Industrial wastewater treatment for removal of small concentrations of harmful solvents is pertinent issue in many chemical and pharmaceutical industries. The present work evaluates removal of three common solvents by hydrodynamic cavitation (nominal capacity, 1m³/h). Solvent degradation of three solvents viz. octanol, dimethyl formamide and cyclohexanol was studied in the concentration range of 50-200 mg/L and for the pressure drop range of 0.5-5 bar. The vortex based cavitation device (vortex diode) was compared with that of linear flow based device (orifice). Process intensification in the form of aeration and addition oxidizing agent- hydrogen peroxide was also evaluated for synergistic effect. The vortex diode required lower pressure drop and is superior to orifice and process intensification using aeration is most effective. A reduction in TOC to the extent of 74% could be achieved for octanol (200 ppm) using aeration with cavitational yield of 1202×10⁻⁴ mg/J for vortex diode, yield ~10 times of orifice. The degradation depends on the nature of solvent and it was revealed that low values of dielectric constant (ε<10) favour degradation. The kinetics was evaluated using rate model based on per-pass degradation factor. The process techno-economic feasibility is useful in industrial wastewater treatment.

去除小浓度有害溶剂的工业废水处理是许多化学和制药行业的相关问题。目前的工作评估了通过流体动力空化（标称容量，1m ³/H）。三种溶剂的溶剂降解即。在 50-200 mg/L 的浓度范围和 0.5-5 bar 的压降范围内研究了辛醇、二甲基甲酰胺和环己醇。基于涡流的空化装置（涡流二极管）与基于线性流的装置（孔板）进行了比较。还评估了以曝气和添加氧化剂-过氧化氢形式的过程强化的协同效应。涡流二极管需要较低的压降，优于孔板，使用曝气的过程强化是最有效的。使用空化产率为 1202×10 ^{-4 的}曝气可以将辛醇 (200 ppm) 的 TOC 降低至 74%涡流二极管的 mg/J，产生约 10 倍的孔口。降解取决于溶剂的性质，并且表明低介电常数值 (ε<10) 有利于降解。使用基于每次通过降解因子的速率模型评估动力学。该工艺技术经济可行性可用于工业废水处理。