Instituto Nacional de Investigaciones Nucleares, AP. 18-1027, 11801 México D. F., México.
J Water Health. 2012 Sep;10(3):371-9. doi: 10.2166/wh.2012.132.
An experimental study of ATCC (American Type Culture Collection) 8739 Escherichia coli bacteria inactivation in water by means of pulsed dielectric barrier discharge (PDBD) atmospheric pressure plasmas is presented. Plasma is generated by an adjustable power source capable of supplying high voltage 25 kV pulses, ∼30 μs long and at a 500 Hz frequency. The process was conducted in a ∼152 cm(3) cylindrical stainless steel coaxial reactor, endowed with a straight central electrode and a gas inlet. The bacterial concentration in water was varied from 10(3) up to 10(8) E. coli cells per millilitre. The inactivation was achieved without gas flow in the order of 82% at 10(8) colony-forming units per millilitre (CFU mL(-1)) concentrations in 600 s. In addition, oxygen was added to the gas supply in order to increase the ozone content in the process, raising the inactivation percentage to the order of 90% in the same treatment time. In order to reach a higher efficiency however, oxygen injection modulation is applied, leading to inactivation percentages above 99.99%. These results are similarly valid for lower bacterial concentrations.
采用可调功率源产生的脉冲电介质阻挡放电（PDBD）大气压等离子体对 ATCC（美国典型培养物保藏中心）8739 大肠埃希氏菌在水中的失活进行了实验研究。该等离子体源能够提供 25 kV 的高压脉冲，脉冲长度约为 30 μs，频率为 500 Hz。该过程在一个约 152 cm(3)的圆柱形不锈钢同轴反应器中进行，该反应器配备有一个直中央电极和一个气体入口。水中的细菌浓度从 10(3)变化到 10(8)个大肠埃希氏菌细胞/毫升。在 600 秒内，在 10(8)个菌落形成单位/毫升（CFU mL(-1))浓度下，无需气流即可实现 82%的失活。此外，为了增加过程中的臭氧含量，向气体供应中添加了氧气，使同一处理时间内的失活百分比提高到 90%左右。然而，为了达到更高的效率，应用了氧气注入调制，导致失活百分比超过 99.99%。对于较低的细菌浓度，也得到了类似的结果。
