| 悬浮颗粒对污水氯消毒“拖尾”现象的影响 |
| 摘要点击 2480 全文点击 2330 投稿时间：2009-08-05 修订日期：2009-12-17 |
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| 中文关键词 二级出水 消毒 氯 悬浮颗粒 拖尾 |
| 英文关键词 secondary effluent disinfection chlorine suspended solid tailing |
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| 中文摘要 |
| 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6 mg/L升高至85 mg/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10～55 mg/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330 min降低到55 min，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. |
| 英文摘要 |
| 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. |
