Jung Kyung-Won, Park Dae-Seon, Hwang Min-Jin, Ahn Kyu-Hong
Center for Water Resources Cycle Research, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul 130-650, South Korea.
Center for Water Resources Cycle Research, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul 130-650, South Korea.
Ultrason Sonochem. 2015 Sep;26:22-29. doi: 10.1016/j.ultsonch.2015.02.010. Epub 2015 Mar 4.
In this study, the decolorization of Acid Orange 7 (AO-7) with intensified performance was obtained using hydrodynamic cavitation (HC) combined with an electric field (graphite electrodes). As a preliminary step, various HC systems were compared in terms of decolorization, and, among them, the electric field-assisted modified orifice plate HC (EFM-HC) system exhibited perfect decolorization performance within 40 min of reaction time. Interestingly, when H2O2 was injected into the EFM-HC system as an additional oxidant, the reactor performance gradually decreased as the dosing ratio increased; thus, the remaining experiments were performed without H2O2. Subsequently, an optimization process was conducted using response surface methodology with a Box-Behnken design. The inlet pressure, initial pH, applied voltage, and reaction time were chosen as operational key factors, while decolorization was selected as the response variable. The overall performance revealed that the selected parameters were either slightly interdependent, or had significant interactive effects on the decolorization. In the verification test, complete decolorization was observed under statistically optimized conditions. This study suggests that EFM-HC is a useful method for pretreatment of dye wastewater with positive economic and commercial benefits.
在本研究中，采用水力空化（HC）与电场（石墨电极）相结合的方法实现了酸性橙7（AO - 7）的强化脱色。作为初步步骤，对各种HC系统的脱色效果进行了比较，其中，电场辅助改性孔板HC（EFM - HC）系统在40分钟的反应时间内表现出了完美的脱色性能。有趣的是，当向EFM - HC系统中注入H2O2作为额外的氧化剂时，随着投加比例的增加，反应器性能逐渐下降；因此，后续实验未添加H2O2进行。随后，采用Box - Behnken设计的响应面法进行了优化过程。选择入口压力、初始pH值、施加电压和反应时间作为操作关键因素，而脱色率则作为响应变量。整体性能表明，所选参数要么相互依赖性较小，要么对脱色具有显著的交互作用。在验证试验中，在统计优化的条件下观察到了完全脱色。本研究表明，EFM - HC是一种对染料废水进行预处理的有用方法，具有积极的经济和商业效益。
