Sonochemical oxidation activity may be significantly enhanced by optimizing the geometric factors of a sonoreactor and implementing additional physical actions, such as mechanical mixing and gas sparging. This study investigates the effects of liquid recirculation flow on sonochemical oxidation reactions. This was carried out through experimental testing with a 28 kHz bath-type sonoreactor under various liquid heights and flow rates, ranging from 1λ to 4.0λ and 1.5–6.0 L/min, respectively. The potassium iodide (KI) dosimetry and sonochemiluminescence methods were used in the experiment. With an increase in the liquid height/volume, the pseudo zero-order kinetic constant and the mass of triiodide (I₃⁻) ions fluctuated. The optimal liquid height was 2.0λ, 2.5λ, and 3.0λ, based on the appropriate formation of a cavitation active zone in the reactor. The introduction of a liquid recirculation flow led to a large reduction in sonochemical activity due to the shrinkage of the cavitation active zone. However, the sonochemical activity increased at higher flow rates through the capture of ultrasonic energy at the bottom zone. This increase was attributed to the formation of a strong and expanded active zone limited to the reactor bottom to the height of the recirculation flow. The results demonstrate that applying a high rate liquid flow adjacent to the transducer module may be beneficial for enhanced sonochemical activity.

通过优化声反应器的几何因素和实施额外的物理动作，如机械混合和气体喷射，可以显着提高声化学氧化活性。本研究调查了液体再循环流对声化学氧化反应的影响。这是通过使用 28 kHz 浴式声纳反应器在不同液体高度和流速（分别为 1λ 至 4.0λ 和 1.5-6.0 L/min 的范围内）下进行的实验测试来进行的。实验中采用碘化钾（KI）剂量测定法和声化学发光法。随着液体高度/体积的增加，伪零级动力学常数和三碘化物的质量 (I ₃ ^-) 离子波动。基于反应器中空化活性区的适当形成，最佳液体高度为2.0λ、2.5λ和3.0λ。由于空化活性区的收缩，液体再循环流的引入导致声化学活性的大量降低。然而，通过在底部区域捕获超声波能量，声化学活性在更高的流速下增加。这种增加归因于形成了一个强大的和扩展的活性区，该区限于反应器底部到再循环流的高度。结果表明，在换能器模块附近施加高速液体流可能有益于增强声化学活性。