紫外线持续消毒能力的研究

紫外线消毒技术不向水中投加任何化学药剂,因此不具有持续消毒能力。对消毒后中水在不同保存条件下和不同静置时间下细菌增殖情况进行了实验研究,结果表明:紫外线消毒后的中水在最初的6h内细菌增殖缓慢,光照比避光条件下细菌增殖快,因此,紫外线消毒后的中水宜在6h内使用,且配水管网应采用不透光材料。同时对紫外线消毒和氯消毒技术的联用进行实验,结果表明紫外线消毒后的中水在投加了0.2mg/L的有效氯后可以放置5d。

Persistent disinfection ability of ultraviolet radiation

Ultraviolet disinfection technology does not have persistent disinfection ability,because of none chemical medicament added into the water.The circumstance of bacteria′s reproduction in disinfected reclaimed water under different preservation conditions and after different static duration were studied from the test,the results showed that: the reproduction speed of the bacteria in the reclaimed water after be disinfected by ultraviolet radiation was slow in the first 6 h,and the bacteria reproduced faster with illumination than in dark,therefore,the remclaimed water should be used in 6 h after the ultraviolet disinfection and the distribution pipes should be made of light-tight material.Meanwhile,a test of the combined use of ultraviolet disinfection technology and chlorine disinfection technology was made,the results indicated that,reclaimed water after the ultraviolet disinfection could be preserved for 5 days with 0.2 mg/L available chlorine added.