Generation Of Acid-Base By Bipolar Membrane Electrodialysis Process During Desalination Of Pesticide Containing Wastewater

The high salinity pesticide wastewater was generated during the production process of 2,6-Difluorobenzamide (DB), which would cause a severe environmental pollution problem. In this study, BP-A-C-BP style bipolar membrane electrodialysis (BMED) process was applied for the zero-liquid discharge of pesticide wastewater. The end point of BMED process, the effect of operational voltage, and initial concentration of base and acid were investigated. The membrane fouling analysis has further verified the feasibility of the BMED process on the recovery of DB from pesticide wastewater. The results indicated that when the operational voltage 30 V and initial concentration of acid and base 0.10 mol/L, 99% of Na2SO4 was removed and 97% of DB was recovered. The energy consumption and current efficiency of BMED process were 2.89 kWh/kg Na2SO4 and 79.82%, respectively. Thus, BMED was a suitable method for DB recovery and desalination of pesticide wastewater with the aim of zero discharge and resource recycling in industrial application.