东莞市城镇生活饮用水卫生现状分析及水质影响因素研究

Analysis on the current hygienic situation of drinking water in Dongguan city and study on the influence factors

目的了解近年来东莞市城镇生活饮用水卫生现状,并研究输配管网和二次供水设施对水质的影响因素。方法分析2005～2010年期间东莞市镇级以上集中式供水单位水源水、出厂水、管网水和二次供水的卫生监测结果,选定某镇的饮用水输配系统和二次供水单位研究饮用水水质的影响因素。结果水源水的总体合格率仅为15.33%,6年来合格率呈上升趋势;出厂水的总体合格率为76.26%,6年来合格率呈下降趋势;管网水的总体合格率为83.33%,6年来总体呈下降趋势,二次供水的合格率为11.48%。结论东莞市水源水主要是受工业污水和生活污水中有机污染物的污染,但呈逐年改善;游离余氯合格率低是东莞市生活饮用水水质的主要问题;管网水水质状况受管材、管龄和输送距离的影响,也跟不同季节有关。

Objective To understand the status quo of sanitary of drinking water in Dongguan City from 2005 to 2010, and analyze the influence factors of pipe net and secondary water supply establishent. Methods We analyzed the monitoring results of source water, treated water, pipe network water and secondary water supply of central water supply units in Dongguan from 2005 to 2010, and studied the influence factors of drinking water quality in pipe net and secondary water supply establishment in a chosen town. Results The total eligible rate of source water was only 15.33%, but it tended to get higher in the six years. The total eligible rate of treated water was 76. 26%, and it tended to get lower in the six years. The total eligible rate of tap water was 83.33%, and it tended to get lower in the six years. The total eligible rote of secondary water supply was 11.48%. Conclusion Organic pollutants are the main water pollutants in Dongguan City, and the main sources of pollution are domestic sewage and industrial effluents. The sanitary quality of water source has been remarkably improved. The main problem is that the eligible rate of free residual chlorine is low. The sanitary quality of pipe network water was influenced by pipe materials, ages and length and related to different seasons also.