多维电极法去除水中溶解态腐殖酸的机理探讨

腐殖酸被认为是氯消毒副产物（DBPs)的主要前驱物，为了寻求有效、经济的控制DBPs的手段，采用了活性碳多维电极法，讨论了溶液pH,Ca^2 浓度和外电压影响去除效果的机理，并对多维电极吸附与单纯活性碳吸附进行了比较。研究结果表明，多维电极对腐殖酸的吸附过程符合修正的Freundlich模型：x/m＝Kf(C/D)^1/n，模型中的常数Kf和1／n均小于单纯活性碳吸附时的相应常数。联系到pH,C^2 浓度和外电动对去除效果的影响，可以认为静电引力是强化活性碳多维电极吸附溶解态腐殖酸的主要作用力。电子显微镜检测显示，在运行同样时间后，作为多维电极的活性碳的微观结构较单纯吸附时的活性碳疏松，说明该方法有可能延长活性碳的使用寿命。

Mechanism of Removing Dissolved Humic Acids from Drinking Water by Multi-electrodes of Granular Activated Carbon

A batch reactor with multi electrodes of granular activated carbon(GAC) was used to remove humic acids ( HAs) from drinking water. The results showed that pH value, lower Ca 2 concentration in water and higher supplied voltage accelerated the removal of HAs. The adsorption of HAs by charged GAC was in agreement with the revised Freundlich model : x/m=K f(Ce/D) 1/n . The constants of the model, K f and 1/n , were less than that in the adsorption process with GAC only .It was proposed that static graviation was the main force to strongthen the adsorption of HAs to charged GAC .The examination by electron microscope showed that the micro structure of charged GAC was more porous than that of GAC when both of them were used to remove HAs for twenty hours. This meant that the charged GAC was regenerated in part .