Water falling film dielectric barrier discharge (WFFDBD) has been widely studied for water treatment, due to its good performance on production of active species, mass transfer of active species from gas phase into liquid phase, and therefore the degradation of pollutants. However, few studies have focused on the production characteristics of active species of WFFDBD. In this paper, the formation characteristics of hydrogen peroxide, ozone and nitrate ions in a WFFDBD reactor powered by bipolar pulsed generator were studied under different electric discharge time, peak pulse voltage, power–frequency, air flow rate, water circulation flow rate, pH value and conductivity. The results show that the concentrations of hydrogen peroxide, ozone and nitrate ions increased with the peak pulse voltage, power supply frequency and water circulation flow rate, but the inputted air flow rate presented different effect on the production of active species. Moreover, the increase in pH value and conductivity led to a decrease in the concentration of hydrogen peroxide, while nitrate ion increased with the water pH value and conductivity. The p-nitrophenol degradation result indicates that both ozone and hydrogen peroxide contribute to its degradation possibly via their reaction into hydroxyl radical.

中文翻译：

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降膜降膜反应器中长寿命活性物种的生成特性

降膜介质阻挡放电（WFFDBD）因其在产生活性物质、活性物质从气相到液相的传质以及污染物降解方面的良好性能而被广泛研究用于水处理。然而，很少有研究关注WFFDBD活性物种的生产特性。本文研究了不同放电时间、峰值脉冲电压、工频、空气流量、水循环流量、pH值条件下，双极脉冲发生器驱动的WFFDBD反应器中过氧化氢、臭氧和硝酸根离子的形成特性。值和电导率。结果表明，过氧化氢、臭氧和硝酸根离子的浓度随着峰值脉冲电压、供电频率和水循环流量的增加而增加，但输入的空气流量对活性物种的产生有不同的影响。此外，pH值和电导率的增加导致过氧化氢浓度的降低，而硝酸根离子随着水的pH值和电导率的增加而增加。对硝基苯酚的降解结果表明，臭氧和过氧化氢都可能通过反应生成羟基自由基而导致其降解。