采用零价铁(ZVI)还原地下水中的三氯乙烯(TCE)污染,研究了铁柱长期运行期间pH值及TCE去除率的变化,并对铁粉表面覆盖物进行了SEM,EDS及Roman光谱分析.实验结果表明:随着运行时间的持续增加,处理水pH值不断升高;在运行末期出水的TCE浓度最小值为0.35 mg/L,TCE去除率最大值为93%;铁粉表面有少量沉淀覆盖,沉淀物为铁的氧化物及碳酸钙,尚未对ZVI与TCE的反应产生抑制作用.%ZVI was used to reduce TCE pollution in groundwater.The change of pH value and the removal rate of TCE of iron column during long-term operation were studied, and the coatings on the surface of iron powder were investigated by SEM, EDS and Roman spectrum.The experimental results showed that with the extension of running time, the pH of effluents increased, in the late running the minimum TCE concentration was 0.35 mg/L, TCE removal rate was as high as 93% and a small amount of precipitations formed on iron powder surface.These precipitations were iron oxides and calcium carbonate which had not inhibited the reaction between ZVI and TCE.
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