Effect of Organics Matters on Membrane Fouling in Electrodialysis Process Treating Plating Wastewater = Effect of Organics Matters on Membrane Fouling in Electrodialysis Process Treating Plating Wastewater

다국어 초록 (Multilingual Abstract)

Membrane separation can stably produce wastewater treated water, minimizing operating costs due to reduced chemical usage and automated operation. When the heavy metals in the plating wastewater are concentrated or removed by the electrodialysis process, contamination of the ion exchange membrane (IEM) occurs due to organic or inorganic substances in the plating wastewater. In this study the effect of organic materials on fouling of electrodialysis membrane was investigated. The concentration of nickel containing organic matter was 120 ± 5 mg / L of plating wastewater treated with ultrasonic at 20,000 Hz. Electrodialysis was performed at 12 V for 25 minutes and repeated 12 times. When the electrodialysis was performed for the 11th iteration, fouling occurred, and it was confirmed that the removal efficiency of nickel was drastically reduced to less than 90% and the pH rapidly increased to 6 or more. The maximum concentration of nickel in the concentration tank was 800 mg/L. The maximum concentration of nickel was 1,280 mg/L in concentration tank. After the end of the experiment, the ion exchange membrane was observed. When the organic matter was not treated, the fouling was formed on the surface of the ion exchange membrane. When the organic matter was treated, the fouling was not formed on the ion exchange membrane surface. The elemental composition obtained from the SEM-EDS analysis of the fouled membrane showed that the major elements of the contaminants were C, O and Ni²⁺.