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Treatment of real benzene dye intermediates wastewater by the Fenton method: characteristics and multi-response optimization

机译：Fenton法处理真苯染料中间体废水的特性及多响应优化

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Benzene dye intermediates (BDI) wastewater has caused major environmental concern due to its potential carcinogenic, teratogenic, and mutagenic effects. Treatability reports dealing with the advanced chemical oxidation of BDI are limited. In this work, the Fenton method was applied to treat the real BDI wastewater to provide a deep insight into single as well as combinative effects of the main process variables influencing the treatment performance. First, we evaluated the effects of the reaction time, initial pH, initial [H2O2] concentration, and initial [Fe2+] concentration on the Fenton oxidation efficiency of real BDI wastewater. Furthermore, based on the Box–Behnken response surface methodology (RSM), an empirical mathematical model between response values, namely the chemical oxygen demand (COD), total organic carbon (TOC), color removal efficiency, sludge iron mass ration (SIMR), and influence factors were established to evaluate the interaction effects and optimize the experimental conditions. All of the proposed models were adequate with an R2 range from 0.9561 to 0.9880. In addition, three of these factors had different effects on four studied response values. By overlaying the responses, the optimum conditions were obtained at an initial pH of 4.13, an initial [H2O2] concentration of 1.0 M, and an initial [Fe2+] concentration of 0.36 M. Verification experiments were conducted at the optimum conditions, which led to a COD removal efficiency of 85.29%, a TOC removal efficiency of 75.23%, a color removal efficiency of 99.99%, and a SIMR response of 0.39, respectively, and the results were in good agreement with the values predicted by the model. In addition, the BOD5/COD ratio was observed to increase from 0.08 to 0.49, indicating an improvement in biodegradability.
机译：苯染料中间体（BDI）废水由于其潜在的致癌，致畸和诱变作用而引起了广泛的环境关注。关于BDI的高级化学氧化的可处理性报告非常有限。在这项工作中，将Fenton方法用于处理实际的BDI废水，以深入了解影响处理性能的主要工艺变量的单一以及联合作用。首先，我们评估了反应时间，初始pH，初始[H 2 O 2 ]浓度的影响，以及初始[Fe 2 + ]浓度对实际BDI废水的Fenton氧化效率的影响。此外，基于Box–Behnken响应面方法（RSM），在响应值之间建立了经验数学模型，即化学需氧量（COD），总有机碳（TOC），除色效率，污泥铁质量比（SIMR）并建立了影响因素，以评估相互作用效果并优化实验条件。所有提出的模型都足够， R 2 范围为0.9561至0.9880。此外，这些因素中的三个对四个研究响应值有不同的影响。通过覆盖响应，在初始pH为4.13，初始[H 2 O 2 时获得了最佳条件[small]]浓度为1.0 M，初始[Fe 2 + ]浓度为0.36M。在最佳条件下进行了验证实验，从而去除了COD效率分别为85.29％，TOC去除效率为75.23％，颜色去除效率为99.99％和SIMR响应为0.39，结果与模型预测的值高度吻合。另外，BOD 5 / COD比率从0.08增加到0.49，表明生物降解能力得到改善。

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