零價鐵（zero valent iron，ZVI）可以有效去除偶氮染料之色度，而Fenton對於TOC有不錯的處理成效，倘若零價鐵一直存在系統中，就會有源源不絕的亞鐵提供Fenton反應，而且染料被零價鐵分解成較小的分子後，也將有利於Fenton氧化降解TOC。因此本研究將結合零價鐵與Fenton法來處理偶氮染料orange II的色度及TOC，一開始先以零價鐵處理染料，探討於不同pH值、零價鐵加入量和初始染料濃度下，色度和TOC之去除、產生亞鐵與用酸量之關係，接著比較ZVI-Fenton、Fenton、ZVI-H2O2三種不同系統對染料去除之影響。 在pH 3.0、加入愈多的零價鐵色度去除速率愈快，而擬一階反應速率常數也愈大，但是不同的初始染料濃度並不會影響反應速率常數；零價鐵處理染料60分鐘後，其TOC去除效果並不明顯；由加酸量和亞鐵產生量的比值觀察主要與零價鐵反應的物質，發現零價鐵在pH 3.0與染料作用的比例高於pH 4.0且加入的零價鐵量越多、染料初始濃度越低會不利於零價鐵的使用率，而色度去除率達90%後，系統會開始出現浮鐵現象，將不利零價鐵連續處理染料。另外，以色度和TOC去除效果來看，ZVI-Fenton的確優於Fenton系統，且零價鐵與Fenton程序最好分開於不同槽體下反應。 最後，以批次式所得之結果，規劃出連續式操作流程與條件，發現染料色度及TOC去除率分別可達95%和40%。 Azo dye can be decolorized easily by zero valent iron (ZVI), and Fenton process is effective for TOC removal. With ZVI presented in the system, supply of ferrous ions for Fenton reaction will be unlimited. After the dye is reduced into small molecules by ZVI, TOC removal of these small molecules by Fenton oxidation will be more favorable. In this study, decolorization and TOC removal of azo dye orange II by ZVI and Fenton were studied. First, we observe decolorization, TOC removal and acid added versus ferrous generated under different pH value, ZVI dosage and initial dye concentration. And then, we observe treatment effectiveness of dye removal using different systems, namely ZVI-Fenton, Fenton and ZVI-H2O2. Decolorization of dye was accelerated by ZVI under pH 3.0 and increasing ZVI dosage. Initial dye concentration did not affect the first-order reaction rate constant. TOC removal by ZVI was negligible for reaction time up to sixty minute. The ratio of acid added versus ferrous generated was used to explore the major reaction substance with ZVI. More ZVI react with dye at pH 3.0 than at pH 4.0. It is unfavorable for utilization of ZVI under higher ZVI dosage and lower initial dye concentration. Floatation of ZVI was observed when more than 90% of color was removed due to the generation of hydrogen gas. Decolorization and TOC removal by ZVI-Fenton is better than Fenton system. Meanwhile, ZVI reduction and Fenton oxidation should be employed under different reactors. Finally, based on the results of the batch reaction, we operated ZVI-Fenton process under completely mixed reactor, obtaining more than 95% and 40% of decolorization and TOC removal, respectively.