In this paper, the decomposition of Rhodamine B (RhB) by hydrodynamic cavitation (HC), acoustic cavitation (AC) and the combination of these individual methods (HAC) have been investigated. The degradation of 20 L RhB aqueous solution was carried out in a self-designed HAC reactor, where hydrodynamic cavitation and acoustic cavitation could take place in the same space simultaneously. The effects of initial concentration, inlet pressure, solution temperature and ultrasonic power were studied and discussed. Obvious synergies were found in the HAC process. The combined method achieved the best conversion, and the synergistic effect in HAC was even up to 119% with the ultrasonic power of 220 W in a treatment time of 30 min. The time-independent synergistic factor based on rate constant was introduced and the maximum value reached 40% in the HAC system. Besides, the hybrid HAC method showed great superiority in energy efficiency at lower ultrasonic power (88-176 W). Therefore, HAC technology can be visualized as a promising method for wastewater treatment with good scale-up possibilities.

本文研究了通过水力空化（HC），声空化（AC）以及这些单独方法（HAC）的组合分解罗丹明B（RhB）的方法。20 L RhB水溶液的降解是在自行设计的HAC反应器中进行的，在该反应器中可以同时在同一空间内进行水力空化和声空化。研究并讨论了初始浓度，入口压力，溶液温度和超声功率的影响。在HAC流程中发现了明显的协同作用。组合方法实现了最佳转化，在30分钟的处理时间内，以220 W的超声功率，HAC中的协同效应甚至高达119％。引入了基于速率常数的时间无关的协同因子，在HAC系统中最大值达到40％。此外，混合HAC方法在较低的超声功率（88-176 W）下在能量效率方面显示出极大的优势。因此，可以将HAC技术可视化为具有良好放大可能性的有前途的废水处理方法。