Comparação da adsorção de fósforo em solução aquosa por coluna de leito fixo utilizando cerâmica vermelha in natura e pré-ativada por solução de cal

Abstract

The usage of phosphate in fertilizers provided an intensification of agriculture making food more accessible worldwide following that advance, others products starting including this element in your composition. However, the incorrect disposal of phosphate has been the source of problems, like eutrophication of lakes and rivers. Align with the problem of the incorrect disposal of civil construction solid waste, the main generator of this type of waste. The red ceramic of pottery bricks discarded by the building industry was chosen as an alternate material on the adsorption of phosphorus from aqueous solution. Adsorption is the process of mass exchange, in which the particles of the residue dissolved in water attach to the adsorbent. Besides the experiment using ceramic in nature, it was also performed the experiment whitewash loaded ceramic. It was used 3.110 g of each material in a fixed bed column of 100 mm of diameter and 50 cm of height within a fixed flow rate for at least 180 minutes. For the kinetic study, it was done using the Thomas model in adjustment of the result obtained experiment results. The in-nature ceramic obtained a R2 of 0,8129 and it was capable of adsorbing almost 100 % of phosphorus during the first 15 minutes. The column filled with whitewash loaded ceramic obtain a R2 of 0,9297 being capable of adsorbing almost the totality during the first 30 minutes also. The comparation between both materials proved that red ceramic behaves as a good adsorbent and when loaded a greater efficiency, justifying the usage of whitewash, since that it was found a 10 hours saturation time for the first one and a 30 hours saturation for the ceramic loaded with whitewash.