Freitas Joycyely M A S, Netto André M, Corrêa Marcus M, Xavier Bruno T L, Assis Fernando X DE
Programa de Pós-Graduação em Engenharia Ambiental, DTR-UFRPE, Rua Dom Manoel de Medeiros, s/n, Dois Irmãos, 52171-900 Recife, PE, Brazil.
Programa de Pós-Graduação em Tecnologias Energéticas e Nucleares, DEN-UFPE, Av. Prof. Luiz Freire, 1000, 50740-545 Recife, PE, Brazil.
An Acad Bras Cienc. 2018 Jan-Mar;90(1):541-555. doi: 10.1590/0001-3765201720160910. Epub 2017 Oct 16.
Vinasse is a byproduct of the process of distillation of sugarcane juice for the manufacture of sugar and alcohol. Because it is rich in nutrients, mainly potassium (K), is used as fertilizer and applied via fertigation, without concerning for the fate of this compound in the soil. Thus, the objective of the study was to evaluate the interactions of the potassium ion (K+), applied via vinasse in a soil representative of the sugarcane zone of the State of Pernambuco using adsorption isotherms. The methodology was based on physical, chemical and soil mineralogical characterization, as well as equilibrium batch tests, where the experimental curves were fitted by Langmuir and Freundlich isotherm models. The results allowed to infer that the Freundlich model showed better fit of the curve in both forms: linear and non-linear (direct fit); the non-linear model was selected due to the values of coefficient of determination (R²). The interaction between potassium and soil occurred mainly with organic matter and the presence of soil kaolinite, because they showed negative ions on the external surface, thereby promoting potassium adsorption. Soil potassium adsorption capacity was higher for the first layer (0-20 cm) and decreased along the depth profile.
酒糟是甘蔗汁蒸馏制糖和酒精过程中的副产品。由于它富含营养物质，主要是钾（K），因此被用作肥料并通过滴灌施肥，而不考虑这种化合物在土壤中的归宿。因此，本研究的目的是使用吸附等温线评估通过酒糟在伯南布哥州甘蔗种植区代表性土壤中施用的钾离子（K+）的相互作用。该方法基于物理、化学和土壤矿物学特征，以及平衡批量试验，其中实验曲线通过朗缪尔和弗伦德利希等温线模型进行拟合。结果表明，弗伦德利希模型在两种形式下（线性和非线性（直接拟合））均显示出更好的曲线拟合度；由于决定系数（R²）的值，选择了非线性模型。钾与土壤之间的相互作用主要发生在有机质和土壤高岭石存在的情况下，因为它们在外表面显示出负离子，从而促进了钾的吸附。土壤钾吸附能力在第一层（0 - 20厘米）较高，并沿深度剖面降低。
