紫外线消毒拖尾效应的研究

Tailing Effect of UV Disinfection

紫外线消毒实验选用大肠杆菌为消毒对象。相同紫外强度、剂量条件下,测定不同水流高度(1.0 cm、2.0 cm、3.0 cm),不同流速(20 L/h、40 L/h、60 L/h)时,紫外剂量和大肠杆菌灭活率的关系曲线,并做相互比较。结果表明:紫外消毒过程中存在"拖尾"效应,对消毒效率产生较大影响;以流量为变量,随着流量增加、流动状态的激烈,拖尾效应在减弱,消毒效率在提升;以水流高度为变量,随着水流高度的增加,拖尾效应略微的增强,消毒效率有所下降。显然,水流高度变化对于拖尾效应和消毒效率的影响要弱于流量变化带来的影响。

E. coli was selected in the ultraviolet disinfection. Under the same UV intensity and dose,the E. coli inactivated curves were investigated in different water height（1. 0 cm,2. 0 cm,3. 0 cm） and different flow（ 20 L / h,40 L / h,60 L / h）,and then compare to each other. The results showed that tailing effect occured in ultraviolet disinfection and had larger impact on disinfection efficiency. Base on the flow,with the flow increasing and state intense,the tailing phenomenon weakened gradually and disinfection efficiency was developed as well,Furthermore,as the height of flow elevated,the tailing phenomenon enhanced slightly,on the contrary,the efficiency of disinfection was weakened more or less. It was obvious that the height of flow impacting on the tailing effect and disinfection efficiency was much weaker than the flow changing dose.