组合式水力空化杀灭原水中病原微生物的试验

基于浙江工业大学水力学实验室自主研发的由三角形孔口多孔板和文丘里管构成的组合式水力空化装置,以菌落总数和大肠杆菌作为病原微生物的指示菌,对杭州市区胜利河原水不同体积比水样进行灭菌处理。通过琼脂平板计数法检测菌落总数和大肠杆菌的杀灭率,研究了水力空化对水中菌落总数和大肠杆菌的杀灭效果,分析了文丘里管扩散段的扩散角,三角形孔口多孔板的孔口数量、孔口排列方式,原水体积比以及空化数对菌落总数和大肠杆菌杀灭率的影响。试验结果表明,选取合适的扩散角和原水体积比,适当增加孔口数量,采用交错式孔口排列方式多孔板和降低空化数可以提高菌落总数和大肠杆菌杀灭率。

Experiment on pathogenic microorganisms in raw water killed by a combined hydrodynamic cavitation device

In this study, a combined hydraulic cavitation device composed of a triangular multi-orifice plate and a Venturi Pipe developed by the Hydraulics Laboratory of Zhejiang University of Technology, was used to sterilize the pathogenic microorganisms in the raw water samples taken from the Shengli River in Hangzhou with different volume ratios. Escherichia coli and the total colony count were chosen as the indicator bacteria of the pathogenic microorganisms. The effects of diffusion angles of the Venturi tube diffusion section, number of orifices of the triangular multi-orifice plate, arrangement of the orifices, volume ratio of the raw water and the number of cavitation on the killing rates of pathogenic microorganisms were studied by the agar plate method. The experimental results show that choosing an appropriate diffusion angle and the raw water volume ratio, increasing the orifice number, using staggered orifice layout, and lowing the cavitation number can considerably increase the killing rates of the total colony count and Escherichia coli.