Yoon Chun G, Chung Kwang-Wuk, Ham Jong-Hwa, Jeon Ji-Hong
Department of Rural Engineering, Konkuk University, Seoul, Korea.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2004;39(3):835-46. doi: 10.1081/ese-120027745.
A pilot study was performed to examine the feasibility of UV disinfection for agricultural reuse of reclaimed water. The effluent from the bio-filter of a 16-unit apartment was used as input to the flow-through type UV disinfection system, with average suspended solid (SS) and biological oxygen demand (BOD) concentrations of 3.4 and 5.9 mg/L, respectively, and a mean level of total coliforms in the range of 1.5 x 10(4) MPN/100 mL. UV disinfection was found to be effective, in that it reduced mean concentration of indicator microorganisms (total coliform [TC], fecal coliform [FC], and E. coli) to less than 100 MPN/ 100 mL within 60s exposure using 17, 25, and 40 W lamps. The microorganisms often exceeded 200 MPN/100 mL with 17 and 25W lamps, but were completely removed with 40W lamp in one cylindrical chamber. Disinfection with two chambers in series demonstrated complete removal for all the experiments. About 30 mW x s/cm2 was thought to be adequate for the disinfection of secondary effluent to keep the suggested bacterial standards of 100 MPN FC/100 mL for agricultural reuse. Water quality effect on the UV efficiency was not apparent within the experimental conditions. Statistical analysis showed that the removal rates of TC, FC, and E. coli did not significantly vary with turbidity, dissolved organic matter (DOM), or SS concentrations (p = 0.05). Photo-reactivation problems after UV disinfection might be a lesser concern in agricultural reuse than for other uses, due to exposure of water to solar radiation and resulting inactivation. Overall, UV disinfection of effluent from secondary level wastewater treatment plants in Korea was thought to be an effective and feasible alternative for agricultural reuse, and thus it is strongly recommended.
进行了一项试点研究，以检验紫外线消毒用于再生水农业回用的可行性。将一个16单元公寓生物滤池的出水用作流通式紫外线消毒系统的进水，其平均悬浮固体（SS）和生物需氧量（BOD）浓度分别为3.4 mg/L和5.9 mg/L，总大肠菌群平均水平在1.5×10⁴MPN/100 mL范围内。结果发现紫外线消毒是有效的，即使用17瓦、25瓦和40瓦的灯管，在60秒的照射时间内可将指示微生物（总大肠菌群[TC]、粪大肠菌群[FC]和大肠杆菌）的平均浓度降低至100 MPN/100 mL以下。使用17瓦和25瓦的灯管时，微生物数量经常超过200 MPN/100 mL，但在一个圆柱形消毒室内使用40瓦的灯管可将其完全去除。串联两个消毒室进行消毒的所有实验均实现了完全去除。对于二级出水消毒以保持农业回用建议的细菌标准100 MPN FC/100 mL，约30 mW·s/cm²被认为是足够的。在实验条件下，水质对紫外线消毒效率的影响不明显。统计分析表明，TC、FC和大肠杆菌的去除率随浊度、溶解有机物（DOM）或SS浓度的变化不显著（p = 0.05）。由于水暴露于太阳辐射并导致失活，紫外线消毒后的光复活问题在农业回用中可能比其他用途受到的关注较少。总体而言，韩国二级污水处理厂出水的紫外线消毒被认为是农业回用的一种有效且可行的替代方法，因此强烈推荐。
