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Electro-activated Persulfate Oxidation of Biodiesel Wastewater Following Acidification Phase: Optimization of Process Parameters Using Box–Behnken Design
Water, Air, & Soil Pollution ( IF 2.9 ) Pub Date : 2021-01-04 , DOI: 10.1007/s11270-020-04962-8
Senem Yazici Guvenc , Gamze Varank , Aleyna Cebi , Bestami Ozkaya

High volumes of wastewater with high pollutant concentration form in the transesterification stage of the process applied for biodiesel production from waste vegetable oils. In this study, application of the advanced electrocoagulation process following acidification was investigated in the biodiesel wastewater treatment. Through the acidification step of the sequential process, respectively, 25.4%, 68.7%, and 50.0% removal efficiencies for COD, oil-grease, and volatile fatty acids (VFAs) were obtained. Electro-activated persulfate (EAP) oxidation was modeled and optimized by using the response surface methodology and Box–Behnken design. The effect of independent variables (current, persulfate/COD ratio, time) on COD, oil-grease, VFAs removal, and total cost and the interaction of the variables of the process were determined. The maximum oil-grease removal efficiency predicted by using the model was 98.3% under the optimum conditions (current: 4 A, persulfate/COD: 4.4, and time: 15 min), whereas oil-grease removal efficiency obtained by the verification experiments performed at optimum conditions was found to be 97.2%. Sequential acidification–EAP process is an appropriate treatment method for biodiesel wastewater with high oil-grease concentration, and response surface methodology is a powerful tool for optimizing the operational conditions of EAP oxidation for COD, oil-grease, VFAs removal, and total cost.

Graphical abstract



中文翻译:

酸化阶段后生物柴油废水的电活化过硫酸盐氧化:采用Box–Behnken设计优化工艺参数

在从废植物油生产生物柴油的过程的酯交换阶段,形成了高浓度高浓度废水。在这项研究中,研究了酸化后先进电凝工艺在生物柴油废水处理中的应用。通过顺序过程的酸化步骤,分别获得了25.4%,68.7%和50.0%的COD,油脂和挥发性脂肪酸(VFA)去除效率。通过使用响应面方法和Box–Behnken设计对电活化过硫酸盐(EAP)的氧化进行建模和优化。确定了独立变量(电流,过硫酸盐/ COD比率,时间)对COD,油脂,VFA去除和总成本的影响以及该过程变量之间的相互作用。在最佳条件下(电流:4 A,过硫酸盐/COD:4.4,时间:15分钟),使用该模型预测的最大油脂去除效率为98.3%,而通过验证实验获得的油脂去除效率则为发现在最佳条件下为97.2%。顺序酸化– EAP工艺是处理油脂含量高的生物柴油废水的合适方法,而响应面法则是优化EAP氧化操作条件(COD,油脂,VFA去除和总成本)的有力工具。而在最佳条件下进行的验证实验获得的去除油脂的效率为97.2%。顺序酸化– EAP工艺是处理油脂含量高的生物柴油废水的合适方法,而响应面法则是优化EAP氧化操作条件(COD,油脂,VFA去除和总成本)的有力工具。而在最佳条件下进行的验证实验获得的去除油脂的效率为97.2%。顺序酸化– EAP工艺是处理油脂含量高的生物柴油废水的合适方法,而响应面法则是优化EAP氧化操作条件(COD,油脂,VFA去除和总成本)的有力工具。

图形概要

更新日期:2021-01-04
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