Dan Duke, Water Conservation Tech Intl
Studies were performed with coupled multielectrode array sensors (CMAS) to establish the corrosion inhibition performance of azoles corrosion inhibitors for copper and metals normally corroded by the presence of ammonia. The studies were conducted with water at high pH and high total dissolved solids (TDS) that result from the operation of an evaporative cooling tower system at zero liquid discharge (ZLD). The study compares the effect of Tolytriazole treated versus untreated water with chemistry at pH 10, low hardness (< 100 as CaCO3) and TDS of 146,000 mg/L along with the presence of silica corrosion inhibitor generated from source water. Laboratory test results will be compared with field test results in a comparably treated ZLD system where ammonia containing “grey” water is used for makeup to a cooling system with copper exchangers.