MOLOZZI, Joseline; SEVERIANO, Juliana dos Santos; BECKER, Vanessa; BARBOSA, José Etham de Lucena. Removal efficiency of phosphorus, cyanobacteria and cyanotoxins by the “flock & sink” mitigation technique in semi-arid eutrophic waters. Water Research, [S.L.], v. 159, p. 262-273, ago. 2019. Elsevier BV. Disponível em <https://www.sciencedirect.com/science/article/abs/pii/S0043135419303744?via%3Dihub>. Acesso em 20 out 2020. http://dx.doi.org/10.1016/j.watres.2019.04.057. 0043-1354 10.1016/j.watres.2019.04.057 |
url |
https://repositorio.ufrn.br/handle/123456789/30855 |
dc.language.iso.fl_str_mv |
eng |
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eng |
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Attribution 3.0 Brazil http://creativecommons.org/licenses/by/3.0/br/ info:eu-repo/semantics/openAccess |
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Attribution 3.0 Brazil http://creativecommons.org/licenses/by/3.0/br/ |
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openAccess |
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Elsevier BV |
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Elsevier BV |
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