Implicações no transporte de íons em solos lateríticos fertirrigados com vinhaça

• Autor(a) principal: Silva, Natália Campos da [UNESP]
• Data de Publicação: 2018
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/204055; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2019-05-14/000914946.pdf
• topic: Ions; Vinhaça; Cana-de-açúcar; Águas subterrâneas - Poluição; Lixiviação; Brasil

In Brazil, vinasse has been increasingly used in sugarcane plantations as an alternative to soil fertirrigation, but this can lead to environmental problems and between them, contamination of groundwater by leaching processes. However, Brazilian soils often present lateritic characteristics, with different physical and hydraulic properties, mainly in the pore size distribution that results to be bimodal or multimodal, unlike other localities where the contaminant transport model were developed and that in general, have an unimodal distribution. In this context, the present study presents numerical modeling using HYDRUS 2D / 3D software to simulate the transport a generic ion present in the vinasse from two sources of contamination of a schematic profile considering the use of uni and bimodal models in soils with distribution of bimodal pores. For this purpose, laboratory tests of physical characterization and analytical determination of water retention curves in soil and unsaturated hydraulic conductivity in soils with different types of bimodal pore distribution were performed. The results showed that, for the hypothetical model analyzed, the vinasse ions may reach groundwater in a short time of 1 to 3 years and that the use of unimodal models in lateritic soils may lead to the underestimation of the magnitude and overestimation of the time of arrival of the final concentrations, especially in soils where the discontinuity of the pore distribution occurs at low suction values