Optimizations of inhibitors compounding and applied conditions in simulated circulating cooling water system

• Published in: Desalination 2013-03, Vol.313, p.18-27
• Main Authors: Liu, Fang, Lu, Xianhui, Yang, Wei, Lu, Jinjin, Zhong, Huiyun, Chang, Xin, Zhao, Chaocheng
• Format: Article
• Language: English
• Subjects: Applied sciences; Bactericidal efficiency; Bicarbonates; Circulating; Cooling systems; Corrosion; Corrosion inhibition efficiency; Corrosion inhibitors; Exact sciences and technology; Inhibition; Inhibitor compound; OAD; Optimization; Pollution; Scale (corrosion); Scale inhibition efficiency
• ISSN: 0011-9164; 1873-4464
• DOI: 10.1016/j.desal.2012.11.028

Scaling, corrosion and biofouling are three main problems in circulating cooling water system. These problems occur simultaneously and have great economic impacts. This study has been carried out to develop the inhibitor compounds for mitigating scaling, corrosion and biofouling simultaneously. The monomer inhibitors, such as sodium of polyaspartic acid (PASP), amino trimethylene phosphonic acid (ATMP) and benzyldimethyltetradecylammonium chloride (BDTAC), were first investigated to obtain the appropriate concentration ranges. Orthogonal array design (OAD) was used for achieving the optimal composition of the inhibitor compound. The applied conditions of inhibitor compound, such as pH, temperature, calcium ion and bicarbonate radical were also optimized. The results indicated that the optimal composition of inhibitor compound consisted of 40mg/L ATMP, 20mg/L PASP, 80mg/L BDTAC and 2mg/L zinc salt. The performances of the inhibitor compound were superior to the single inhibitors separately, which suggested that there had a synergistic effect among the inhibitors. The inhibitor compound had good performances of corrosion inhibition, scale inhibition and bactericidal action at the pH and temperature ranges of 6.5–9 and 30–70°C, respectively. The inhibitor compound had the wider tolerance of calcium ion and bicarbonate radical. [Display omitted] ► Inhibitor compound was consisted of ATMP, PASP, BDTAC and zinc salt. ► Performances of inhibitor compound were superior to single inhibitors separately. ► Inhibitor compound has good performances at pH of 6.5–9 and temperature of 30–70°C. ► Inhibitor compound has the wider tolerance of calcium ion and bicarbonate radical.