颗粒物的庇护作用对紫外线消毒效果的影响

Effect of Particle Protection in Ultraviolet Disinfection

以某污水厂的紫外线消毒单元为研究对象,跟踪研究紫外线的消毒情况,分析出水浊度对消毒效果的影响;同时通过小试,研究颗粒物对粪大肠菌群的遮蔽、包裹作用对紫外线消毒效果的影响。结果表明,紫外线消毒效果随出水浊度的升高而降低,当出水浊度<3.5 NTU时,取得良好的紫外线消毒效果。颗粒物对紫外线消毒效果的影响主要与颗粒物的包裹作用及自身粒径有关,浊度对紫外线消毒效果的影响主要是颗粒物的包裹作用造成的,而能起到包裹作用的颗粒物粒径>5μm。

This research studied an UV disinfection unit in a wastewater treatment plant, and analyzed the impact of water turbidity on disinfection effects. Through a pilot test, the shielding effect and protection roles of the particles on fecal coliforms and its impacts on ultraviolet disinfection were studied. The results showed that, the UV disinfection effect decreased with the increase of the water turbidity, and the UV disinfection effect reached maximum when water turbidity was less than 3.5 NTU. The effect of particles on UV disinfection was related to the package effect and the bridging effect of particles. The package effect was a major factor in coliform protection, while the bridging effect was insignificant. In addition, the effect of UV disinfection was related to the particle sizes, especially when the size was larger than 5 μm.