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: | 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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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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1752129751790649344 |