Madge Bethany A, Jensen James N
Department of Civil, Structural, and Environmental Engineering, University of Buffalo, New York 14260, USA.
Water Environ Res. 2006 Mar;78(3):294-304. doi: 10.2175/106143005x94385.
Suspended solids interfere with the efficiency of disinfection using UV radiation by decreasing the rate of disinfection and inducing tailing. However, conventional measures of solids (total suspended solids, turbidity, and UV transmittance) do not adequately predict the presence or degree of these effects. Bacteria and viruses can become associated with particles in wastewater. A fractionation technique was developed to separate particle-associated bacteria into three fractions, based on particle size. The results show that the degree to which particles interfere with UV disinfection efficiency is dependent on particle size. The small size fraction (< 5 microm) consistently produced a statistically significant faster disinfection rate than the large fraction (> 20 microm), with the unfiltered sample and the medium fraction (particles > 5 microm, but < 20 microm) between the two extremes. Tailing also was observed only in the large fraction. Correlations between the disinfection rate constant and the percentage of large fraction bacteria of a sample were good.
悬浮固体通过降低消毒速率和导致拖尾现象来干扰紫外线辐射消毒的效率。然而，传统的固体测量方法（总悬浮固体、浊度和紫外线透过率）并不能充分预测这些影响的存在或程度。细菌和病毒可能会与废水中的颗粒结合。开发了一种分级技术，根据颗粒大小将与颗粒结合的细菌分为三个部分。结果表明，颗粒干扰紫外线消毒效率的程度取决于颗粒大小。小尺寸部分（<5微米）始终产生统计学上显著更快的消毒速率，比大尺寸部分（>20微米）快，未过滤样品和中等尺寸部分（颗粒>5微米但<20微米）介于两者之间。拖尾现象也仅在大尺寸部分中观察到。样品的消毒速率常数与大尺寸部分细菌百分比之间的相关性良好。
