ANALYSIS OF TEMPERATURE EFFECTS IN THE SLUDGE OF THE WATER TREATMENT STATION BOLONHA (BELÉM, PA)

Abstract

The growing concern about the fate of environmental wastes has led to an increase in studies aiming at the correct destination of these wastes. Among these residues are the sludge from water treatment plants (LETA), which is dumped into bodies of water without any treatment. To apply it, it is important to know its characteristics and potentialities. Therefore, this study aims to evaluate the effects of calcination at temperatures of 600 °C, 700 °C and 800 °C in the LITA Bologna, to know its physicalchemical and mineralogical characteristics. Therefore, it was necessary to carry out X-ray diffraction, X-ray fluorescence, specific mass and laser granulometry tests in the in natura and calcined sludge. From the fluorescence, it was noticed that the LETA is composed mainly of the oxides of silicon (SiO2), aluminum (Al2O3) and iron (Fe2O3). It has been verified, through mineralogical analysis, that in the mud in natura the kaolinite is the predominant mineral but, in temperatures higher than 500 °C, there is a breakdown of its crystalline structure forming the amorphous metacaulinite, more reactive. Thus, through the results of the techniques used, it was concluded that the characteristics of the particles are important for a future application in cementitious matrix composites or geopolymers since they are rich in alumina and silica.