铁盐共沉淀泡沫分离法去除水中铬离子

Removal of chromium ion from water by using ferrous coprecipitation foam separation

采用铁盐共沉淀泡沫分离法对水中的铬离子去除进行了研究,考察了pH值、Fe2+/Cr(Ⅵ)摩尔比、十二烷基苯磺酸钠(LAS)浓度、气液比等因素的影响.实验结果表明:当水中的铬离子含量为8mg·L-1时,去除率可达97·1%.根据泡沫分离过程与化学反应过程在物理行为上的类似性,引入等效的化学反应常数,对采用共沉淀泡沫分离法去除水中的铬离子进行宏观动力学研究.结果表明该泡沫分离过程可等效为一级反应,结合停留时间分布测定对该过程的数学模型进行了分析讨论.

Chromium ion was separated from water by using the ferrous coprecipitation foam separation method. The influences of pH value, the molar ratio of Fe^2＋ to Cr（Ⅳ）, the concentration of a linear alkyl benzene sulfonate （LAS） and gas liquid ratio were investigated. When chromium ion concentration was 8 mg. L^-1, the coefficient of removal was 97.1%. According to the similar physical behavior of foam separation process and chemical reaction process, the equivalent chemical reaction constant was introduced, and the macroscopical dynamics of using coprecipitation foam separation to remove chromium ion from water was studied. The result indicated that the process of coprecipitation foam separation could be regarded as a first order reaction. The mathmatical model of this process combined with the determination of residence time distribution was analysed and discussed.