【摘要】 目的研究南京市饮用水中主要三卤甲烷的含量,初步探讨三卤甲烷含量与p H值、耗氧量的相关关系。方法对2009-2013年南京市24家集中式供水单位的548份出厂水和末梢水的三卤甲烷、p H值、耗氧量的检测结果进行整理分析。结果饮用水中三卤甲烷含量有逐年升高的趋势;末梢水中三氯甲烷含量高于出厂水;除三溴甲烷外,其余组份具有第三季度最高、液氯消毒的饮用水中高于复合二氧化氯消毒的饮用水、与p H值和耗氧量呈线性关系的特点。结论重视水源保护,强化常规工艺,减少前体物的同时还应重视溴离子的去除效果。优化消毒方法,严格控制管网水中消毒剂余量。更多还原

【Abstract】 Objective To investigate the concentrations of main trihalomethanes(THMs) constituents in drinking water in Nanjing,China, then analyze the correlation between THMs and the p H and oxygen consumption. Methods The monitoring database of 24 centralized water supply units was collected in Nanjing from 2009-2013, which contained 264 samples of finished water and 284 samples of pipe network water. Several quality indexes, including the concentrations of THMs, p H and oxygen consumption, were analyzed. Results The concentrations of total THMs and the main constituents(including trichlormethane, chlorodibromomethane,bromodichloromethane and tribromethane) were investigated. In the drinking water, the concentrations of these THMs, except tribromethane, showed some common features: an increasing trend year by year, highest concentrations occurring in the third quarter, higher concentrations in the chlorinated water than in the chlorine dioxide disinfected water, and linearly correlated with p H and oxygen consumption. The concentrations of trichlormethane and total THMs were higher in pipe network water than in finished water. Conclusion We should pay attention to the water sources protection, and strengthen the regular process. It is necessary to improve the disinfection process to reduce the byproducts in drinking water, and the effect of bromide ions should be take into consideration. Optimizing the method of disinfection, alternative disinfectants should be explored to reduce chlorinated byproduct formation.更多还原