不同粒径零价铁颗粒降解地下水中卤代烃的动力学研究

• Published in: Beijing da xue xue bao Vol. 54; no. 2; pp. 435 - 442
• Main Authors: Zhao, Xufei, Wei, Caijie, Zhang, Jin, Wu, Weizhong, Wang, Xiaomao, Yang, Hongwei, Xie, Yuefeng
• Format: Journal Article
• Language: Chinese
• Published: Beijing Acta Scientiarum Naturalium Universitatis Pekinenis 01.01.2018; 北京大学环境科学与工程学院,北京,100871%清华大学环境学院,北京,100084
• Subjects: Chloroform; Drinking water; Iron; Organic compounds; Tetrachloroethylene; Water treatment; 零价铁; particle size; 动力学; halogenated organic compounds; zero-valent-iron (ZVI); 卤代烃; kinetics; 粒径
• ISSN: 0479-8023
• DOI: 10.13209/j.0479-8023.2017.165

Based on the chlorinated organic compounds pollution existed in underground water of China, Zero- Valent-Iron (ZVI) technology is employed for the removal of four representative halogenated organic compounds (HOCs) (tetrachloroethylene, PCE; tricholoroethylene, TCE; tetrachlormethane, TCM; and chloroform, CT). The results indicated that the reduction rates of four target compounds, of which the initial concentration is 400 µg/L, negatively correlated with the size of Zero-Valent-Iron particles. The reduction kinetics of the targeted HOCs were all well fitted with the Pseudo-firstorder kinetics, and the ranking of obtained first order rate constants (K) among different particle sizes was K20nm>K100nm>K10µm>K100µm. Comparing K among four target HOCs, the reduction rates of chlorinated methane (CT, TCM) are higher than chlorinated ethylene (PCE, TCE), and highly chlorinated HOCs (PCE, CT) were degraded more easily than lower one (TCE, TCM). pH of aqueous solution all increased along the chlorinated compounds red