Abstract: According to the quality of the city reclaimed water used in the circulatory cooling water in the power plants, the anti-scaling synergy of PESA、PBTCA、MA-AA with calcium carbonate precipitation method were studied and the optimized compositional formulation（6 mg/L PESA +4 mg/L MA-AA +5 mg/L PBTCA）was screened out. The effects of temperature, pH, and HCO on inhibition rate in different scale inhibitors were examined. The result demonstrated that the optimized mixed formula had advantage in thermal and alkaline stability, which could be applied in circulating water system of high temperature and high pH. In addition, when the concentration of HCO increased, the inhibition rate of optimized mixed formula decreased a little. Therefore, this formula can be applied in circulating water system of high concentration of HCO.

Key words: polyepoxysuccinic acid, water treatment agent, inhibition rate, reclaimed water, circulatory cooling water