Estudo da incorporação do lodo de eta em argamassa

Abstract

In the water treatment process, more precisely in the washing of filters and discharge of decanters, It is produced a residue known as sludge. This in its turn, It is still largely neglected by not being so apparent in the social and daily life of the population. In most cases, this sludge has its final disposal improper, deposited in water bodies or in vacant lots, occasioning pollution of these sites. In Caçapava do Sul, the sludge generated in the WTP is driven by gravity to the open-air drying unit of Corsan, final disposal, useless after that. The city has a limestone and grout industry, which will receive the sludge from the water treatment plant (WTP) of the city, for incorporation tests in the grout. This study had as objective to analyze the use of sludge in partial replacement and the total of the hydrated lime, the material present in the composition of the mortar as an alternative use for this waste and the minimisation of environmental impacts generated by it. Methodology consisted in carrying out analyses of the chemical elements, organic matter (M. O), pH, moisture content, particle size distribution and specific gravity the actual, in addition to the creation of bodies of evidence of mortar with dosages of sludge in the proportions of 5, 10, 15% replacement for hydrated lime. The results showed that the elements that are present in higher quantities in the sludge are aluminum oxide, iron oxide, silicon oxide and organic matter. The dose built-in of 5% in the mortar proved to be satisfactory, showing a resistance to compression equal to the sample's conventional mortar (4MPa), and values very close to the resistance to bending (1,903 MPa ) 2MPa. Therefore, according to the test of mechanical resistance, the concentration of 5% of the sludge in the grout reached the appropriate levels of resistance to be able to be used.