Effects of the partial substitution of soil by water treatment plant sludge in soil-cement bricks
Abstract
About 75% of the drinking water in Brazil is produced in conventional water treatment plants (WTPs). Residues are generated in this process, mainly the sludge from decanters (WTPS), which according to studies is released without treatment into water bodies in 68% of those facilities. This research evaluates the feasibility of adding WTPS as a partial substitute for soil in soil-cement bricks in the 1:9 (cement: soil+WTPS) mixing ratio. The waste was collected during the cleaning of the WTP decanters from Toledo-PR. The bricks were produced with 5, 10, 15, 25 and 35% of soil mass replacement by LETA, in addition to the control (0%). The moldings took place in industrial equipment to reproduce real manufacturing conditions as much as possible. With increasing sludge content, the compressive strength of the bricks was reduced. However, the Brazilian regulatory requirements were met up to the addition of 15% WTPS. There was an increase in water absorption with increasing sludge content. However, the bricks met Brazilian regulatory requirements until the 25% replacement of WTPS. In this way, incorporating up to 15% of this residue in soil-cement bricks can be a viable alternative for processes that generate more environmental impacts, such as release into bodies of water and even disposal in landfills.References
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