水质指数在评价上海市浦东新区2012年饮水水质中的应用
Application of Water Quality Index to Assessment on Drinking Water Quality in Pudong New Area,Shanghai,2012
-
摘要:
目的 应用水质指数评价上海市浦东新区出厂水、管网水和二次供水水质现状。 方法 利用加拿大水质指数法评价浦东新区2012年水厂的出厂水、管网水和二次供水水质。采用逐步回归法对14项水质指标进行评价,以逐步回归法对水质指数的敏感性进行分析。 结果 浦东新区水厂的出厂水、管网水、二次供水监测点均存在水质超标问题。检测项目的超标数对水质评价指标影响最大。氨氮、浑浊度、高锰酸盐指数超标次数和频率最高;但浑浊度、铁、锰、高锰酸盐指数等指标对水质指数影响最大。以就近河道为水源的地区氨氮污染严重、水质较差。 结论 加拿大水质指数法能有效地评价不同类型水的水质质量,对于有效判别和强化水质管理具有重要的应用价值。 Abstract:Objective To evaluate drinking water quality using water quality index (WQI) in Pudong New Area,Shanghai. Methods Water samples were collected from finished water,trunk pipes and secondary supply systems.Fourteen indices were selected for revised Canadian water quality index (WQI).Backward stepwise logistic regression analyses were performed for sensitivity analysis. Results Disqualified samples were identified in all the sampling locations.The number of disqualified indices showed an impact to WQI with the highest degree.Ammonia,turbidity,and CODMn were the indices with the highest disqualified sample counts comparing to the relevant national standards,but iron,manganese,CODMn,and turbidity contributed most to WQI.The quality of drinking water samples sourcing from nearby rivers was the worst with significant disqualified index of ammonia. Conclusion Canadian water quality index (WQI) provides an effective way to assess the quality of different water samples and is of significant value in water quality management.
下载:
