For large-scale production of plasma-activated water (PAW) with high concentrations of reactive species, a novel high-power dielectric barrier (DBD) PAW generator with superior antibacterial properties has been developed. The discharge power of this generator is 970 W. The concentrations of long-lived species H₂O₂, NO₂⁻, and NO₃⁻ in the PAW treated by plasma for 6 min were 59.27, 718.49, and 3341.42 μmol/L, respectively. The pH decreased from 7.70 to 3.05, and the energy cost for the total active species generation decreased from 40.62 to 33.88 MJ/mol. As the plasma exposure time increased, the bactericidal ability of PAW was substantially enhanced with the increase in acidification of PAW and the increase in active species concentration. With the increase of standing time of the suspension after mixing PAW and bacterial solution, the internal reactions of PAW are fully processed, resulting in the inactivation of more bacteria and the enhancement of the bactericidal effect. As the contact area between the suspension and the air became larger, the NO₂⁻ in PAW were oxidized to NO₃⁻, which affected the generation of ONOO⁻ and other key active species, resulting in a great attenuation of the activity of PAW and a decrease in the bactericidal ability. Finally, the PAW treated with plasma for 6 min and mixed with the bacterial solution in a closed centrifuge tube for 20 min can achieve a more desirable bactericidal effect, and the bactericidal rate reached 99.99%.

为了大规模制备具有高浓度活性粒子的等离子体活化水(PAW), 提出一种新型高功率介质阻挡PAW发生装置, 其放电功率可达到 970 W。实验表明, 等离子体处理6 min后, PAW中长寿命粒子H₂O₂, NO₂⁻和NO₃⁻的浓度分别为59.27, 718.49和3341.42 μmol/L, pH值从7.70降至3.05, 总活性粒子制备能耗从40.62 MJ/mol降至33.88 MJ/mol。PAW的酸化程度随等离子体处理时间的增加而增加, 活性粒子浓度大幅度升高, PAW的杀菌能力大幅度增强。随着PAW与菌液混合后的混悬液静置时间增加, PAW内部反应充分进行, 致使更多细菌失活, 杀菌效果提升。随着混悬液与空气接触面积变大, PAW中的NO₂⁻被氧化为NO₃⁻, 影响ONOO⁻等关键活性物质的生成, 导致PAW活性极大衰减, 杀菌能力降低。实验结果表明, 等离子处理6 min的PAW与菌液混合后, 混悬液在密闭离心管 中静置20 min即可取得较理想的杀菌效果, 杀菌率达到99.99%。