In view of the environment problems presented in the last decades, the concern with the gas emissions has been considerably intensified. The red ceramic industry searches alternative of natural raw materials preservation, the commons clays, besides benefiting production costs. A viable alternative is the incorporation of industrial wastes into clayey pastes. This also contributes to decrease the negative environmental impact by release of these wastes in the environment. However, little attention has been given the pollutant gas emissions during the firing step of the new ceramic products. In this work were prepared three clayey pastes containing 0, 15 and 100% of WTP sludge. The chemical and mineralogical compositions of the ETA sludge were determined. Ceramic pieces prepared by pressing were fired between 150 and 1100 ºC. The gas emissions released during firing were analyzed through photothermal technique. It was noted in relation the pure clayey paste, that the addition of WTP sludge provoked a significant increase of CH4 and CO2 emissions.
gases; red ceramic; WTP sludge; photothermal technique
