磁强化次氯酸钠氧化法处理邻硝基苯酚废水的实验研究

Treatment of o-nitro-phenol wastewater with magnetization-enhanced oxidation by NaClO solution

利用磁强化次氯酸钠氧化法对邻硝基苯酚废水进行了处理实验研究。结果表明,对于质量浓度为250mg/L、CODCr为2000mg/L、色度为150倍的100mL邻硝基苯酚废水,当次氯酸钠(2.5%)用量8mL、颗粒活性炭用量200mg、溶液pH为6.0、反应时间5min时,邻硝基苯酚的去除率达94.4%,CODCr的去除率达94.2%,色度的去除率达100%。采用外加磁场,当磁场强度为60mT时,邻硝基苯酚和CODCr达到相同的去除率,反应时间缩短了3min,显著提高了反应效率。同时对磁强化氧化法的机理进行了理论上的分析。

O-nitro-phenol wastewater contains refractory organic matters can not be degraded by conventional biological methods. In this work, o-nitro-phenol wastewater was effectively treated using magnetization-enhanced oxidation by NaClO solutions. The pollutant concentrations in wastewater were 250 mg/L o-nitro-phenol 2 000 mg/L COD Cr and 150 times color. The experimental results show that, using the method used in this work, 94.4% o-nitro-phenol, 94.2% COD Cr and 100% color can be removed at pH 6, 200 mg charcoal, 8 mL oxidizer, 5 min reaction time in 1 000 mL wastewater. The treatment can be enhanced under magnetic field. COD Cr and o-nitro-phenol removal can keep unchanged while the reaction time can be reduced to 3 min when the intensity of magnetic field was 60 mT.