多孔板与文丘里组合式空化灭活致病菌研究

A study on pathogenic microorganisms in raw water killed by hydrodynamic cavitation due to combined device of square multi-orifice plate with Venturi tube

基于浙江工业大学水力学实验室自主研发的方孔多孔板与文丘里组合式水力空化反应装置,通过变换多孔板与文丘里喉部、文丘里扩散角的不同组合,针对取自非饮用水源的原水,以水中菌落总数和大肠杆菌为指示菌,研究了空化数、喉部流速、孔口排列、原水初始体积分数和水力空化作用时间等因素对灭菌效果的影响,并探讨其产生的内在机理。实验结果表明:当组合形式为25孔交错式孔板、喉部300 mm、扩散角为4.3°时可达到对菌落总数和大肠杆菌最优灭活效果。同时,降低空化数、提高喉部流速、延长水力空化作用时间和选取适当的原水初始体积分数都将有助于进一步提高装置的灭活效果。

Based on a self-developed hydrodynamic cavitation reaction device,Escherichia coli and total colony count in a non-potable water source were chosen as the indicator bacteria to study the effects of the cavitation number,the throat velocity,the arrangement of orifice,the initial concentration of raw water,and the cavitation time on the inactivation rates of Escherichia coli and total colony count by different combinations of the multi-orifice plate,the Venturi throat,and the diffusion angle.The experimental results showed that the optimal inactivation effect was achieved as the combined form was staggered with 25-orifice multi-orifice plate,throat length of 300 mm,and diffusion angle of 4.3°.In addition,reducing the cavitation number,increasing the throat velocity,prolonging the cavitation time,and selecting a proper initial concentration of raw water would improve the inactivation effects of Escherichia coli and total colony count.