O uso do carvão ativado para tratamento da água cinza.

Abstract

The rational use of water has been the subject of pertinent discussions in educational environments where methodologies for treatment and reuse of domestic waters are sought for various purposes, contributing to the formation of a society aware of the need to preserve this mineral good. The use of biomass as an adsorbent material for the decontamination of residential effluents, such as water resulting from washing clothes, is an interesting alternative. In this sense, activated carbon is a material that has excellent adsorption characteristics, low cost and can be synthesized from biomass, abundant in the Brazilian semiarid. In this work, activated charcoal was used to remove the soap from a laboratory-prepared, defined concentration aqueous solution to simulate the usual concentration of soap in a washing machine with a capacity of 8 kg of clothes. Organoleptic properties such as color and touch showed that the filtration was efficient, it was also noticed that the filtrate did not emulsify after vigorous stirring. Conductivity measurements showed a significant decrease in the conductivity of the solution after filtration, since the soap is an organic salt and its removal leads to greater resistance of the passage of electric current in the medium. Solution hardness measurements were performed before and after filtration, the results indicated a decrease in hardness indices in the water supplied by the Paraíba Water and Sewerage Company, representing an interesting alternative for industrial reuse, since for this purpose, Low hardness has numerous advantages in synthesis processes.