Lang Yong-Me, Liu Chao-Bin, Yu Yong-Zhen, Qian Yu-Jia, Zhang Li, Liu Wei
School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China.
Huan Jing Ke Xue. 2010 Jun;31(6):1470-7.
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.
利用动力学消毒曲线研究了二级出水中悬浮固体对大肠杆菌氯消毒“拖尾”现象的影响。较高的悬浮固体浓度导致“拖尾”区域更早开始，且灭活水平较低。消毒曲线的lg-lg回归分析比较表明，悬浮固体浓度与总体灭活率相关，当悬浮固体浓度从6 mg/L增加到85 mg/L时，总体灭活率降低了10倍。消毒曲线的分段建模结果表明，悬浮固体浓度（在10 - 55 mg/L范围内）与“拖尾”区域的起始时间以及拖尾区域起始点的对数杀灭率相关（R2>0.99）。随着悬浮固体浓度增加，起始时间从330分钟缩短至55分钟，对数杀灭率从5.8降至0.8。更好地去除悬浮固体将提高拖尾区域大肠杆菌的对数杀灭率和灭活率，从而降低建设和运行成本。此外，较高的氯剂量和较低的pH值可略微提高“拖尾”区域的对数杀灭率。
