Tannins from cashew tree (Anacardium occidentale) bark as a flocculant for water clarification
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
DOI: | 10.4136/ambi-agua.2815 |
Texto Completo: | http://dx.doi.org/10.4136/ambi-agua.2815 http://hdl.handle.net/11449/240215 |
Resumo: | Concern about the overexploitation of natural resources has increased in recent decades, especially involving water and its treatment. Paradoxically, one of the sources of water pollution is the treatment itself, due to the use of chemical flocculants, which end up generating sludge that may be highly aggressive to the environment. One of the ways to solve this problem is to use natural flocculants for this purpose, since they are biodegradable and do not harm nature. This study evaluated the efficiency of a natural flocculant produced from tannins extracted from the bark of the cashew tree (Anacardium occidentale) and compared it with two commercial coagulants, Tanfloc® and iron chloride. The water for treatment was collected from a weir. The cashew trees’ bark was collected, ground, and submitted to hot-water extraction to yield the tannins, and the extraction product was cationized. The flocculation tests were carried out using the jar test with solutions having concentrations of 33.3, 66.7, and 100 mg L-1. Turbidity and pH were analyzed before and after flocculation. Among the assessed flocculants, the cationized tannins produced the best responses both for removal of turbidity and final pH of the treated water. Tanfloc® also produced satisfactory results regarding turbidity removal. The iron chloride, besides not properly clarifying the water, left it very acidic. Since the cationized tannins practically did not change the pH and were effective in the removal of turbidity, they represent an interesting, sustainable alternative product to treat the water. |
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Tannins from cashew tree (Anacardium occidentale) bark as a flocculant for water clarificationUso de taninos da casca de cajueiro (Anacardium occidentale) como floculante para remoção de turbidez de águacationized tanninsnatural flocculating agenteremoval of turbiditywater treatmentConcern about the overexploitation of natural resources has increased in recent decades, especially involving water and its treatment. Paradoxically, one of the sources of water pollution is the treatment itself, due to the use of chemical flocculants, which end up generating sludge that may be highly aggressive to the environment. One of the ways to solve this problem is to use natural flocculants for this purpose, since they are biodegradable and do not harm nature. This study evaluated the efficiency of a natural flocculant produced from tannins extracted from the bark of the cashew tree (Anacardium occidentale) and compared it with two commercial coagulants, Tanfloc® and iron chloride. The water for treatment was collected from a weir. The cashew trees’ bark was collected, ground, and submitted to hot-water extraction to yield the tannins, and the extraction product was cationized. The flocculation tests were carried out using the jar test with solutions having concentrations of 33.3, 66.7, and 100 mg L-1. Turbidity and pH were analyzed before and after flocculation. Among the assessed flocculants, the cationized tannins produced the best responses both for removal of turbidity and final pH of the treated water. Tanfloc® also produced satisfactory results regarding turbidity removal. The iron chloride, besides not properly clarifying the water, left it very acidic. Since the cationized tannins practically did not change the pH and were effective in the removal of turbidity, they represent an interesting, sustainable alternative product to treat the water.Programa de Pós Graduação em Agronomia Departamento de Proteção Vegetal Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), Avenida Universitária, n° 3780, SPPrograma de Pós-graduação em Ciências Florestais Escola Agrícola de Jundiaí. Universidade Federal do Rio Grande do Norte (UFRN), RN 160, Km 03, s/n, RNDepartamento de Ciências Florestais Universidade Federal Rural de Pernambuco (UFRPE), Rua Dom Manuel de Medeiros, s/n, PEPrograma de Pós Graduação em Agronomia Departamento de Proteção Vegetal Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), Avenida Universitária, n° 3780, SPUniversidade Estadual Paulista (UNESP)Escola Agrícola de Jundiaí. Universidade Federal do Rio Grande do Norte (UFRN)Universidade Federal Rural de Pernambuco (UFRPE)Anjos, Bruna Ferreira dos [UNESP]Azevêdo, Tatiane Kelly Barbosa deSilva, Bruna Rafaella Ferreira daBraga, Renata MartinsPimenta, Alexandre SantosAndrade, Francisca Adriana Ferreira de2023-03-01T20:06:49Z2023-03-01T20:06:49Z2022-05-25info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.4136/ambi-agua.2815Revista Ambiente e Agua, v. 17, n. 3, 2022.1980-993Xhttp://hdl.handle.net/11449/24021510.4136/ambi-agua.28152-s2.0-85131644931Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengRevista Ambiente e Aguainfo:eu-repo/semantics/openAccess2023-03-01T20:06:49Zoai:repositorio.unesp.br:11449/240215Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T21:08:58.857370Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Tannins from cashew tree (Anacardium occidentale) bark as a flocculant for water clarification Uso de taninos da casca de cajueiro (Anacardium occidentale) como floculante para remoção de turbidez de água |
