Disinfection characteristics of an advanced rotational hydrodynamic cavitation reactor in pilot scale

Ultrasonics Sonochemistry

Grzegorz Boczkaj¹  Zhengquan Wang²  Yang Tao²  Joon Yong Yoon²  Li Ji²  Shan Zhao³  Xiaoxu Xuan³  Xuewen Li³  Xun Sun³  Songying Chen⁴ 

[1] Corresponding authors at: Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education, School of Mechanical Engineering, Shandong University, 17923, Jingshi Road, Jinan, Shandong Province, 250061, China.;National Demonstration Center for Experimental Mechanical Engineering Education, Shandong University, Jinan 250061, China;Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education, School of Mechanical Engineering, Shandong University, Jinan 250061, China;School of Public Health, Shandong University, Jinan 250061, China;

关键词: Water disinfection;    Sonochemistry;    Hydrodynamic cavitation;    E. coli;    Disinfection mechanism;   

DOI  :  

来源: DOAJ

【 摘 要 】

Hydrodynamic cavitation is a promising technique for water disinfection. In the present paper, the disinfection characteristics of an advanced hydrodynamic cavitation reactor (ARHCR) in pilot scale were studied. The effects of various flow rates (1.4–2.6 m3/h) and rotational speeds (2600–4200 rpm) on the removal of Escherichia coli (E. coli) were revealed and analyzed. The variation regularities of the log reduction and reaction rate constant at various cavitation numbers were established. A disinfection rate of 100% was achieved in only 4 min for 15 L of simulated effluent under 4200 rpm and 1.4 m3/h, with energy efficiency at 0.0499 kWh/L. A comprehensive comparison with previously introduced HCRs demonstrates the superior performance of the presented ARHCR system. The morphological changes in E. coli were studied by scanning electron microscopy. The results indicate that the ARHCR can lead to serious cleavage and surface damages to E. coli, which cannot be obtained by conventional HCRs. Finally, a possible damage mechanism of the ARHCR, including both the hydrodynamical and sonochemical effects, was proposed. The findings of the present study can provide strong support to the fundamental understanding and applications of ARHCRs for water disinfection.

【 授权许可】

Unknown