大气压纳秒负脉冲放电对水中大肠杆菌的灭活

INACTIVATION OF E.COLI IN WATER BY NANOSECOND PULSED HIGH VOLTAGE AIR DISCHARGE

采用自行研制的喷嘴-板-筒式反应器,研究了大气压纳秒负脉冲空气放电对水中大肠杆菌(Escherichia coli,E.coli)灭菌率的影响因素及规律。实验中空气自放电喷嘴电极进入反应器,气流带动放电生成的活性粒子流到达并作用于水中大肠杆菌。研究结果表明:本实验装置可有效实现对水中大肠杆菌的灭活,灭菌率随着放电电压和脉冲重复频率的增加、放电处理时间的延长而升高;随着鼓气速率的增大先增大后减小;随着喷嘴电极直径的增加先减小后增大。当采用1.30 mm喷嘴电极,在脉冲峰值电压为-32 kV、重复频率80 Hz,鼓气速率为80 mL/min时,连续放电处理12 min,灭菌率达到91%。

In this paper,a nozzle-plate-cylinder reactor was developed and the effect of different factors on inactivation rate of the Escherichia coli(E.coli)in the water with the nanosecond negative pulsed air discharge at atmospheric pressure were investigated.The air flow was injected into the reactor through the discharge nozzle.The active species flow were produced in the discharge process and carried by the air flow to reach the the liquid.The results showed that the inactivation rate increased with the rise of discharge voltage,the pulse repetition rate and the discharge duration time.It increased firstly and then decreased with the air flow rate and decreased with the diameter of the electrode.The inactivation rate reached 91%when a 1.30 mm diameter electrode was adopted under the discharge duration time of 12 min,the disharge peak voltage of-32 kV,repeat frequenty of 80 Hz,and the air flow rate of 80 mL/min.