Use of WTP sludge in clay for ceramic brick production

Water treatment plants transform raw water into drinking water for human consumption. During this purification process, a solid waste product called sludge is generated. It is self-degrading and can have a negative impact if released into the environment in its natural state. This book describes the potential use of WTP sludge by incorporating it into clay for making ceramic bricks. Laboratory tests were carried out with proportions of 0%, 12%, 15% and 20% of waste incorporated into the clay mix, the results of which could influence the physical and mechanical properties of the ceramic material. The specimens underwent physical and mechanical tests to assess the quality of the final product by analysing the properties of linear shrinkage, water absorption, apparent porosity, apparent specific mass and flexural tensile strength. By comparing the results with the parameters established in NBR 15270-1, 2 and 3/2005, it was proved that WTP sludge can be incorporated up to 20% into clay for brick manufacture. This is an alternative environmentally correct way of disposing of this waste: WTP sludge.