真空紫外线应用于水消毒和净化领域的理论基础和潜力

Theoretical Basis and Potential Application of 185 nm Vacuum Ultraviolet in Water Disinfection and Purification

低压汞灯中的汞蒸汽在电弧的作用下会发射出253.7 nm和184.8 nm两个波长的紫外线。253.7 nm波长的紫外线广泛用于消毒,而185 nm紫外线的光子有很高的能量,具有很高的氧化性。与253.7 nm紫外线相比,185 nm紫外线的消毒机理不同,它是通过无选择地对微生物细胞的各器官进行氧化,这种消毒机理在理论上可避免253.7 nm紫外线消毒中的光复活问题。在环境净化领域,作为一种不加化学药剂的纯净高级氧化技术,有望在分解水中的新兴污染物方面发挥作用。185 nm紫外线在空气中会产生臭氧,合理利用这些臭氧,可以实现单灯组成的双波长(184.8 nm、253.7 nm)紫外线+臭氧的高级氧化装置,高效地进行消毒或环境净化。185 nm紫外线和其他高级氧化技术结合,可以实现远大于1+1的高级氧化效果。

When electric arc exerts on the mercury vapour,it will give off 253.7 nm and 184.8 nm ultraviolet.253.7 nm ultraviolet is widely used for disinfection.The photon of 184.8 nm ultraviolet possesses high energy and strong oxidation power.The disinfection mechanism of 184.8 nm is different from 25.7 nm.It oxidizes all organisms of microbe cells without bias.Such a mechanism can inhibit photoreactivation,which is a problem in 253.7 nm ultraviolet disinfection.In the field of environmental purification,as an AOP technology without chemicals,it is hoped to play a role in removing emerging contaminants from water.185 nm ultraviolet generates ozone in the air.If such ozone can be applied,a system with two wavelengths(184.8 nm and 253.7 nm)of ultraviolet plus ozone can be composed,which can efficiently do disinfection and/or environment purification.The combination of 185 nm UV and other AOP can achieve much higher high effect of 1+1>2.