摘要
由于重金属离子具有高毒性和难降解的特性,对人体和生物体的健康造成严重影响.因此,如何有效的去除废水中重金属离子具有重要的研究意义和实际应用价值.将煤基导电炭膜与电场相结合构建重金属处理系统分离去除废水的重金属镍离子,分别考察了溶液初始浓度、蠕动泵转速、电场强度、溶液pH值等因素对系统处理效果的影响及其原因,确定了煤基炭膜处理重金属镍离子的临界电场强度.结果显示,溶液的初始浓度会对系统的处理效果有明显影响影响,处理系统对低浓度镍离子废水的处理效果要优于高浓度的含镍废水;蠕动泵的转速影响炭膜的渗透通量,转速越大,膜渗透通量越大;在电场的作用下,导电炭膜的渗透通量和重金属离子的去除效率有了明显提高,处理系统对含镍废水处理所需的临界场强是0.4 V/cm;含镍废水的pH控制在5左右处理效果较好.
Heavy metalionscan do harm to the health of both human and organismsdue to itshigh toxicity anddifficulty at degradatioa Therefore,it is of great importance for us to removal it from environment In this paper,a wastewater treatment system was designed which combinesthe conductive carbon membranes with electric field used for the removal of heavy metals nickel ions.The effects of initial concentration of solution,rotational speed of peristaltic pump,electric field intensity and pH value of solution on the performance of membrane separation were discussed and the critical electric field intensity of the treatment system was determined finally.The results showed that the concentration of solution can have influence on its performance and it has a better treatment performance at low concentration than at high concentratioa The speed of peristaltic pump has influence on the permeate flux,and the permeate flux increased with the increase of the speed of peristaltic pump.The results also showed that electric field can improve the separation performance of carbon membrane,both permeate flux and removal efficiency increase with electric field and the critical field strength is 0.4 V/cm.InitialpH of 5.0 is more suitable for the removal of nickel ions from the wastewater.
引文
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