【作者】 雷智平；

【导师】 凌开成；

【作者基本信息】 太原理工大学 ， 化学工艺， 2003， 硕士

【摘要】 电渗析技术是一项能有效处理工业废水、适用一些特殊化工过程的膜分离技术。随着对离子交换膜的不断革新和改进，双极膜电渗析技术已成为电渗析技术发展的新的研究领域。利用双极膜与阴阳离子交换膜的组合可建立双极膜电渗析器，本实验利用该装置研究了酸性氨基酸废水的处理与回收。 本课题是在实验室范围内，应用双极膜电渗析来对低浓度(0.002mol/l)和饱和浓度(0.05mol/l)的氨基酸废水进行处理与回收研究。实验表明： (1)用双极膜电渗析技术来处理酸性氨基酸废水是可行的，不仅解决了分离低浓度和饱和浓度的氨基酸废水的问题，而且浓缩回收了具有很高实用价值的氨基酸，达到了既处理了废水又回收了有用物质的双重目的。 (2)操作电压、物料流量、进料温度和进料比等因素对双极膜电渗析技术处理氨基酸废水的过程性能有影响，其中操作电压影响最大。通过正交优化设计发现一对双极膜单程脱除最佳操作条件为：温度：26℃、进料比：5.5：1、流量：2.5 l/h、操作电压：8V。在此实验条件下，稀氨基酸的单程脱除率可达58.4％、电流效率为84.7％、耗电量为0.333kwh/m~3。太原理工大学硕士学位论文循环脱除时，当脱除率为85.4%时，电流效率为43.9%、耗电量为0.94kwh/耐。与一对普通膜电渗析循环脱除相比，脱除效果相当。 (3)在五对双极膜、操作电压为25V、流量为51爪的操作条件下，脱除60分钟后，稀氨基酸的脱除率可达88.1%、耗电量为0.87 kwh/m3。对于饱和氨基酸废水的脱除，处理215分钟后，脱除率可达79.7%、电流效率为87.2%、耗电量为6.Ogkwh/m3。 (4)在普通离子交换膜和双极膜组合、操作电压为17.5V、流量为51爪、温度为26℃下，脱除3小时后，饱和氨基酸废水的脱除率可达78.9%、耗电量为3.675 kwh/m3。此工艺可以降低双极膜能耗高的问题。 最后，通过对实验数据的分析建立了双极膜电渗析脱除氨基酸废水的传质速率模型为:dc一二二dt[E，一10In[180870+110Cl+二一)1 C更多还原

【Abstract】 Electrodialsis is a membrane separation technology by which wastewater can be treated and used to many special chemical processes. With the development of ion exchange membrane material, the bipolar membrane electrodialysis technology has already turned into a new research field. The bipolar membrane electrodialysis can be constructed by the combination of the bipolar membranes and conventional homopolar cation- and anion-exchange membranes.In the paper, the separation and recovery of the dilute and saturated amino acid wastewater (0.002mol/l and 0.05 mol/1) was studied in the laboratory. The experimental results as follows:(1) By the bipolar membrane electrodialysis ,the treatment of amino acid waster water is economical and efficient, meanwhile, the discharge of amino acid waster water and the recovery of valuable amino acid solution can be resolved.(2) The effectiveness of applied voltage, flow rate, temperature and loading concentration ratio on the bipolar membrane electrodialysis performance was investigated, in which applied voltage has a decisive influence on the treatment prosess. The conditions of one way processoperation were optimized in a pair of bipolar membrane. The best condition is as follows: temperature 26C, flow rate 2.51/h, loading concentration ratio 5.5:1 and applied voltage 8 V. Under the conditions of this process, the results showed that removal rate of amino acid, current efficiency and power consumption are 58.4%, 84.7%, 0.333kwh/m3 respectively. In comparison of a pair of conventional ion exchange membrane electrodialysis , the difference of removal effect is very little.(3)Under the conditions of applied voltage 25V, flow rate 51/h in five pairs of bipolar membranes circulation process, the results showed that removal rate of dilute amino acid, power consumption are88.1%,0.87kwh/m3 respectively after processing 60 min. For saturated amino acid wastewater, after processing 215 min, the results showed that removal rate of amino acid, current efficiency and power consumption are 79.7%, 87.2%, 6.09kwh/m respectively.(4)When applied voltage, flow rate, temperature was 17.5 V,5 1/h,26C respectively, the removal rate of saturated amino acid wastewater and power consumption were about 78.9%,3.675 kwh/m3 after processing 3 h. This method can reduce the costs of the membrane.Finally, the empirical model of mass transfer is as follows:. It was established to describe the character of electrodialysis when thewastewater of amino acid was separated.更多还原