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水相和泥浆系统中地下水成分对高锰酸钾氧化TCE的影响

Keywords: 高锰酸钾,三氯乙烯,污染地下水,泥浆系统

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Abstract:

三氯乙烯(TCE)是污染土壤和地下水中检出率较高的氯代有机物。以TCE为研究对象,考察了地下水无机成分和腐殖酸对高锰酸钾氧化TCE的影响,研究了不同离子强度下的MnO2颗粒行为,并测定了泥浆系统中TCE的氧化效果,结果表明:当TCE初始浓度为20mg/L、高锰酸钾与TCE的摩尔比为2∶1,离子浓度<0.1mol/L时,TCE去除率可达98%以上,Na+、Cl-、HCO3-对TCE的去除率影响甚微,但离子强度对MnO2的沉淀生成影响显著;0.1mol/L的K+对TCE的去除有一定程度的抑制;0.1mmol/L的Fe2+和腐殖酸对TCE的氧化有显著负面影响。泥浆系统实验进一步验证了有机质对高锰酸钾氧化TCE的影响很大。

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