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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。
Objective To study the content of major trihalomethanes in drinking water in Nanjing and to discuss the relationship between the content of trihalomethanes and p H and oxygen consumption. Methods The results of trihalomethanes, p H values and oxygen consumption of 548 ex-factory water and peripheral water from 24 centralized water supply units in Nanjing City during 2009-2013 were analyzed. Results The content of trihalomethanes in drinking water tended to increase year by year. The content of trichloromethane in peripheral water was higher than that of the ex-factory water. Except tribromomethane, the other components had the highest content in the third quarter, Chlorinated chlorine disinfection of drinking water, and p H value and oxygen consumption characteristics of a linear relationship. Conclusion The emphasis on water conservation, strengthening of conventional processes to reduce the precursors should also pay attention to the removal of bromide ions. Optimization of disinfection methods, strict control of disinfectant in water pipe network margin.