颗粒物对紫外线灭活二级出水中粪大肠菌的影响

用低压紫外线照射具有相同颗粒物粒径分布的一系列水样,把实验结果带入二重动力学模型进行计算,评价自然状态下颗粒物对粪大肠菌的保护作用. 结果表明,二级出水中的大部分粪大肠菌都与颗粒物交连在一起;在颗粒物<10⁵ C·mL^-1时,颗粒物的增加会明显降低紫外线对二级出水中粪大肠菌的灭活率,但当颗粒物>10⁵ C·mL^-1时,这种影响不明显.从二重动力学模型的计算结果来看,对于不同颗粒物浓度的水样,难灭活的微生物所占的比重很小且比较稳定,大多数与颗粒物结合的粪大肠菌都较易被紫外线灭活.

Impact of Particle on UV Disinfection for Wastewater

Water samples with similar particle distribution were irradiated by low-pressure UV. Experiment results were input into the two-kinetic model for calculation. The approach applied in this experiment allowed the assessment of the effect of particles on UV inactivation of FC in their natural state. The results showed that FC concentration increased with the particle number. Particle significantly lowered the inactivation rate of the indigenous FC in the secondary water with elevated particle content when the particle number was less than 10⁵ C·mL^-1. On the other hand, the impact was not very significant when the particle number exceeded 10⁵ C·mL^-1. Based on the calculation results of a two-kinetic model, for the different number of particles, the ratio of the FC which was difficult to inactivate was stable, while most of the FC which were holed in the particles were easy to inactivate.