Synergistic bromothymol blue dye degradation with hydrodynamic cavitation and hydrogen peroxide (HC-H2O2)

Abstract This study assessed the degradation of bromothymol blue in a Venturi device based on a hybrid process that combines hydrodynamic cavitation (HC) and hydrogen peroxide (H2O2). A Rotatable Central Composite Design (RCCD) was used to optimize the following variables: pressure, reaction time and molar ratio of hydrogen peroxide. Degradation efficiencies were evaluated based on Chemical Oxygen Demand (COD) and color removals before and after Venturi treatment. Maximum COD (93.42%) and color (93.28%) removals were observed at 4.0 bar inlet pressure, at a treatment time of 25 minutes and at H2O2/effluent (dye) molar ratio of 30:1. The hydrodynamic cavitation/hydrogen peroxide system has great potential to remove normally recalcitrant organic pollutants.

摘要 本研究针对结合水力空化（hydrodynamic cavitation, HC）与过氧化氢（hydrogen peroxide, H₂O₂）的复合工艺，在文丘里装置（Venturi device）中评估了溴百里酚蓝（bromothymol blue）的降解效果。本研究采用旋转中心复合设计（Rotatable Central Composite Design, RCCD）对入口压力、反应时长及过氧化氢摩尔比三类变量进行优化。以化学需氧量（Chemical Oxygen Demand, COD）去除率与脱色率为评价指标，对文丘里处理前后的降解效能进行评估。当入口压力为4.0 bar、处理时长25分钟、过氧化氢/废水（染料）摩尔比为30:1时，可获得最高的COD去除率（93.42%）与脱色率（93.28%）。该水力空化/过氧化氢复合体系在去除常规难降解有机污染物方面具备极佳的应用潜力。