悬浮颗粒对污水氯消毒“拖尾”现象的影响  

Impacts of Suspended Solids on"Tailing"Phenomenon in Disinfection of Sewage with Chlorine

作　　者：梁咏梅[1] 刘超斌[1] 余永贞[1] 钱宇佳[1] 张丽[1] 刘伟[1] 

机构地区：[1]中山大学环境科学与工程学院,广州510275

出　　处：《环境科学》2010年第6期1470-1477,共8页Environmental Science

基　　金：国家自然科学基金项目(50508045)

摘　　要：利用动力学方法研究了悬浮颗粒对二级出水氯消毒灭活大肠杆菌"拖尾"现象的影响规律.SS浓度越高,消毒拖尾区出现越早,灭活率越低.双对数回归对比表明,SS与灭活速度线性相关,浓度从6mg/L升高至85mg/L,总的灭活速度降低约10倍.采用多次拟合统计分析发现,SS浓度在10～55mg/L范围内,悬浮颗粒浓度与拖尾区起始时间及起始点对数灭活率线性相关(R2>0.99).在此范围内随SS浓度升高,拖尾起始点的时间由330min降低到55min,对数灭活率由5.8降低至0.8.有效去除SS不仅能够提高拖尾区灭活率,也可以提高消毒效率,降低消毒池的投资和运行费用.高氯投量及低pH值均能一定程度提高"拖尾"区灭活率.The impacts of suspended solids in secondary effluent on＂tailing＂phenomenon in disinfection of E.coli with chlorine were investigated using kinetic disinfection curves.Higher SS concentration led to earlier beginning of ＂tailing ＂ region with lower inactivation level.Comparison between lg-lg regression analyses of disinfection curves demonstrated that the SS concentration correlated with overall inactivation rate,which decreased by 10 times while SS concentration increased from 6 to 85 mg /L.The results of segmental modeling of disinfection curves showed that the SS concentration（at a range of 10-55 mg /L） correlated with the starting time of＂tailing＂region as well as the log-kill at the starting point of tailing region（R2 0.99）.The starting time was shortened from 330 min to 55 min,and the log-kill dropped from 5.8 down to 0.8 with SS concentration increasing.Better removal of SS will improve the lg-kill of E.coli at tailing region and the inactivation rate,resulting in lower cost of construction and running.In addition,higher chlorine dosage and lower pH value could slightly enhance the log-kill in the＂tailing＂region.

关 键 词：二级出水 消毒 氯 悬浮颗粒 拖尾 

分 类 号：X799.3[环境科学与工程—环境工程]