| Summary: | 碩士 === 元智大學 === 化學工程研究所 === 89 === Abstract
Ion-exchange resin is extensively used in treatment of industrial water, some resins which can not reuse form the waste ion-exchange resin. Then, if the radioactive or the poisonous organic compounds were absorbed in the resin, the deposition of the resin is important pollution of environments without using a proper waste-treating method. This study aims to study a wet-oxidation method to degrade the ion-exchange resin and to understand the decomposition phenomenon of the resin.
Two kinds of the resin, anion ion-exchange resins (NRW-400) and cation ion-exchange resins (NRW-100) were investigated in this study. We will employ iron(II) sulfate and copper(II) sulfate as catalysts that the operating condition are temperature was 100℃, and adding hydrogen peroxide by semi-batch method. The amount of total organic carbon(TOC) was determined by TOC analysis. The concentration in liquid and gas phases were analyzed by GC with FID and TCD detectors. Then, the operating conditions were discussed the selection of anion ion-exchange resin or cation ion-exchange resin, amount of catalysts, the bubbly problem of anion resin, flow rate of hydrogen peroxide, effect of temperature and disposing of the waste water after reaction to achieve the optimum conditions.
According experimental results, the degradation of the cation ion-exchange resin with mixture of iron(II) sulfate and copper(II) sulfate is almost up to 100 percent after the reaction of 80min. The degrading rate of the resin was increased with increasing amount of catalyst, flow rate of hydrogen peroxide, or temperature. If the organic acid (i.e. CH3COOH) was extra adding into the reaction the bubbly problem of anion ion-exchange resin was reduced. Due to the bubbly problem of anion resin the amount of catalyst for anion resin was lower lower than that of cation resin. When the acetic acid was extra adding to degrade the anion resin, the degrading percentage of total organic carbon in the liquid phase was up to 99% after the reaction time of 2 hrs.
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