六氯苯污染水体的零价铁修复

Zero-valent iron remediation for Hexachlorbenzene contaminated water body

为有效控制六氯苯污染水体对生态环境的影响，分析零价铁修复HCB污染水体的可行性．探讨各影响因素的作用机制．研究结果表明：随着反应时间延长，HCB去除率增加；反应体系的最佳初始pH值范围为3～6，最佳点在4．5左右；增加零价铁的投加量有利于HCB去除率的提高，但是当投加量大于35mg后，HCB去除率增势不十分显著；反应体系的温度在20～30℃之间时对HCB去除效果影响不大．反应动力学研究表明，HCB去除速率对于HCB的物质的量浓度为一级反应，其反应速率常数K为-0．0135min^-1．该方法设备简单，易于下一步实现工业放大，是一种有较好开发前景的污染水体修复工艺．

To control the ecosystems affections of Hexachlorbenzene （HCB） contaminated water body, the feasibility of zero-valent iron treatment of HCB contaminated water body was analyzed. The mechanisms of affecting factors were investigated systematically. The results show that the HCB removal efficiency increases with the increasing reaction time and iron dosage, but increases slowly when iron dosage is more than 35 mg. Initial pH of reaction solution has significant influence on the dechlorination. It shows a higher HCB removal efficiency when initial pH is between 3 and 6 and the optimal pH is 4.5. Reaction temperature has little effect on HCB removal when it ranges from 20 to 30 ℃. HCB removal methodology follows pseudo-first-order decay kinetics. It is a promissing process for its simple process flow.