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[目的]调查某公司管道直饮水加热后颜色变深的影响因素,阐明水质深度净化处理过程中产生二次污染的主要原因。[方法]分3次随机采集嘉兴市某公司地下室至17楼经管道直饮水系统净水设备处理后的水样33份及贮水箱底部可疑结晶物1 g,同时采集未通过管道直饮水系统的市政自来水16份作为对照,以GB/T 5750—2006《生活饮用水标准检验方法》为依据检验色度、浑浊度、臭和味、亚硝酸盐、肉眼可见物、铅、砷、铜、镉、铁、锰、锌、耗氧量、pH值、菌落总数、总大肠菌群。[结果]33份直饮水冷水合格率为27.3%;16份市政水合格率为100.0%。直饮水冷水的菌落总数、铜的超标率分别为57.6%、69.7%,铜的平均值是水质标准限值的1.12倍,其余14项指标合格率100.0%;pH值范围在5.0～6.8,均值是6.1。作为对照的市政供水各项指标检验结果均符合GB 5749—2006《生活饮用水卫生标准》。直饮机冷水检出的菌落总数、铜的超标率和市政供水比较差异均有统计学意义(P<0.05)。净化处理的出水(直饮水)亚硝酸盐含量高于进水(市政水)浓度,进水和出水中亚硝酸盐含量差异有统计学意义(P<0.05)。贮水箱底部结晶物确定是氢氧化铜结晶,黑色物质是氧化铜。[结论]铜质管材输送及净水在管网中滞留时间过长,分支管道的水循环不完全导致的二次污染是引起直饮水加热后颜色变深的主要原因。反渗透装置出水偏弱酸性,在新铜管内发生吸氧腐蚀,蓝色的氢氧化铜加热变成黑色的氧化铜。
[Objective] The research aimed to investigate the influencing factors of color darkening of a company’s direct drinking water after heating and clarify the main reasons for the secondary pollution in the process of deep water purification. [Methods] 33 samples of water samples and 1 g of suspicious crystals at the bottom of water storage tank were collected randomly from the basement of a company in Jiaxing City to the 17th floor via water purification equipment of direct drinking water system of pipelines in three times. At the same time, Municipal tap water 16 copies as a control to GB / T 5750-2006 “drinking water standard test method” as the basis for testing color, turbidity, odor and taste, nitrite, macroscopic, lead, arsenic, copper and cadmium , Iron, manganese, zinc, oxygen consumption, pH value, total number of colonies, total coliforms. [Result] The qualified rate of 33 direct drinking cold water was 27.3%. The qualified rate of 16 municipal water was 100.0%. The total number of coliform drinking straight water and cold water were 57.6% and 69.7%, respectively. The average value of copper was 1.12 times the standard limit of water quality and the pass rate of other 14 indicators was 100.0%. The pH value ranged from 5.0 to 6.8, Is 6.1. As a control municipal water supply indicators of the test results are in line with GB 5749-2006 “drinking water health standards.” Direct drinking machine cold water out of the total number of colonies detected, copper exceeded the standard and municipal water supply were statistically significant differences (P <0.05). The nitrite content of purified water (direct drinking water) was higher than that of water (municipal water), and there was a significant difference in nitrite content between influent and effluent (P <0.05). Crystallization of the bottom of the water tank to determine the crystallization of copper hydroxide, black material is copper oxide. [Conclusion] The secondary pollution caused by the transfer of copper tubing and water purification in the pipe network was too long. The secondary pollution caused by incomplete water circulation in the branch pipe was the main reason for the darkening of color after direct drinking water heating. Reverse osmosis plant effluent acidity weak, oxygen absorption in the new copper corrosion, blue copper hydroxide heated to black copper oxide.