The environmental contamination caused by antibiotics is increasingly conspicuous due to their widespread manufacture and misuse. Plasma has been employed in recent years for the remediation of antibiotic pollution in the environment. In this work, a falling-film dielectric barrier discharge was used to degrade the antibiotic tetracycline (TC) in water. The reactor combined the gas-liquid discharge and active gas bubbling to improve the TC degradation performance. The discharge characteristics, chemical species’ concentration, and degradation rates at different parameters were systematically studied. Under the optimized conditions (working gas was pure oxygen, liquid flow rate was 100 mL/min, gas flow rate was 1 L/min, voltage was 20 kV, single treatment), TC was removed beyond 70% in a single flow treatment with an energy efficiency of 145 mg/(kW·h). The reactor design facilitated gas and liquid flow in the plasma area to produce more ozone in bubbles after a single flow under pure oxygen conditions, affording fast TC degradation. Furthermore, long-term stationary experiment indicated that long-lived active species can sustain the degradation of TC. Compared with other plasma treatment systems, this work offers a fast and efficient degradation method, showing significant potential in practical industrial applications.

中文翻译：

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使用降膜介质阻挡放电单流处理降解水中的抗生素

由于抗生素的广泛生产和滥用，其造成的环境污染日益突出。近年来，等离子体已被用于修复环境中的抗生素污染。在这项工作中，使用降膜介质阻挡放电来降解水中的抗生素四环素（TC）。该反应器将气液放电和活性气体鼓泡相结合，提高了TC的降解性能。系统地研究了不同参数下的放电特性、化学物质浓度和降解率。在优化条件下（工作气体为纯氧，液体流量为100 mL/min，气体流量为1 L/min，电压为20 kV，单次处理），单次流量处理TC去除率超过70%能源效率为145 mg/(kW·h)。该反应器设计促进了等离子体区域中气体和液体的流动，在纯氧条件下单次流动后在气泡中产生更多的臭氧，从而实现快速TC降解。此外，长期静态实验表明，长寿命的活性物质可以维持TC的降解。与其他等离子体处理系统相比，这项工作提供了一种快速有效的降解方法，在实际工业应用中显示出巨大的潜力。