文丘里空化空蚀杀灭大肠杆菌的试验研究  

Experimental study of Escherichia coli killed by hydrodynamic cavitation due to venturi tube

作　　者：耿坤 董志勇[1] 张凯[1] 居文杰[1] 赵文倩 李杨如 秦兆雨 王磊[1] GENG kun;DONG Zhi-yong;ZHANG kai;JU Wen-jie;ZHAO Wen-qian;LI Yang-ru;QIN Zhao-yu;WANG lei(College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, China)

机构地区：[1]浙江工业大学建筑工程学院,浙江杭州310014

出　　处：《中国环境科学》2017年第9期3385-3391,共7页China Environmental Science

基　　金：国家自然科学基金资助项目(51479177)

摘　　要：利用自主研发的文丘里式水力空化反应装置,选取大肠杆菌为病原微生物的指示菌,对大肠杆菌水样进行灭菌处理.使用琼脂平板计数法检测大肠杆菌的杀灭率,同时利用生物显微镜观察大肠杆菌在空化空蚀作用前后的形态变化.分析了文丘里管喉部长径比、初始浓度、喉部流速、运行时间、水流空化数对大肠杆菌杀灭率的影响.实验结果表明:喉部长径比L/R=60时,大肠杆菌的杀灭效果最好;降低空化数、增加喉部流速、延长运行时间、选取合适的大肠杆菌初始浓度均有利于提高大肠杆菌的杀灭率.A self-developed Venturi-type hydrodynamic cavitation reaction device was used.Escherichia coli was selectedas the indicative bacterium of pathogenic microorganism,and water samples containing E.coli were sterilized.Killingrates of E.coli were detected by agar plate counting method.Morphological changes in E.coli before and after cavitationwere observed with a biological microscope.The effects of varying throat lengths,initial concentration,throat velocity,treatment time and cavitation number on the killing rates of E.coli were analyzed.The experimental results showed thatthe killing effect of E.coli was best at relative throat length L/R=60.Also,lowering cavitation number,increasing throatvelocity,prolonging treatment time,and choosing a suitable initial concentration of E.coli can be helpful to improving thekilling rates of E.coli.

关 键 词：喉部长径比 水力空化 文丘里管 大肠杆菌 饮用水消毒 

分 类 号：TV131[水利工程—水力学及河流动力学]