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针对二次供水用水量日变化系数大的特点,设计了一套由流量自动调节光照强度的紫外消毒系统,并通过试验确定了该装置的最佳操作工况,即当用水量<2.5 m3/h、2.5～7.3 m3/h或>7.3 m3/h时,通过自动控制系统开启不同数量25 W的UV灯管使其光照强度分别为0.54×1019、0.82×1019和1.48×1019quanta/s时,可满足灭菌达标要求。同时考察了浊度、光照强度、接触时间等对紫外杀菌效果的影响。结果表明:当原水浊度<5 NTU时,其对紫外杀菌效果无明显影响;在一定条件下,光照强度越强,接触时间越长,杀菌效果越好。
Aiming at the large diurnal variation coefficient of secondary water supply, a set of UV disinfection system was designed to automatically adjust the light intensity by the flow rate, and the best operation condition of the device was determined through experiments. When the water consumption was less than 2.5 m3 / h, 2.5 ~ 7.3 m3 / h or> 7.3 m3 / h, when the illumination intensity of UV lamps with different numbers of 25 W were turned on by the automatic control system respectively to 0.54 × 1019, 0.82 × 1019 and 1.48 × 1019quanta / s, Can meet the sterilization requirements. At the same time, the effects of turbidity, light intensity and contact time on the bactericidal effect of UV were investigated. The results showed that when the turbidity of raw water was less than 5 NTU, it had no significant effect on the bactericidal effect of UV. Under certain conditions, the stronger the light intensity and the longer the contact time, the better the bactericidal effect.