Lead sorption and leaching from an Inceptisol sample amended with sugarcane vinasse

Abstract

Vinasse is produced at high amounts by the ethanol and sugarcane spirits industries. Although the effects of vinasse on soil attributes are well elucidated, little is known about its effects on sorption and leaching of lead (Pb) from soils. This work evaluated the Pb sorption and leaching from disturbed topsoil samples (0-20 cm) of an Inceptisol, under the influence of sugarcane vinasse. Pb sorption was evaluated by batch sorption method, using air-dried samples (< 2 mm) treated with pure (100%), and diluted (20%, and 50%) vinasse. The amended soil samples were further reacted with 0.05; 0.10; 0.25; 0.50, and 0.75 mmol L -1 of Pb. To measure the Pb leached, soil columns were packed in PVC tubes, 12-cm long with 4-cm internal diameter filled with 200 g of treated soil. The vinasse doses applied over the columns corresponded to 0 (control), 150 and 300 m 3 ha -1 . Seven days later, 5 mL of a Pb solution (100 mmol L -1 ) was applied on the columns; they were successively leached and Pb was measured in the leachates. The vinasse increased the maximum sorption capacity and binding energy of Pb with the soil when at equilibrium conditions. However, at non-equilibrium conditions, the vinasse enhanced the Pb leaching. From these results, it is advised that special attention must be given to Pb contaminated areas where vinasse is applied. Key words: sugarcane cultivation, organometallic complexes, organic waste, Pb mobility Sorção e lixiviação de chumbo em amostra de um Cambissolo tratado com vinhaça de cana-de-açúcar RESUMO: A vinhaça é produzida em grandes quantidades pela indústria de etanol e de aguardente (cachaça). Embora os efeitos da vinhaça nos atributos do solo sejam bem conhecidos, pouco se sabe sobre eles no comportamento sortivo de chumbo (Pb). Avaliaram-se a sorção e a lixiviação de Pb em amostras da camada superficial (0-20 cm) de um Cambissolo Háplico Tb Distrófico típico (CXbd) sob influência da vinhaça. Para o ensaio de sorção, as amostras foram peneiradas em malha de 2 mm, tratadas com vinhaça diluída 20% e 50% e ao natural (100%), empregando água destilada nas amostras controle. Em seguida, soluções com 0,05; 0,10; 0,25; 0,50 e 0,75 mmol L -1 de Pb foram adicionadas às amostras de solo. Para o ensaio de lixiviação, foram preparadas colunas de solo em tubos de PVC de 12 cm de altura e 4 cm de diâmetro interno, contendo 200 g de solo. As doses de vinhaça aplicadas sobre as colunas foram correspondentes a 150 e 300 m 3 ha -1 . As colunas foram mantidas incubadas com vinhaça por sete dias. Após esse período, foram aplicados sobre cada coluna 5 mL de uma solução de concentração 100 mmol L -1 de Pb e, posteriormente, realizadas sucessivas lixiviações, coletando-se o percolado para determinação do teor de Pb. A vinhaça aumentou a capacidade máxima de adsorção de Pb e sua energia de ligação com o solo em condições de equilíbrio (ensaio de sorção), mas em condições de não equilíbrio (ensaio de lixiviação em colunas), a vinhaça aumentou a lixiviação de Pb. Com base nesses resultados, atenção especial ...

Anaerobic digestion of vinasse from sugarcane ethanol production in Brazil: Challenges and perspectives

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Soil change induced by the application of biodigested vinasse concentrate, and its effects on growth of sugarcane

“…Vinasse has high water content, organic matter (OM), and potassium (K), but also contains nitrogen (N) and other mineral nutrients in low concentrations (Ribeiro et al, 2010). This byproduct is therefore regularly used as soil fertilizer in sugarcane fields with good results (Bebé et al, 2009;Britto et al, 2009;Silva et al, 2014).…”

Vinasse application to sugar cane fields. Effect on the unsaturated zone and groundwater at Valle del Cauca (Colombia)

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