Corresponding Author

Xin-sheng ZHANG(xszhang@ecust.edu.cn)


Large amount of organic saline wastewater is generated from various chemical industries. The contents of organic saline wastewater are more and more complicated as they are created from different types of industries. Directly discharging the organic saline wastewater without pre-treatment can generate severe environmental problem and waste useful resources. It is necessary to use an economical method to treat the organic saline wastewater and recover the salt into useful materials to achieve resource reuse. Bipolar-membrane electrodialysis (BMED) is one of the methods that can remove salt from the wastewater and convert it into certain acid and base with higher value than salt. After BMED process, the organicsleft in the treated wastewater can be further removed by normal methods. This research focuses on treating an industrial saline perfume wastewater, which contains high contents of NaCl and organic compounds, with BMED method. The purpose is to reduce the NaCl concentration and convert it into high valued acid and base with high concentrations. When 3 liters of wastewater were treated, the processing time is guaranteed. The concentrations of recovered acid and base were 1.93 mol·L-1 and 1.70 mol·L-1, respectively. The desalination rate reached 99.4%, and current efficient and electricity consumption were 30.7% and 2.58 kW·h·kg-1, respectively. By adding waste water raw material and NaCl solid in the salt compartment, the reduction of NaCl concentration in salt compartment could be inhibited, and the concentration of NaOH was increased significantly, and the degree of the latter became more obvious. For cathodic exchange membranes, their ability to prevent Cl- penetration decreased as following order: JCM-II>N2030>TRJCM. For anodic exchange membranes, JAM-II had better Na+ penetration preventing ability than TRJAM. JCM-II had lower membrane resistance, so that it consumed less electrical energy than N2030. Overall, a combination of JAM-II/BPM-I/JAM-II membranes showed the best performance and least electricity consumption.

Graphical Abstract


bipolar-membrane electrodialysis, high saline content perfume wastewater, desalination rate, salt concentration

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