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New Findings Regarding the Impacts of Suspended Particles on UV Disinfection of Drinking Water

机译：悬浮颗粒物对饮用水紫外线消毒影响的新发现

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The impact of suspended particles on both UV dose transmission and spectrophotometric absorbance measurement for unfiltered raw water with turbidity up to 10 NTU was assessed. Results from bench scale "collimated beam" experiments indicate that a low percentage of total incident UV light is attenuated by particles at 5 NTU turbidity. However, at a set applied UV dose, when particles were added to achieve turbidity from 1 to 10 NTU, the average dose in the collimated beam reactor decreased from 5 to 30 percent respectively, suggesting that spikes in particles entering a UV reactor may compromise lethal delivery of UV energy if not adjusted for. UV absorbance coefficients, measured using direct and integrating sphere spectroscopy (which accounts for scattering effects by particles) were significantly different, suggesting that suspended particles in unfiltered water both absorb and scatter UV light. When absorbance, measured using the direct method, was used to model the average irradiance in a UV reactor, the average UV irradiance was underestimated by 5 to 20 percent at turbidity of 3 to 10 NTU, respectively, as compared to irradiance calculations made using integrating sphere absorbance measurements. This analysis suggests that UV systems designed based on direct absorbance measurements of unfiltered waters with turbidity above 3 NTU may be overly conservative.
机译：对于浊度高达10 NTU的未过滤原水，评估了悬浮颗粒对UV剂量传输和分光光度法吸光度测量的影响。台式“准直光束”实验的结果表明，在5 NTU浊度下，总入射紫外线的百分比较低，被颗粒衰减。但是，在设定的紫外线剂量下，当添加颗粒以使浊度从1到10 NTU时，准直束反应器中的平均剂量分别从5％降低到30％，这表明进入紫外线反应器的颗粒中的尖峰可能会损害致死性。如果不进行调整，将传递紫外线能量。使用直接和积分球光谱法（其解释了颗粒的散射效应）测量的UV吸收系数显着不同，这表明未过滤水中的悬浮颗粒会吸收和散射UV光。当使用直接法测量的吸光度用于对UV反应器中的平均辐照度进行建模时，与使用积分进行的辐照度计算相比，在3到10 NTU的浊度下，平均UV辐照度低估了5％至20％。球吸收度测量。该分析表明，基于浊度高于3 NTU的未过滤水的直接吸光度测量设计的紫外线系统可能过于保守。

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