A Novel Electro-Fenton Process for Water Treatment: Reaction-controlled pH Adjustment and Performance Assessment

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• 作者：Hong Liu ; Chuan Wang ; Xiangzhong Li ; Xiaoli Xuan ; Chengchun Jiang ; Hua'nan Cui
• 刊名：Environmental Science & Technology
• 出版年：2007
• 出版时间：April 15, 2007
• 年：2007
• 卷：41
• 期：8
• 页码：2937 - 2942
• 全文大小：194K
• 年卷期：v.41,no.8(April 15, 2007)
• ISSN：1520-5851

文摘

A novel electro-Fenton (E-Fenton) process was developed,in which the desired pH for an effective E-Fenton reactionand for a neutral treated media could be obtained by utilizingthe reaction-released H⁺ and OH^- in stead of chemicaladdition. In the laboratory-scale process using threechambers, the substrate solution pH > 4.0 was designedto be adjusted in situ through three sequencing steps: (I) pHreduction, (II) pH keeping for the effective E-Fentonreaction, and (III) pH recovery to neutral while the E-Fentonreaction continued. Experimental results demonstratedthat such three-step pH adjustment was successfully achievedin this novel E-Fenton process, and that the pH adjustmentwas controlled by the E-Fenton reaction process. Theperformance of the novel process was assessed in termsof dimethyl phthalate (DMP) degradation in aqueoussolution. The results revealed that the novel process waseffective to reduce the DMP concentration and thetotal organic carbon (TOC) at steps II and III. Also, throughexperiments, the initial DMP solution pH > 4.0 wasselected to be reduced to 3.5 in Step I of the process.This pH adjustment not only allowed the E-Fenton reactionto occur in its favorable pH range, but also benefitedany potential subsequent biological treatment process ora final discharge. Moreover, the iron species could be recycledin the process.