Tannins from cashew tree (Anacardium occidentale) bark as a flocculant for water clarification

Detalhes bibliográficos
Autor(a) principal: Anjos,Bruna Ferreira dos
Data de Publicação: 2022
Outros Autores: Azevêdo,Tatiane Kelly Barbosa de, Silva,Bruna Rafaella Ferreira da, Braga,Renata Martins, Pimenta,Alexandre Santos, Andrade,Francisca Adriana Ferreira De
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Revista Ambiente & Água
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1980-993X2022000300300
Resumo: Abstract 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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spelling Tannins from cashew tree (Anacardium occidentale) bark as a flocculant for water clarificationcationized tanninsnatural flocculating agenteremoval of turbiditywater treatmentAbstract 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.Instituto de Pesquisas Ambientais em Bacias Hidrográficas2022-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1980-993X2022000300300Revista Ambiente & Água v.17 n.3 2022reponame:Revista Ambiente & Águainstname:Instituto de Pesquisas Ambientais em Bacias Hidrográficas (IPABHI)instacron:IPABHI10.4136/ambi-agua.2815info:eu-repo/semantics/openAccessAnjos,Bruna Ferreira dosAzevêdo,Tatiane Kelly Barbosa deSilva,Bruna Rafaella Ferreira daBraga,Renata MartinsPimenta,Alexandre SantosAndrade,Francisca Adriana Ferreira Deeng2022-06-15T00:00:00Zoai:scielo:S1980-993X2022000300300Revistahttp://www.ambi-agua.net/PUBhttps://old.scielo.br/oai/scielo-oai.php||ambi.agua@gmail.com1980-993X1980-993Xopendoar:2022-06-15T00:00Revista Ambiente & Água - Instituto de Pesquisas Ambientais em Bacias Hidrográficas (IPABHI)false
dc.title.none.fl_str_mv Tannins from cashew tree (Anacardium occidentale) bark as a flocculant for water clarification
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
Anjos,Bruna Ferreira dos
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
title_full_unstemmed 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
author_facet Anjos,Bruna Ferreira dos
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.author.fl_str_mv Anjos,Bruna Ferreira dos
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 Abstract 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 2022-01-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1980-993X2022000300300
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1980-993X2022000300300
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.4136/ambi-agua.2815
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Instituto de Pesquisas Ambientais em Bacias Hidrográficas
publisher.none.fl_str_mv Instituto de Pesquisas Ambientais em Bacias Hidrográficas
dc.source.none.fl_str_mv Revista Ambiente & Água v.17 n.3 2022
reponame:Revista Ambiente & Água
instname:Instituto de Pesquisas Ambientais em Bacias Hidrográficas (IPABHI)
instacron:IPABHI
instname_str Instituto de Pesquisas Ambientais em Bacias Hidrográficas (IPABHI)
instacron_str IPABHI
institution IPABHI
reponame_str Revista Ambiente & Água
collection Revista Ambiente & Água
repository.name.fl_str_mv Revista Ambiente & Água - Instituto de Pesquisas Ambientais em Bacias Hidrográficas (IPABHI)
repository.mail.fl_str_mv ||ambi.agua@gmail.com
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