纳米铁类芬顿催化氧化焦化废水生化出水研究

Study on Catalytic Oxidation of Biochemical Effluent of Coking Wastewater by Nano-Iron Fenton-like

以焦化废水生化出水为研究对象,通过纳米铁类Fenton氧化反应对焦化废水进行深度处理,考察了温度、pH、纳米铁用量对有机物去除的影响.结果表明,在温度30℃,pH为3.3、纳米铁用量为1g/L的优化条件下,随着时间进行有机物去除率快速增加,10min内可达41.6%,60min后逐渐达到最高70.7%.GC-MS分析表明类Fenton氧化能够降解大部分有机物,其中对含氮、氧的杂环化合物去除率最高80.9%,对烷烃类物质去除率最低43.0%.扫描电子显微镜、X射线衍射仪分析表明,反应后纳米铁中零价铁特征峰强度略有降低,但纳米铁形貌和化学成分变化不明显,类Fenton反应是有机物去除的主要机制。

Advanced treatment of biochemical effluent by nano-ironas Fenton-like oxidation reaction was studied, and biochemical effluent of coking wastewater as the object. The effects of temperature, pH, nano-iron dosage on organic matter removal were investigated. The results showed that the removal efficiency of organic matter increased rapidly, reached 41.6% at 10 min, and reached the highest of 70.7% after 60 min, when temperature, pH,nano-iron dosage was 30 ℃, 3.3 and 1 g/L respectively. By GC-MS analysis, most of the organic matter in the biochemical effluent was degraded in Fenton-like oxidation process. The removal rate of the heterocyclic compound containing N and O reached 80.9%, and the removal rate of alkane compound reached 43.0%. SEM and XRD showed that the intensity peak of zero-valent iron was slightly reduced after the reaction, but the morphology and chemical composition of iron nanoparticles were not changed obviously. The Fenton-like reaction is the main mechanism of organic removal.