Trace elements in Ultisol irrigated with landfill leachate and public-supply water

Abstract

A B S T R A C TLandfill leachates have considerable amounts of organic matter and mineral nutrients and, when applied in environmentally adequate amounts, show fertilizing potential for the soil-plant system. This study aimed to analyze the effect of landfill leachate (LFL) and the public-supply water (PSW) depths on the contents of trace elements in an Ultisol. This work was carried out from April 21 to August 21, 2012, in split-split-plot scheme; LFL and PSW depths (T1 -0 mm of LFL and 1067 mm of PSW; T2 -60 mm of LFL and 1067 mm of PSW, T3 -120 mm of LFL and 1067 of PSW, T4 -180 mm of LFL and 1067 of PSW, and T5 -240 mm of LFL and 1067 mm of PSW) in the plots, the analyzed layers (0-0.2 m and 0.2-0.4 m) in the subplots and the sampling times (0, 30, 60, 90 and 120 days) in the sub-subplots. Soil samples were collected every 30 days for 120 days to characterize the trace elements Fe, Mn, Pb, Cd, Zn, Cu and Ni. There was leaching of Pb, Cd and Ni in the Ultisol, while the T2 treatment was the most recommended to prevent contamination of groundwater.Elemento traços em um argissolo irrigado com percolado de aterro e água de abastecimento público R E S U M O Os percolados de aterros sanitários possuem aportes apreciáveis de matéria orgânica e nutrientes minerais e, quando aplicados em quantidades ambientalmente adequadas, revelam fertilizante potencial para o sistema solo-planta. Objetivou-se analisar o efeito de lâminas de percolado de aterro sanitário (LFL) e água de abastecimento público (PSW) nos teores de elementos traços em um argissolo. O experimento foi montado no período de 21/04 de 2012 a 21/08 de 2012, em esquema de parcelas subsubdivididas tendo, nas parcelas, as lâminas de LFL e PSW (T1 -0 mm de LFL e 1067 mm de PSW; T2 -60 mm de LFL e 1067 mm de PSW; T3 -120 mm de LFL e 1067 de PSW; T4 -180 mm de LFL e 1067 de PSW; e T5 -240 mm de LFL e 1067 mm de PSW); nas subparcelas as profundidades analisadas (0 a 0,2 m e 0,2 a 0,4 m) e nas subsubparcelas os tempos de amostragem (0, 30, 60, 90 e 120 dias). Amostras de solo foram coletadas a cada 30 dias durante 120 dias para caracterização dos elementos traço Fe, Mn, Pb, Cd, Zn, Cu e Ni. Houve lixiviação de Pb, Cd e Ni no argissolo enquanto o tratamento T2 foi o mais recomendado para evitar a contaminação do lençol freático. Key words:liquid waste agricultural use heavy metals Palavras-chave: resíduo líquido aproveitamento agrícola metais pesados

Landfill leachate as nutritional source in castor bean cultivation under semi-arid conditions

“…Nevertheless, these results were lower than those reported by Alves et al (2015) for the same cultivar, a mean value of 21.5 mm in plants under water replacement levels and different populations. Also for the cultivar BRS Energia, the SD (18 mm) found by Silva et al (2015) was larger than the one observed in the present study, which corroborates the reasoning based on the influence of the osmotic or ionic effect resulting from successive applications of LL.…”

“…Given its high polluting potential (Avramidou et al, 2013), the destination of landfill leachate (Vera-Romero et al, 2015) must not be considered separately from its also high nutritional content (Nunes Júnior et al, 2016) especially for agriculture, provided that adequate soil conservation practices are performed (Coelho et al, 2015) and provided that it is applied in crops allowed by the legislation, such as oilseed crops.…”