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首页> 外文期刊>Environmental Science & Technology >A Novel Electro-Fenton Process for Water Treatment: Reaction-controlled pH Adjustment and Performance Assessment
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A Novel Electro-Fenton Process for Water Treatment: Reaction-controlled pH Adjustment and Performance Assessment

机译：一种新型的电子芬顿水处理工艺：反应控制的pH调节和性能评估

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摘要

A novel electro-Fenton (E-Fenton) process was developed, in which the desired pH for an effective E-Fenton reaction and for a neutral treated media could be obtained by utilizing the reaction-released H~+ and OH~- in stead of chemical addition. In the laboratory-scale process using three chambers, the substrate solution pH > 4.0 was designed to be adjusted in situ through three sequencing steps: (Ⅰ) pH reduction, (Ⅱ) pH keeping for the effective E-Fenton reaction, and (Ⅲ) pH recovery to neutral while the E-Fenton reaction continued. Experimental results demonstrated that such three-step pH adjustmentwas successfully achieved in this novel E-Fenton process, and that the pH adjustment was controlled by the E-Fenton reaction process. The performance of the novel process was assessed in terms of dimethyl phthalate (DMP) degradation in aqueous solution. The results revealed that the novel process was effective to reduce the DMP concentration and the total organic carbon (TOC) at steps Ⅱ and Ⅲ. Also, through experiments, the initial DMP solution pH > 4.0 was selected to be reduced to 3.5 in Step Ⅰ of the process. This pH adjustment not only allowed the E-Fenton reaction to occur in its favorable pH range, but also benefited any potential subsequent biological treatment process or a final discharge. Moreover, the iron species could be recycled in the process.
机译：开发了一种新颖的电子芬顿（E-Fenton）工艺，其中可以有效地利用反应释放的H〜+和OH〜-来获得有效的E-Fenton反应和中性处理的介质所需的pH值化学添加物。在使用三个腔室的实验室规模的过程中，将底物溶液的pH> 4.0设计为通过三个测序步骤进行原位调节：（Ⅰ）降低pH，（Ⅱ）保持有效E-Fenton反应的pH和（Ⅲ）在E-Fenton反应继续进行的同时，pH恢复至中性。实验结果表明，在这种新颖的E-Fenton方法中成功地实现了这种三步式pH调节，并且pH调节通过E-Fenton反应过程来控制。根据邻苯二甲酸二甲酯（DMP）在水溶液中的降解来评估新方法的性能。结果表明，该新工艺可有效降低步骤Ⅱ和Ⅲ中的DMP浓度和总有机碳（TOC）。此外，通过实验，在该方法的步骤Ⅰ中选择初始DMP溶液的pH> 4.0降低到3.5。这种pH调节不仅允许E-Fenton反应在其有利的pH范围内发生，而且有益于任何潜在的后续生物处理过程或最终排放。此外，可以在此过程中回收铁物种。

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