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目的了解2008-2015年广州市分质供水水质的卫生状况,为监督管理等提供科学依据。方法收集2008-2015年广州市各分质供水站的水质监测数据进行统计分析。结果 2008-2015年采集1 959份水样中17.15%存在超标现象,水源水耗氧量、浊度、锰、铁和细菌总数的超标率(7.66%、6.89%、4.29%、1.84%和17.15%)高于处理后(5.67%、0.77%、0.46%、0.00%和5.67%),差异均有统计学意义(P<0.05);2011-2015年水源水的细菌超标率(19.40%、13.58%、1.27%、6.85%和2.50%)与2010年(40.66%)相比下降,且差异有统计学意义(P<0.05)。2008-2015年末梢水的铅超标率均高于水源水和处理水(P<0.05),且超标的样品主要来自天河区,占超标总数的62.86%。结论市政水经过深度处理后各理化指标的不超标率普遍上升。但管网末梢水的铅超标率均高于水源水和处理水,应加强分质供水管道的预防性卫生审查。
Objective To understand the health status of sub-quality water supply in Guangzhou from 2008 to 2015 and provide a scientific basis for supervision and management. Methods The data of water quality monitoring of various water supply stations in Guangzhou during 2008-2015 were collected for statistical analysis. Results Exceeding the standard was observed in 1795% of 1 959 samples collected during 2008-2015. The over-standard rates (7.66%, 6.89%, 4.29%, 1.84% and 17.15%) of water source water oxygen consumption, turbidity, %) Were higher than that of the control (5.67%, 0.77%, 0.46%, 0.00% and 5.67%), the difference was statistically significant (P <0.05) %, 1.27%, 6.85% and 2.50%, respectively) compared with that in 2010 (40.66%), and the difference was statistically significant (P <0.05). The lead exceeding standard of peripheral water from 2008 to 2015 was higher than that of water source water and treated water (P <0.05), and the excessive samples mainly came from Tianhe District, accounting for 62.86% of the total. Conclusion After municipal treatment, the non-over standard rates of various physical and chemical indicators have generally risen. However, the excess lead in the water of the pipe network is higher than that of the source water and the treated water, and the preventive health examination of the sub-quality water supply pipelines should be strengthened.