Abstract In this study, the fluidized-bed Fenton (FBF) process was evaluated as a tertiary treatment of the second effluent from a nitro-aromatic industrial wastewater treatment plant. The soluble iron removal performances of four carriers, including quartz sand, construction sand, activated carbon, and zeolite, were examined. For the carriers, the results showed that a large surface area was available for the iron removal due to the heterogeneous nucleation, while a smooth surface contained less mesoporous seemed favorable for the consecutive iron removal because of the brittle iron oxide thickness and wash off effect. The essential variables for analysis include the initial pH and the molar ratio of [Fe2+]/[H2O2]. The results showed that the COD and SUVA254 removal efficiencies, including the utilization ratio of H2O2 on COD removal, had little difference with the increase of initial pH, suggesting that the adaptive pH range of FBF can extend from 2.5 to 7.4. However, high pH caused iron removal via homogeneous nucleation not by heterogeneous nucleation, resulting in the reduction. Under the sufficient H2O2 addition, the removal performances improved when the molar ratio of [Fe2+]/[H2O2] increased to 0.625, but a high iron addition led to a negative effect on iron removal due to the resolvable phenomenon by excess H2O2. An actual engineering project illustrated that FBF progress was a useful and cost-effective method for tertiary treatment.

中文翻译：

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流化床芬顿作为硝基芳烃工业废水三级处理的实施

摘要 在这项研究中，流化床芬顿 (FBF) 工艺被评估为硝基芳烃工业废水处理厂第二次出水的三级处理。考察了石英砂、建筑砂、活性炭和沸石四种载体的可溶性铁去除性能。对于载体，结果表明，由于异质成核，大表面积可用于除铁，而含有较少介孔的光滑表面似乎有利于连续除铁，因为氧化铁的厚度和冲刷作用较脆。分析的基本变量包括初始 pH 值和 [Fe2+]/[H2O2] 的摩尔比。结果表明，COD和SUVA254的去除效率，包括H2O2对COD去除的利用率，随初始 pH 的增加变化不大，说明 FBF 的适应 pH 范围可以从 2.5 扩大到 7.4。然而，高 pH 值导致通过均相成核而非异相成核去除铁，从而导致还原。在足够的 H2O2 添加下，当 [Fe2+]/[H2O2] 的摩尔比增加到 0.625 时，去除性能有所提高，但由于过量的 H2O2 可分解现象，高铁添加导致对除铁产生负面影响。一个实际的工程项目表明 FBF 进展是一种有用且具有成本效益的三级处理方法。在足够的 H2O2 添加下，当 [Fe2+]/[H2O2] 的摩尔比增加到 0.625 时，去除性能有所提高，但由于过量的 H2O2 可分解现象，高铁添加导致对除铁产生负面影响。一个实际的工程项目表明 FBF 进展是一种有用且具有成本效益的三级处理方法。在足够的 H2O2 添加下，当 [Fe2+]/[H2O2] 的摩尔比增加到 0.625 时，去除性能有所提高，但由于过量的 H2O2 可分解现象，高铁添加导致对除铁产生负面影响。一个实际的工程项目表明 FBF 进展是一种有用且具有成本效益的三级处理方法。