三角孔多孔板水力空化杀灭原水中病原微生物

利用自主研发的新型三角孔多孔板水力空化装置对胜利河原水进行消毒处理，采用压力数据采集系统采集水力空化工作段压力、显微镜观察菌体形态变化、平板计数法计数菌落总数、酶底物法检测总大肠菌群和大肠埃希氏菌；研究了三角孔多孔板的水流空化数、孔口大小、孔口数量、孔口排列和原水浓度梯度对水力空化杀灭原水中病原微生物的影响.结果表明：选择适当的原水浓度、增大孔口数量、减小孔口大小以及改进孔口排列方式（如交错式）时，均可进一步提高原水中病原微生物杀灭率.菌群杀灭率在5min时可达到稳定高效杀灭值，15min时菌落总数杀灭率可达80%以上，总大肠菌群和大肠埃希氏菌杀灭率均可达90%以上，甚至完全杀灭.

Killing pathogenic microorganism by hydrodynamic cavitation due to triangular multi-orifice plates

A self-developed hydrodynamic cavitation generator with triangular multi-orifice plates in the Hydraulics Laboratory at Zhejiang University of Technology was used to sterilize raw water in Shengli River of Hangzhou. Pressure in hydrodynamic cavitation working section were measured by the pressure data acquisition system. Morphological changes in coliform were observed by the biological microscope. Total colony count was detected by plate counting method, and enzyme substrate technique was used to detect total coliform and Escherichia coli. Effects of cavitation number, different initial concentration of raw water, number of orifice, size of orifice and arrangement of orifice on killing pathogenic microorganisms by hydrodynamic cavitation were experimentally studied. Choosing the appropriate initial concentration, increasing the orifice number, decreasing the orifice size and improving orifice arrangement could further increase the killing rates of pathogenic microorganism in raw water. The killing rate of the bacteria colony can reach stable and efficient killing value at 5min. At 15min the killing rate of total colony count reached 80%, and more than 90%, even 100% total coliform and Escherichia coli were killed.