Generation of OH Radical by Ultrasonic Irradiation in Batch and Circulatory Reactor

2017 5th International Conference on Environment Pollution and Prevention

生态环境科学

Fang, Yu^1 ; Shimizu, Sayaka^2 ; Yamamoto, Takuya^1 ; Komarov, Sergey^1

Graduate School of Environmental Studies, Tohoku University, Miyagi Prefecture, Sendai

980-8579, Japan^1

Komatsu Ltd., Komatsu, Ishikawa Prefecture

923-0392, Japan^2

关键词: Acoustic cavitations;    Generation rate;    Optimum conditions;    Oxidation process;    Strong dependences;    Treatment efficiency;    Ultrasonic technology;    Ultrasound irradiation;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/120/1/012019/pdf
DOI  :  10.1088/1755-1315/120/1/012019

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Ultrasonic technology has been widely investigated in the past as one of the advance oxidation processes to treat wastewater, in this process acoustic cavitation causes generation of OH radical, which play a vital role in improving the treatment efficiency. In this study, OH radical formation rate was measured in batch and circulatory reactor by using Weissler reaction at various ultrasound output power. It is found that the generation rate in batch reactor is higher than that in circulatory reactor at the same output power. The generation rate tended to be slower when output power exceeds 137W. The optimum condition for circulatory reactor was found to be 137W output and 4L/min flow rate. Results of aluminum foil erosion test revealed a strong dependence of cavitation zone length on the ultrasound output power. This is assumed to be one of the reasons why the generation rate of HO radicals becomes slower at higher output power in circulatory reactor.