USO DE RESÍDUOS SÓLIDOS DE ESTAÇÃO DE TRATAMENTO DE ÁGUA COMO CARGA EM CORPOS CERÂMICOS

Abstract

The aim of this study was the use of sludge generated in decanters of Water Treatment Station, through its incorporation in clay, characterizing and assessing the effects of this procedure in the manufacture of Red pottery. To achieve the purpose of the research was used mud generated in ETA of Sacavém, São Luís-MA and red clay of Imperatriz-MA. The methodology consisted of dry sludge characterization tests and dry clay by X-Ray Diffraction, X-Ray Fluorescence, Scanning Electron Microscopy, Thermogravimetric and Differential Thermal Analysis. Were incorporated 5, 10, 15, 20 and 25% of the weight of the mud in clay mass. 62 samples were made by uniaxial pressing the 40 MPa and heat treated at 950° C for 3 hours. Were determined the physical and mechanical properties of bodies through the following tests: Linear Firing Shrinkage, Water Absorption, Flexural Tensile, Apparent Porosity, Loss by Fire and Apparent Mass Specific. It was observed by chemical analysis of DRX predominant components in the form of oxides SiO2, Al2O3 and Fe2O3 correspond to approximately 91% sludge composition and clay composition 89,2%, which may have provided positive results in the processing of mixtures of mud and clay and the physicomechanical bodies of evidence. The results showed that the water absorption values varied according to the levels of the ETA apply sludge on clay and that all the bodies showed evidence of water absorption values below 25%, maximum allowed for production of ceramic bodies. It was found that the samples with the addition of up to 15% of sludge on the clay can be used for manufacture of solid bricks.