关键词: 甲酸, 电去离子, 特征曲线

Abstract: There is plenty of formic acid existing in wastewater discharged from industrial production. One flow passage system of electrodeionization was designed for formic acid waste-water treatment. According to “I-U” and “pH-U” characteristic curves，the influences of the ion exchange membrane types，the ion exchange resin types，the ratio of resins，the flow rates and the operational parameters on separation performance were investigated. The results show that the optimal performance could be achieved when the EDI stack consisted of heterogeneous membrane，100% gel-type anion resin filled in dilute compartment and the flow rate of dilute stream was 2.5 L/h. The concentration of formic acid has less impact on energy consumption and the change of dilute compartment solution concentration was basically the same. When the concentration of formic acid in dilute compartment was 1.00%，EDI stack could achieve higher current and lower power consumption. The study results can guide the industrial electrodeionization design for formic acid wastewater treatment.

Key words: formic acid, electrodeionization(EDI), characteristic curve