| MBR处理医院污水后续氯消毒及其消毒副产物研究 |
| 摘要点击 2087 全文点击 1938 投稿时间：2006-07-10 修订日期：2006-08-30 |
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| 中文关键词 膜生物反应器（MBR） 医院污水 氯化消毒 三卤甲烷 卤代乙酸 |
| 英文关键词 membrane bioreactor (MBR) hospital wastewater chlorination disinfection trihalomethanes (THMs) haloacetic acids (HAAs) |
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| 中文摘要 |
| 针对医院污水中致病微生物的特殊排放要求，研究了膜生物反应器（MBR）应用于医院污水处理中的预消毒及其后续氯消毒特性.结果表明，在工程应用中MBR具有显著的预消毒作用，对医院污水中的细菌总数和粪大肠杆菌的去除率分别达到2.0～3.1 lg和2.8～4.0 lg；对于MBR出水中残留的微生物，采用次氯酸钠进行后续消毒，当接触时间为1 h，在有效氯浓度为0.8 mg/L时，可检测不出粪大肠杆菌，且放置6 h未见再生长，相应的THMs和HAAs分别为16.94 μg/L和32.10 μg/L；固定接触时间，随着Cl2/DOC值的增加，MBR出水中THMs和HAAs均近似呈线性增长趋势（r2分别为0.941?5和 0.965?2），且HAAs的增长速率高于THMs. |
| 英文摘要 |
| Hospital wastewater with its high content of pathogens poses a grave problem for the community. The aim of this study was to evaluate the pre-disinfection characteristics of membrane bioreactor (MBR), and chlorination with disinfection by-products for the effluent from the MBR in a hospital wastewater treatment. The experimental results show that the removal rates of total bacteria and fecal coliform by this MBR are 2.0～3.1 lg and 2.8～4.0 lg respectively, which serves as a remarkable pre-disinfection unit. In this time-course study, sodium hypochlorite (NaClO) was used as disinfectant to inactivate the residual indicator bacteria in the effluent from MBR. When the concentration of available chlorine is 0.8 mg·L-1, the fecal coliform can been completely inactivated with contact time of 1 h, and while the THMs and HAAs produced are 16.94 μg·L-1 and 32.10 μg·L-1, respectively. Along with the increasing of Cl2/DOC value, the fitting curves of THMs and HAAs both present approximately linearity relation, and the slope coefficient of HAAs is higher than that of THMs. |
