Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, China E-mail:
Water Sci Technol. 2022 Mar;85(6):1904-1919. doi: 10.2166/wst.2022.051.
In this study, six strains of microbial agents were investigated as environmently friendly scale and corrosion inhibitors for industrial cooling water applications. The static jar tests along with characterization methods were applied to evaluate the scale inhibition performance. Results showed that under a concentration of 240 mg/L, the nitrobacteria, denitrobacteria and Lactobacillus agents reached high CaCO scale inhibition efficiencies of 83, 82, and 86% respectively. Characterization methods indicated the deposited crystals morphologies were modified and the crystals peak intensities were lowered. In addition, weight loss measurements, electrochemical measurements, surface characterization analyses were conducted to study the corrosion inhibition performances and mechanisms. It was found that at 40 °C, Bacillus cereus agent with 200 mg/L possessed the highest corrosion inhibition efficiency of 60.11% at 3 d, together with the second-lowest current density of 13.0 μA cm at 12 d. The corrosion inhibition mechanisms were attributed to biofilm accumulation and biomineralization on Q235 CS surfaces to form protective film. The results suggested microbial agents have promising potential as environmently friendly scale and corrosion inhibitors for industrial cooling water applications.
在这项研究中，研究了六种微生物制剂作为工业冷却水应用的环保型阻垢和缓蚀剂。通过静态釜试验和特征化方法评估了阻垢性能。结果表明，在 240mg/L 的浓度下，硝化细菌、反硝化细菌和乳酸菌制剂对碳酸钙的阻垢效率分别达到了 83%、82%和 86%。特征化方法表明，沉积晶体的形态得到了修饰，晶体的峰值强度降低了。此外，还进行了失重测量、电化学测量、表面特征分析，以研究缓蚀性能和机制。结果发现，在 40°C 下，浓度为 200mg/L 的蜡状芽孢杆菌制剂在 3 天内具有最高的 60.11%的腐蚀抑制效率，在 12 天内的电流密度也最低，为 13.0μA/cm。缓蚀机制归因于 Q235CS 表面生物膜的积累和生物矿化，形成了保护性薄膜。结果表明，微生物制剂作为工业冷却水应用的环保型阻垢和缓蚀剂具有广阔的应用前景。
