The effect of SDS surfactant on surface reaeration coefficient: a laboratory scale approach
Surface reaeration coefficient (K2), which represents the transfer of oxygen at the air-water interface, is an important variable in aquatic ecosystems. K2 is influenced by several factors, including surfactants; furthermore, this coefficient is used in water-quality models, which requires its corre...
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| Format: | Article |
| Language: | English |
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Instituto de Pesquisas Ambientais em Bacias Hidrográficas (IPABHi)
2020-08-01
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| Series: | Revista Ambiente & Água |
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| Online Access: | https://www.scielo.br/scielo.php?script=sci_arttext&pid=S1980-993X2020000400314&lng=en&nrm=iso&tlng=en |
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| author | Murilo de Souza Ferreira Thiago Vinicius Ribeiro Soeira Deusmaque Carneiro Ferreira Mário Sergio da Luz Cristiano Poleto Julio Cesar de Souza Inácio Gonçalves |
| author_facet | Murilo de Souza Ferreira Thiago Vinicius Ribeiro Soeira Deusmaque Carneiro Ferreira Mário Sergio da Luz Cristiano Poleto Julio Cesar de Souza Inácio Gonçalves |
| author_sort | Murilo de Souza Ferreira |
| collection | DOAJ |
| description | Surface reaeration coefficient (K2), which represents the transfer of oxygen at the air-water interface, is an important variable in aquatic ecosystems. K2 is influenced by several factors, including surfactants; furthermore, this coefficient is used in water-quality models, which requires its correct estimation. This study evaluated the effects of the surfactant Sodium Dodecyl Sulfate (SDS) on K2 in two different experimental systems. In a cylindrical reactor with a turbine-type mechanical stirrer, 15 reaeration experiments were carried out with SDS concentrations of 0.0; 0.25; 0.5; 1.0 and 1.5 mMol L-1 and stirrer rotation velocities of 25, 50 and 100 rpm. In a circular hydraulic channel, 8 reaeration experiments were carried out, in triplicate, with SDS concentrations of 0 and 1.5 mMol L-1 and agitation levels of Reynolds 4,500, 37,500; 49,200 and 54,000. In the reactor, regardless of the rotation velocity, the surfactant reduced K2 by 20%, due to a superficial film formation at the interface that made oxygen transfer difficult, due to a phenomenon known as “barrier effect”. In the channel, an approximate K2 reduction of 15% occurred at higher levels of water agitation. In the presence of surfactants, and at low levels of agitation, phenomena that increase K2 (i.e., Marangoni effect) may coexist with those that reduce K2 (i.e., barrier effect). We concluded that the presence of SDS in aquatic environments should be considered when estimating the surface reaeration coefficient, because this surfactant can contribute to uncertain K2 estimation. |
| first_indexed | 2024-12-18T14:19:07Z |
| format | Article |
| id | doaj.art-26d0b20b8da6418099c7f5820837dfb6 |
| institution | Directory Open Access Journal |
| issn | 1980-993X |
| language | English |
| last_indexed | 2024-12-18T14:19:07Z |
| publishDate | 2020-08-01 |
| publisher | Instituto de Pesquisas Ambientais em Bacias Hidrográficas (IPABHi) |
| record_format | Article |
| series | Revista Ambiente & Água |
| spelling | doaj.art-26d0b20b8da6418099c7f5820837dfb62022-12-21T21:04:54ZengInstituto de Pesquisas Ambientais em Bacias Hidrográficas (IPABHi)Revista Ambiente & Água1980-993X2020-08-0115411210.4136/ambi-agua.2536The effect of SDS surfactant on surface reaeration coefficient: a laboratory scale approachMurilo de Souza Ferreira0https://orcid.org/0000-0003-3943-866XThiago Vinicius Ribeiro Soeira1https://orcid.org/0000-0003-0321-5448Deusmaque Carneiro Ferreira2https://orcid.org/0000-0001-9338-0863Mário Sergio da Luz3https://orcid.org/0000-0003-1226-9480Cristiano Poleto4https://orcid.org/0000-0001-7376-1634Julio Cesar de Souza Inácio Gonçalves5https://orcid.org/0000-0001-5584-5527Departamento de Hidráulica e Saneamento. Laboratório de Biotoxicologia de Águas Continentais e Efluentes. Escola de Engenharia de São Carlos da Universidade de São Paulo (EESC-USP), Avenida Trabalhador São-Carlense, n° 400, CEP: 13566-590, São Carlos, SP, Brazil. Programa de Pós-Graduação em Ciência e Tecnologia Ambiental. Instituto de Ciências Exatas e Tecnológicas. Universidade Federal do Triângulo Mineiro (UFTM), Avenida. Dr. Randolfo Borges Júnior, n° 1400, CEP: 38064-200, Uberaba, MG, Brazil. Programa de Pós-Graduação em Ciência e Tecnologia Ambiental. Instituto de Ciências Exatas e Tecnológicas. Universidade Federal do Triângulo Mineiro (UFTM), Avenida. Dr. Randolfo Borges Júnior, n° 1400, CEP: 38064-200, Uberaba, MG, Brazil. Programa de Pós-Graduação em Ciência e Tecnologia Ambiental. Instituto de Ciências Exatas e Tecnológicas. Universidade Federal do Triângulo Mineiro (UFTM), Avenida. Dr. Randolfo Borges Júnior, n° 1400, CEP: 38064-200, Uberaba, MG, Brazil. Departamento de Hidromecânica e Hidrologia. Instituto de Pesquisas Hidráulicas. Universidade Federal do Rio Grande do Sul (UFRGS), Avenida Bento Gonçalves, n° 9500, CEP: 91501-970, Porto Alegre, RS, Brazil. Programa de Pós-Graduação em Ciência e Tecnologia Ambiental. Instituto de Ciências Exatas e Tecnológicas. Universidade Federal do Triângulo Mineiro (UFTM), Avenida. Dr. Randolfo Borges Júnior, n° 1400, CEP: 38064-200, Uberaba, MG, Brazil. Surface reaeration coefficient (K2), which represents the transfer of oxygen at the air-water interface, is an important variable in aquatic ecosystems. K2 is influenced by several factors, including surfactants; furthermore, this coefficient is used in water-quality models, which requires its correct estimation. This study evaluated the effects of the surfactant Sodium Dodecyl Sulfate (SDS) on K2 in two different experimental systems. In a cylindrical reactor with a turbine-type mechanical stirrer, 15 reaeration experiments were carried out with SDS concentrations of 0.0; 0.25; 0.5; 1.0 and 1.5 mMol L-1 and stirrer rotation velocities of 25, 50 and 100 rpm. In a circular hydraulic channel, 8 reaeration experiments were carried out, in triplicate, with SDS concentrations of 0 and 1.5 mMol L-1 and agitation levels of Reynolds 4,500, 37,500; 49,200 and 54,000. In the reactor, regardless of the rotation velocity, the surfactant reduced K2 by 20%, due to a superficial film formation at the interface that made oxygen transfer difficult, due to a phenomenon known as “barrier effect”. In the channel, an approximate K2 reduction of 15% occurred at higher levels of water agitation. In the presence of surfactants, and at low levels of agitation, phenomena that increase K2 (i.e., Marangoni effect) may coexist with those that reduce K2 (i.e., barrier effect). We concluded that the presence of SDS in aquatic environments should be considered when estimating the surface reaeration coefficient, because this surfactant can contribute to uncertain K2 estimation.https://www.scielo.br/scielo.php?script=sci_arttext&pid=S1980-993X2020000400314&lng=en&nrm=iso&tlng=ensurface reaerationsurfactantswater quality modeling |
| spellingShingle | Murilo de Souza Ferreira Thiago Vinicius Ribeiro Soeira Deusmaque Carneiro Ferreira Mário Sergio da Luz Cristiano Poleto Julio Cesar de Souza Inácio Gonçalves The effect of SDS surfactant on surface reaeration coefficient: a laboratory scale approach Revista Ambiente & Água surface reaeration surfactants water quality modeling |
| title | The effect of SDS surfactant on surface reaeration coefficient: a laboratory scale approach |
| title_full | The effect of SDS surfactant on surface reaeration coefficient: a laboratory scale approach |
| title_fullStr | The effect of SDS surfactant on surface reaeration coefficient: a laboratory scale approach |
| title_full_unstemmed | The effect of SDS surfactant on surface reaeration coefficient: a laboratory scale approach |
| title_short | The effect of SDS surfactant on surface reaeration coefficient: a laboratory scale approach |
| title_sort | effect of sds surfactant on surface reaeration coefficient a laboratory scale approach |
| topic | surface reaeration surfactants water quality modeling |
| url | https://www.scielo.br/scielo.php?script=sci_arttext&pid=S1980-993X2020000400314&lng=en&nrm=iso&tlng=en |
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