Mobilidade do zinco e do cobre em Argissolo com aplicação de argila bentonita

Tito, Gilvanise Alves; Chaves, Lúcia Helena Garófalo; Guerra, Hugo Orlando Carvallo

doi:10.1590/s1415-43662012000900003

Cited by 9 publications

(6 citation statements)

References 15 publications

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“…According to these authors, the fine soil aggregates and clay minerals have a great capacity to retain heavy metals due to their great surface area, corroborating Bertol et al (2010) and Li et al (2018). Tito et al (2012) observed that the incorporation of bentonite in a soil contaminated with copper, favored the adsorption of this element, avoiding the percolation and potential contamination of the groundwater.…”

Section: Copper Concentration In the Soil And In The Soil Leachatementioning

confidence: 63%

“…The use of bentonite clays as adsorbents have advantages upon many other commercially available adsorbents in terms of low-cost, an abundant availability, high specific area, excellent adsorption properties, nontoxic nature and great potential for ion exchange. Tito et al (2012), evaluating the effect of bentonite on the mobility of zinc and copper in columns of Argisol soil irrigated with contaminated water, observed that copper was strongly adsorbed by the soil / bentonite complex. The constant concern with soil and groundwater pollution has resulted in several studies of solutes displacement in soil columns.…”

Section: Introductionmentioning

confidence: 99%

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Miscible displacement of copper in soil columns using increasing doses of bentonite

et al. 2019

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The objective of this research was to evaluate the effect of applying increasing doses of bentonite to the soil on the miscible displacement of copper, quantifying copper retention in the soil and elimination by leachate, in order to prevent potential risks for environmental contamination. The experiment was conducted on a laboratory using leaching columns filled by a sandy texture soil contaminated with 250 mg kg-1 of copper each. The experimental design was a completely randomized with four doses of bentonite, 0; 30; 60 and 90 t ha-1, and three replications totalizing 12 experimental units. The leaching columns were made with PVC tubes constituted by three rings, overlaid and joined with silicone glue. Each column was filled with 4 kg of Cu contaminated soil, mixed with the doses of bentonite specified by the treatments (0; 45; 90 and 135 g). After the filling of the columns, each one received five pore volumes of distillated water, and left to percolation under a steady state flux. After percolation, the Cu concentrations in the soil and in the percolate, the breakthrough curves of the flux density and the percolation velocity were determined. The results were submitted to variance analyses using the F test and regressions. The increasing doses of bentonite until 90 t ha-1 increased the adsorption of copper by the soil, reducing the percolation of this element around 72%. Bentonite application to the soil decreased the flux density and flux velocity of the copper percolation, diminishing the potential risks for the environment contamination.

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Section: Copper Concentration In the Soil And In The Soil Leachatementioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Miscible displacement of copper in soil columns using increasing doses of bentonite

et al. 2019

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“…Indirectly, this factor being a parameter that expresses the soil's ability to retain ions, it is clear its dependence on the interactions between the liquid phase and the solid phase during the percolation of the soil solution (TITO et al, 2012).…”

Section: Resultsmentioning

confidence: 99%

DISTRIBUTION OF SOLUTES NO3 - E Ca IN SOIL COLUMNS WITH VINASSE

Silva¹,

Cunha²,

Teixeira³

et al. 2016

RBAI

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Simulation models can provide a better understanding of the processes occurring in the soil displacement relative to solutes, and is applicable to research tools to minimize impacts on the environment. Thus, this study aimed to determine the retardation factors, diffusive-dispersive coefficients involved in the transport and distribution of vinasse effluent curves for the ions Calcium and Nitrate in soil columns. The Alfisol was collected in the rural municipality of Piracicaba-SP, soil samples were collected at 0-0.20 m depth. For the manufacture of columns was used PVC tubing 0.25 m long and 0.05 cm in diameter, wire mesh, and fast filter paper at one end, fastened by a "cap" bottomless PVC screw. The volumes of 10 mL were collected, defined in terms of pore volume (related to the porosity of the soil, taken generally around 50%) and the amount required to be performed the analysis of chemical components NO3 -(nitrate) and Ca (calcium). We used the computer program to calculate the DISP parameters of solute transport in soil miscible fluid displacement. The transport parameters showed the positive effects of adsorption and calcium ion present in the shift vinasse. For the nitrate ion, despite the breakthrough curve not have adjusted the parameters indicate low adsorption to soil may be moved to greater depths.Keywords: absorption, convection, diffusion-dispersion. Modelos de simulação podem proporcionar um entendimento melhor dos processos que ocorrem no solo, relativos ao deslocamento de solutos, constituindo ferramentas aplicáveis a estudos de minimização de impactos ao meio ambiente. Dessa forma, o presente trabalho teve por objetivo determinar os fatores de retardamento, coeficientes dispersivos-difusivos envolvidos no transporte da vinhaça e distribuição das curvas de efluente para os íons Nitrato e Cálcio em colunas de solo. O Nitossolo Vermelho eutrófico (NVe) foi coletado na zona rural do município de Piracicaba-SP, as amostras de solo foram coletadas nas camadas de 0-0,20 m de profundidade. Para a confecção das colunas utilizou-se tubos de PVC com 0,25 m de comprimento, e 0,05 m de diâmetro, tela metálica, e papel de filtro rápido em uma das extremidades, presos por um "cap" PVC rosqueável sem fundo. Os volumes coletados foram de 10 mL, definidos em função do volume de poros (relacionados com a porosidade do solo, assumida em termos gerais em torno de 50%) e da quantidade necessária para serem realizadas as análises dos componentes químicos NO3 DISTRIBUIÇÃO DE SOLUTOS-(Nitrato) e Ca (Cálcio). Utilizou-se o programa computacional DISP para cálculo dos parâmetros de transporte de solutos no solo em deslocamento de fluidos miscíveis. Os parâmetros de transporte evidenciaram positivamente os efeitos de adsorção e de deslocamento do íon cálcio presente na vinhaça. Para o íon nitrato, apesar da curva de eluição não ter se ajustado, os parâmetros indicam baixa adsorção ao solo podendo ser deslocado para maiores profundidades.Palavras-chave: absorção, adsorção, convecção, difusão-dipersão.

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“…Segundo Tito et al (2012), quanto menor a densidade de fluxo e velocidade de avanço da solução na coluna de solo, maior é o tempo de contato entre os íons e os colóides do solo promovendo maior oportunidade de retenção dos solutos. O mesmo comportamento foi determinado por Rossi et al (2007), que compararam valores do fator de retardamento, dispersividade e do coeficiente de dispersão para o íon nitrato considerando amostras com estrutura e destorroadas.…”

Section: Resultsunclassified