Estimativa do coeficiente de transferência de massa de oxigênio com o uso da técnica das sondas solúveis flutuantes: um estudo de laboratório

Ferreira, M.; Oliveira, Rafael de Almeida; Urzêdo, Luiz Eduardo da Silveira; Júnior, Guilherme Barbosa Lopes; Gonçalves, Julio Cesar de Souza Inácio

doi:10.1590/s1413-41522019173205

Cited by 3 publications

(1 citation statement)

References 31 publications

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“…This phenomenon is also known as "surface reaeration". Advances in knowledge about oxygen absorption by water bodies results in improved quantification of reaeration rate, which is an essential parameter of water quality models and which the environmental and water body recovery analyses are based (Gonçalves et al, 2017;Ferreira et al, 2019;.…”

Section: Introductionmentioning

confidence: 99%

The effect of SDS surfactant on surface reaeration coefficient: a laboratory scale approach

Ferreira¹,

Soeira

Ferreira

et al. 2020

Rev. ambiente água

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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.

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Section: Introductionmentioning

confidence: 99%

The effect of SDS surfactant on surface reaeration coefficient: a laboratory scale approach

Ferreira¹,

Soeira

Ferreira

et al. 2020

Rev. ambiente água

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Surface Reaeration in Tropical Headwater Streams: the Dissolution Rate of a Soluble Floating Probe as a New Variable for Reaeration Coefficient Prediction

Ferreira

Jordão

Gonçalves

et al. 2020

Water Air Soil Pollut

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Evaluation of dissolved oxygen sinks in water-stirring setups used in reaeration experiments

Ferreira

Luz

Silveira

et al. 2022

Water Science and Technology

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Dissolved oxygen (DO) is an essential parameter of water quality, and the surface reaeration process (K2) is the main source of DO in aquatic ecosystems. On a laboratory scale, reaeration measurements are performed using water-stirring setups (WSSs), but possible physical DO sinks are not considered in the WSSs. This paper aimed to assess the presence of physical DO sinks in WSSs. The experiments were carried out in four WSSs: circular hydraulic channel (CHC); straight hydraulic channel (SHC); turbine-stirred tank (TST); and oscillating grid tank (OGT). The physical DO sink was estimated by inserting a first-order term (K3, day−1) in the classic equation of DO balance. All WSSs presented physical DO sinks during the reaeration experiments: SHC (mean K3 = 4.58 day−1) > TST (mean K3 = 1.30 day−1) > CHC (mean K3 = 1.12 day−1) > OGT (mean K3 = 0.13 day−1). Physical DO sinks were originated from low-pressure zones located in WSSs, which was confirmed by the negative correlation (r = −0.78) between K3 and the static pressure in the suction pipeline of the SHC. This study presented additional information about identifying, and quantifying, physical DO sinks in WSSs, which are essential to produce a correct estimation of the K2.

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Estimativa do coeficiente de transferência de massa de oxigênio com o uso da técnica das sondas solúveis flutuantes: um estudo de laboratório

Cited by 3 publications

References 31 publications

The effect of SDS surfactant on surface reaeration coefficient: a laboratory scale approach

The effect of SDS surfactant on surface reaeration coefficient: a laboratory scale approach

Surface Reaeration in Tropical Headwater Streams: the Dissolution Rate of a Soluble Floating Probe as a New Variable for Reaeration Coefficient Prediction

Evaluation of dissolved oxygen sinks in water-stirring setups used in reaeration experiments

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