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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Indoor air purification by dielectric barrier discharge combined with ionic wind: physical and microbiological investigations
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Indoor air purification by dielectric barrier discharge combined with ionic wind: physical and microbiological investigations

机译：通过介电阻挡排放与离子风相结合室内空气净化：物理和微生物研究

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摘要

A non-thermal plasma source based on a surface dielectric barrier discharge (DBD) is developed for purification of recirculating air in operating theatres in hospitals. This is a challenging application due to high flow rates, short treatment times and the low threshold for ozone in the ventilated air. Therefore, the surface DBD was enhanced in order to generate an ionic wind, which can deflect and thus, filter out airborne microorganisms. Electrical and gas diagnostics as well as microbiological experiments were performed in a downscaled plasma source under variation of various electrical parameters, but application-oriented airflow velocity and humidity. The dependence of electrical power and ozone concentration as well as charged particles in the plasma treated air on frequency, voltage and relative humidity is presented and discussed. The presence of humidity causes a more conductive dielectric surface and thus a weaker plasma formation, especially at low frequency. The airborne test bacteria, Escherichia coli, showed significant effect to plasma treatment (up to 20% reduction) and to plasma with ionic wind (up to 90% removal); especially a configuration with 70% removal and an accompanying ozone concentration of only 360 ppb is promising for future application.
机译：基于表面介电阻挡放电（DBD）的非热等离子体源被开发用于纯化医院操作剧院的循环空气。这是由于通风空气中的高流速，臭氧的短处理时间和低阈值，这是一个具有挑战性的应用。因此，表面DBD得到增强以产生离子风，这可以偏转，从而过滤出空气传播的微生物。在各种电气参数的变化下，在较差的等离子体源中进行电气和气体诊断以及微生物实验，但是取向的气流速度和湿度。呈现和讨论了电力和臭氧浓度以及等离子体处理空气中的带电粒子的依赖性，并讨论了频率，电压和相对湿度。湿度的存在导致更导电的介电表面，从而使等离子体形成较弱，尤其是在低频率下。空气中的测试细菌大肠杆菌对血浆治疗（降低高达20％）和离子风（较高90％）的血浆表现出显着影响;特别是具有70％去除和伴随臭氧浓度仅为360ppb的配置是对未来的应用。

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