title |
Tannins from cashew tree (Anacardium occidentale) bark as a flocculant for water clarification |
spellingShingle |
Tannins from cashew tree (Anacardium occidentale) bark as a flocculant for water clarification Tannins from cashew tree (Anacardium occidentale) bark as a flocculant for water clarification Anjos, Bruna Ferreira dos [UNESP] cationized tannins natural flocculating agente removal of turbidity water treatment Anjos, Bruna Ferreira dos [UNESP] cationized tannins natural flocculating agente removal of turbidity water treatment |
title_short |
Tannins from cashew tree (Anacardium occidentale) bark as a flocculant for water clarification |
title_full |
Tannins from cashew tree (Anacardium occidentale) bark as a flocculant for water clarification |
title_fullStr |
Tannins from cashew tree (Anacardium occidentale) bark as a flocculant for water clarification Tannins from cashew tree (Anacardium occidentale) bark as a flocculant for water clarification |
title_full_unstemmed |
Tannins from cashew tree (Anacardium occidentale) bark as a flocculant for water clarification Tannins from cashew tree (Anacardium occidentale) bark as a flocculant for water clarification |
title_sort |
Tannins from cashew tree (Anacardium occidentale) bark as a flocculant for water clarification |
author |
Anjos, Bruna Ferreira dos [UNESP] |
author_facet |
Anjos, Bruna Ferreira dos [UNESP] Anjos, Bruna Ferreira dos [UNESP] Azevêdo, Tatiane Kelly Barbosa de Silva, Bruna Rafaella Ferreira da Braga, Renata Martins Pimenta, Alexandre Santos Andrade, Francisca Adriana Ferreira de Azevêdo, Tatiane Kelly Barbosa de Silva, Bruna Rafaella Ferreira da Braga, Renata Martins Pimenta, Alexandre Santos Andrade, Francisca Adriana Ferreira de |
author_role |
author |
author2 |
Azevêdo, Tatiane Kelly Barbosa de Silva, Bruna Rafaella Ferreira da Braga, Renata Martins Pimenta, Alexandre Santos Andrade, Francisca Adriana Ferreira de |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (UNESP) Escola Agrícola de Jundiaí. Universidade Federal do Rio Grande do Norte (UFRN) Universidade Federal Rural de Pernambuco (UFRPE) |
dc.contributor.author.fl_str_mv |
Anjos, Bruna Ferreira dos [UNESP] Azevêdo, Tatiane Kelly Barbosa de Silva, Bruna Rafaella Ferreira da Braga, Renata Martins Pimenta, Alexandre Santos Andrade, Francisca Adriana Ferreira de |
dc.subject.por.fl_str_mv |
cationized tannins natural flocculating agente removal of turbidity water treatment |
topic |
cationized tannins natural flocculating agente removal of turbidity water treatment |
description |
Concern about the overexploitation of natural resources has increased in recent decades, especially involving water and its treatment. Paradoxically, one of the sources of water pollution is the treatment itself, due to the use of chemical flocculants, which end up generating sludge that may be highly aggressive to the environment. One of the ways to solve this problem is to use natural flocculants for this purpose, since they are biodegradable and do not harm nature. This study evaluated the efficiency of a natural flocculant produced from tannins extracted from the bark of the cashew tree (Anacardium occidentale) and compared it with two commercial coagulants, Tanfloc® and iron chloride. The water for treatment was collected from a weir. The cashew trees’ bark was collected, ground, and submitted to hot-water extraction to yield the tannins, and the extraction product was cationized. The flocculation tests were carried out using the jar test with solutions having concentrations of 33.3, 66.7, and 100 mg L-1. Turbidity and pH were analyzed before and after flocculation. Among the assessed flocculants, the cationized tannins produced the best responses both for removal of turbidity and final pH of the treated water. Tanfloc® also produced satisfactory results regarding turbidity removal. The iron chloride, besides not properly clarifying the water, left it very acidic. Since the cationized tannins practically did not change the pH and were effective in the removal of turbidity, they represent an interesting, sustainable alternative product to treat the water. |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022-05-25 2023-03-01T20:06:49Z 2023-03-01T20:06:49Z |
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://dx.doi.org/10.4136/ambi-agua.2815 Revista Ambiente e Agua, v. 17, n. 3, 2022. 1980-993X http://hdl.handle.net/11449/240215 10.4136/ambi-agua.2815 2-s2.0-85131644931 |
url |
http://dx.doi.org/10.4136/ambi-agua.2815 http://hdl.handle.net/11449/240215 |
identifier_str_mv |
Revista Ambiente e Agua, v. 17, n. 3, 2022. 1980-993X 10.4136/ambi-agua.2815 2-s2.0-85131644931 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Revista Ambiente e Agua |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1822182266812497920 |
dc.identifier.doi.none.fl_str_mv |
10.4136/ambi-agua.2815 |