Laboratory Study of Chlorinated Hydrocarbons in Drinking Water Using Fe0
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摘要: 由于氯代有机溶剂的大量使用和使用氯气对饮用水消毒, 致使四氯化碳(CT) 和四氯乙烯(PCE) 成为地下水和饮用水中常见的污染物.利用廉价铁屑对CT和PCE进行还原性脱氯, 对其动力学过程进行初步研究, 并对影响反应速率的因素进行探讨.结果表明, 零价铁对氯代烃有明显的脱氯作用, 相同氯代程度的烷烃和烯烃, 烷烃的脱氯速度快, 反应符合一级反应动力学方程, 反应是准一级反应, 反应速率受到传质速率即零价铁比表面积的影响.Abstract: Carbon tetrachloride (CT) and tetrachloroethene (PCE) are the common contaminants in groundwater and drinking water because the chlorinated solvents are used in very large quantities and chlorine is used to disinfect drinking water. This paper describs the reductive dechlorination reaction using cheap iron scrapes. It discusses its kinetic process and factors that affect reaction rate. The results show that the zero valance iron is effective to the dechlorination of chlorinated hydrocarbon and that the reaction of CT is faster than that of PCE. Reaction is pseudo first order and the reaction rate is affected by specific surface area.
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图 1 Fe0降解CT, PCE曲线
a.CT, 20~40目; b.PCE, 60~80目; c.PCE, 20~40目
Fig. 1. Degradation of CT, PCE using Fe0
表 1 储备液用水的化学成分
Table 1. Composition of water prepared solution
表 2 Fe0 (20~40目) 对不同起始质量浓度四氯乙烯的降解原溶液PCE
Table 2. Degradation of different initial concentrations using Fe0 (20~40目)
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