Hawley A L, Fallowfield H J
Health and Environment Group, College of Science and Engineering, Flinders University, G.P.O. Box 2100, Adelaide 5001, South Australia, Australia E-mail:
Water Sci Technol. 2018 Aug;78(1-2):31-36. doi: 10.2166/wst.2018.269.
Attenuation of sunlight in wastewater treatment ponds reduces the depth of the water exposed to disinfecting irradiances. Shallow pond depth with paddlewheel rotation increases exposure of pathogens to sunlight in high rate algal ponds. Generation of thin films, using pond walls as inclined planes, may increase inactivation of pathogens by increasing sunlight exposure. The performance of a laboratory based model system incorporating an inclined plane (IP) was evaluated. F-RNA bacteriophage, in tap water or wastewater, was exposed to sunlight only on the IP with the bulk water incubated in the dark. MS2 inactivation was significantly higher when the IP was present (P < 0.05) with a 63% increase observed. Prolonged exposure increased MS2 die-off irrespective of IP presence. Versatility of the IP was also demonstrated with faster inactivation observed in both optically clear tap water and wastewaters. IPs of different surface areas produced similar inactivation rates when operated at similar hydraulic loading rates regardless of slope length.
污水处理池中阳光的衰减会减少暴露于消毒辐照的水体深度。在高速藻类池塘中，浅池深度结合桨轮旋转可增加病原体对阳光的暴露。利用池塘壁作为倾斜平面生成薄膜，可通过增加阳光照射来提高病原体的灭活率。对一个包含倾斜平面（IP）的实验室模型系统的性能进行了评估。F-RNA噬菌体，无论是在自来水还是废水中，仅在倾斜平面上暴露于阳光，而大量水体在黑暗中孵育。当存在倾斜平面时，MS2的灭活率显著更高（P < 0.05），观察到增加了63%。无论倾斜平面是否存在，延长暴露都会增加MS2的死亡。在光学清澈的自来水和废水中都观察到更快的灭活，这也证明了倾斜平面的通用性。当以相似的水力负荷率运行时，不同表面积的倾斜平面无论坡度长度如何都产生相似的灭活率。
