Killing rate of colony count by hydrodynamic cavitation due to square multi-orifice plates

International Conference on Energy Engineering and Environmental Protection 2017

能源学;生态环境科学

Dong, Zhiyong^1 ; Zhao, Wenqian^1

College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou

310023, China^1

关键词: Cavitation number;    Conventional techniques;    Disinfection byproducts;    Drinking water disinfection;    Hydrodynamic cavitations;    Pathogenic microorganisms;    Reynolds shear stress;    Water supply engineering;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/121/2/022004/pdf
DOI  :  10.1088/1755-1315/121/2/022004

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Currently,in water supply engineering, the conventional technique of disinfection by chlorination is employed to kill pathogenic microorganisms in raw water. However, chlorine reacts with organic compounds in water and generates disinfection byproducts (DBPs), such as trihalomethanes (THMs), haloacetic acids (HAAs) etc. These byproducts are of carcinogenic, teratogenic and mutagenic effects, which seriously threaten human health. Hydrodynamic cavitation is a novel technique of drinking water disinfection without DBPs. Effects of orifice size, orifice number and orifice layout of multi-orifice plate, cavitation number, cavitation time and orifice velocity on killing pathogenic microorganisms by cavitation were investigated experimentally in a self-developed square multi-orifice plate-type hydrodynamic cavitation device. The experimental results showed that cavitation effects increased with decrease in orifice size and increase in orifice number, cavitation time and orifice velocity. Along with lowering in cavitation number, there was an increase in Reynolds shear stress,thus enhancing the killing rate of pathogenic microorganism in raw water. In addition, the killing rate by staggered orifice layout was greater than that by checkerboard-type orifice layout.