脉冲等离子体射流杀灭表面和水中的细菌

利用双极性高频脉冲电源和自制等离子体反应器,形成了直径为6 mm、长3～5 cm的氩气等离子体射流.当脉冲电压为2～5 kV,脉冲频率为1～3 kHz,氩气体积流量为33 L/min时,等离子体射流的功率为1～6 W.等离子体处理琼脂平板表面的大肠杆菌1~3 min后,产生直径为2～5 cm的杀菌斑.用来处理酶标板小孔内的250 μL大肠杆菌菌液时,05～20 min内可将大肠杆菌细胞密度下降6个对数.等离子体射流的灭菌效率随着处理间距的减小、脉冲电压和频率的增大而提高,但本质上取决于等离子体功率和能量密度.

Surface and water disinfection by pulsed plasma jet

Argon plasma jet was generated by a bipolar pulsed power source and a self-made plasma reactor. The diameter and length of plasma jet were 6 mm and 3-5 cm respectively. When pulsed voltage, pulsed frequency, and argon flow rate were 2-5 kV, 1-3 kHz and 33 L/min, the power of plasma jet was 1-6 W. It could rapidly inactivate E. coli bacteria on agar plate in 1-3 min with bactericidal spot of 2-5 cm. For treating 250 μL of aqueous E. coli, up to 6 orders reduction was obtained after 05-20 min. The disinfection efficiency of plasma jet was enhanced by raising the pulsed voltage or frequency as well as inducing the treatment distance. However, plasma power and energy density were essential factors determining the disinfection efficiency.