电解法回收胶团强化超滤(MEUF)浓缩液中的Cd2+

胶团强化超滤是基于表面活性剂的双亲分子结构特性去除水中金属离子的新方法.重金属离子废水经胶团强化超滤处理后的浓缩液中含有高浓度的重金属离子,需进一步处理.采用电解法回收胶团强化超滤浓缩液中的Cd2+,考察了电极种类、电压、电解时间、pH、SDS与Cd2+浓度比等5个条件对电解效率的影响.研究发现,表面活性剂对电解有一定的阻化作用.实验得到最佳条件为:不锈钢(阳极)-石墨(阴极),U为2.8 V,电解时间为100 min,pH为4,SDS]/Cd2+]=5(SDS]=8.5 mmol/L恒定).在此条件下,浓缩液中的Cd2+的回收率达到了50.26%.

Recovery of Cd2+ by an Electrolytic Process from the Concentrated Solution of Micellar Enhanced Ultrafiltration

Micellar enhanced ultrafiltration(MEUF) is a new method which is based on the surfactant of the unique characteristic of parental molecular structure that can remove heavy metals in the water. The concentrated solution by dealing with the MEUF contains high concentration of heavy metal ions, so it must be need for further processing. The electrolysis method was employed to recovery Cd~(2+) from the concentrated solution of micellar enhanced ultrafiltration(MEUF) .Effects of type of electrode, electrolysis voltage( U) and time( t) .solution pH, surfactant to Cd~(2+) molar ratio (SDS]/Cd~(2+)]) on Cd recovery efficiency were investigated. The study found that the surfactant had some effect of resistance to electrolysis process. The optimum experimental conditions were obtained: stainless steel (anode)-graphite (cathode) , U = 2.8 V, t = 100 min,pH = 4, SDS]/Cd~(2+)] = 5(SDS] =8.5 mmol/L constant) .And the recovery efficiency of Cd~(2+) in the concentrated solution was 50.26%.