一起广西某生活饮用水厂供水水质污染事件调查

Investigation on an Accident of Water Source Pollution in a Tap Water Factory of Guangxi

目的调查某城郊饮用水厂供水水质污染事件原因。方法现场调查与实验室检测相结合,按《生活饮用水卫生规范》(2001)、CJ/T206-2005、GB5749-85相应项目进行调查、检测和评价。结果在该自来水厂水源水(水面下0.2m)、进厂水(取水点深6m)、出厂水各取1份水样检测,色度15～100度,浑浊度0.72～17度,水质有微弱异味和弱腥味,铁0.11～2.60mg/L,锰0.02～0.57mg/L,氯化物4.29～4.56mg/L,氨氮0.09～0.17mg/L,硫酸盐1.14mg/L。取水源水面下3.5m水样按规范常规项目全分析,除游离余氯外均符合规范要求。结论饮用水水质浑浊变味可能是由于枯水期水源水库水量减少,水体自净和复氧能力不足,水源取水点上游1000m内网箱养鱼,来自饲料等有机物厌氧分解,取水点过于接近水库底部所至。

Objective To study a pollution accident of drinking water source in Guangxi. Methods Combing field investigation and test in the laboratory, the water samples were investigated, determined and evaluated according to the Sanitary Standards for Drinking Water （2001）, C J/T206 - 2005, and GB5749 - 85. Results In this tap water factory, samples were taken from the water source （water surface down 0.2 m depth）, the entering water （water surface down 6 m depth）, and the factory supplied water respectively to detect the various items; the chroma was between 15 - 100, trubidity was between 0.72-- 17, with slight fishy smell, iron content 0.11 --2.60 mg/L, manganese 0.02 --0.57 mg/L, chloride 4.29-4.56 mg/L, ammonia 0.09-0.17 mg/L, and sulfate 1.14 mg/L. Drawing the water from entering water spot of 3..5 m depth, all the required inspective items of the samples were fitted with the criteria except residue chlorine. Conclusions The event of drinking water pollution might be due to the reduced source water pool, the resulted insufficient self - clean and oxygen sup-plementary ability. In addition, there are 2 net aquaria in the 1,000 m upstream of this factory water source, organic matter from feed decomposition increases oxygen comsumption, and the drawing water spot is too near the bottom of the reservoir are all the unfavorable factors.