功率超声的声学参数对废水处理效果的影响

从功率超声在水处理中的空化机理入手,论述了国内外在应用功率超声进行废水处理时频率、声功率/声强以及声化学反应器的物理结构(实质是声场分布)等声学参数对处理效果的影响。结论表明,对不同的废水溶液存在超声降解的最佳频率和最佳声功率/声强;双频或多频超声较单频超声在处理同一废水溶液时有明显的协同效应;混响场中的空化阈值比行波场低,相同条件下更利于声化学产额的提高。分析了目前超声水处理技术研究不够深入的原因,并对其发展进行了讨论和展望。

Effects of acoustic parameters of power ultrasound on wastewater treatment efficiency

After the introduction of the cavitation mechanisms, the effects of acoustic parameters, such as frequency, sound power, sound intensity, and the physical structures of sonochemical reactors （sound field distribution）, on wastewater treatment efficiency by power ultrasound are discussed. The reasons for the incomprehensiveness of the study and its development are also discussed. The results show that there are optimum frequency, optimum sound power and optimum sound intensity in the power ultrasonic degradation of different wastewater and there is an obvious synergistic effect in the degradation of wastewater by double-frequency or multi-frequency ultrasound, compared with single frequency ultrasound degradation. The cavitation threshold is lower and the sonochemical yield is greater in the reverberation field than in the traveling wave field.