The main aim of this work is inactivation of Escherichia coli in water using a laboratory-scale radio-frequency atmospheric pressure Argon plasma jet. This bacterium is widely present in the environment, especially in drinking water, and its pathogenic effects are very harmful. For this purpose, an Argon flow rate of 3.5 slm, maximum plasma power of 200 W, and discharge frequency of 13.56 MHz was conducted to generate a uniform plasma plume for water treatment. 150 ml of drinking water contaminated by E. coli was exposed to the radiation of plasma placed about 3 cm within the water, the treatment time varied from 2 to 6 minutes at 100, 150, and 200 W of plasma input power. The temperature of the plume, discharge current and voltage, and electron density were all measured to characterize the plasma. Active species such as excited molecules, ions, and radicals produced in the plasma in water were detected using the optical emission spectroscopy method. The decreasing behavior of live bacteria versus exposure time and plasma jet input power was observed, and finally, at the discharge power of 200 W and 6 min, an effective inactivation was achieved and the number of bacteria reduced from 92×10⁴ to less than 1.7 MPN/100 ml.

这项工作的主要目的是使用实验室规模的射频大气压氩等离子体射流灭活水中的大肠杆菌。这种细菌广泛存在于环境中，尤其是饮用水中，其致病作用非常有害。为此，进行了 3.5 slm 的氩气流速、200 W 的最大等离子体功率和 13.56 MHz 的放电频率，以产生用于水处理的均匀等离子体羽流。150 毫升被大肠杆菌污染的饮用水暴露于放置在水中约 3 cm 处的等离子体辐射下，在 100、150 和 200 W 的等离子体输入功率下，处理时间从 2 到 6 分钟不等。测量羽流的温度、放电电流和电压以及电子密度来表征等离子体。使用光学发射光谱法检测水中等离子体中产生的活性物质，如激发分子、离子和自由基。观察到活细菌随暴露时间和等离子体射流输入功率的减少行为，最终在200 W和6 min的放电功率下，实现了有效灭活，细菌数量从92×10 ⁴减少到小于1.7 MPN/100 毫升。