铝板电絮凝法去除重金属离子Cr(Ⅵ)的研究

Research on the removal of heavy metal ion Cr(Ⅵ)by aluminum electrode plate electro-coagulation process

拟遭受突发性铬污染的水体为研究对象,采用铝电极板电絮凝法去除水中Cr(Ⅵ),考察电流密度、反应时间、溶液初始p H等操作参数对重金属离子Cr(Ⅵ)去除效果的影响,在最佳工况条件下,Cr(Ⅵ)的去除率达到99.99%以上。在模拟废水中投加4.0 mg/L十六烷基三甲基溴化铵(CTAB),与不投加CTAB过程相比,反应时间同样为20 min,电流效率从104.7%上升到121.0%,去除率从84.56%上升到99.99%。两个反应过程均符合一级动力学模型。絮体SEM表征显示添加CTAB使絮体更加密实。

Taking the simulated water body which was contaminated suddenly by Cr as the research target, aluminum electrode plate electro-coagulation process has been used for the removal of Cr （ Ⅵ ） from water. The influences of operating parameters, such as current density, reaction time and initial pH of the solution, etc. on the removal effect on heavy metal Cr（ Ⅵ ） ions are investigated. Under optimum working conditions ,the Cr（ Ⅵ ） removing rate can be above 99.99%. Comparing the simulated wastewater to which hexadecyl trimethyl ammonium bromide （CTAB） （4.0 mg/L） was added to the simulated wastewater to which CTAB was not added,when both of their reaction time are 20 min,and current efficiency increases from 104.7% to 121.0% ,the removing rate raises from 84.56% to 99.99%. Both of the two reactions processes comply with the first order of kinetics model. The floc SEM characterization shows that the addition of CTAB makes the floc more compact.