2007-2008年德州市二次供水水质调查

目的]了解德州市德城区二次供水的卫生状况。方法]现场调查二次供水基本卫生状况，同时采集水样进行检测，并对检测结果进行分析。结果]对65个二次供水单位260份水样检测，合格57份，合格率21．92％。其中，色度、嗅味、肉眼可见物、砷、铁、锰、氨氮、亚硝酸盐氮、硝酸盐氮、pH值合格率100．00%；菌落总数106份合格，合格率为40．77％；大肠菌群150份合格，合格率为57．69％；浑浊度221份合格，合格率为85．00％；游离余氯57份合格，合格率为21．92％。结论]二次供水水质合格率较低，要加强预防性卫生监督，做好水质二次消毒工作。

Investigation on Water Quality of Secondary Water Supply in Dezhou City from 2007 to 2008

Objective]To understand the hygienic status of water from second water supplies. Methods] On-the-spot investigation was conducted on the basic hygienic status of the second water supply, water samples were collected and tested,the results were analyzed. Results]260 water samples collected from 65 units of second water supply were tested,57 of them were qualified, accounting for 21.92 %. The qualified rate of color scale, odor, visible materials, arsenic, iron, mangahum, ammonia nitrogen, nitrite nitrogen,nitrate nitrogen and p H value was 100. 00 %. 160 of them were qualified for total colony,accounting for 40. 77 %. 150 of them were qualified for coil group,accounting for 57.69 %. 221 of them were qualified for opacity, accounting for 85 %. 57 of them were qualified for free chlorine residue, accounting for 21.92 %. Conclusion]The qualified rate.of water from second water supply was low, preventive health supervision must be strengthened, disinfection for 2 times must be carried out.