Mixture design of an environmentally friendly scale and corrosion inhibitor in reclaimed wastewater for cooling systems

Abstract

AbstractAn environmentally friendly inhibitor was designed by the mixture design method and its application in a pilot-scale cooling system with reclaimed wastewater as the makeup water was evaluated. The optimized composition of the inhibitor was 12.5% PBTCA, 21.8% ZnSO4, 18.7% PASP, 9.4% HPAA, 18.8% AA-ATMP-HPA polymer, and 18.8% HPMA. The inhibition efficiencies of carbonate scale and corrosion were 93.3 and 94.4%, respectively. The scale inhibition was due to the distorted crystal formation of the scale through the action of carboxyl and phosphonic acid groups in the inhibitor. The corrosion inhibition was attributed to the protective film formed by the adsorption of the inhibitor onto the surface of the carbon steel.