我国自来水的卫生标准是什么?

2025-03-14 22:00:37
推荐回答(3个)
回答1:

生活饮用水国家标准是GB5749和GBT5750,上面有各种检测项目和限值

回答2:

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回答3:

我国的卫生标准规定,加氯后,接触30分钟,每升水中含有的余氯不低于0.3毫克;集中式给水时,除出厂水应符合上述要求外,管网末梢每升水中余氯应不低于0.05毫克。消毒后,每毫升水中的细菌总数不超过100个,大肠菌群数每升应少于3个。用水时,有时会闻到氯味,那就是水中所含余氯的味道。

我们在网上找到北京的一次自来水的检查结果:硝酸盐0.7—9.7 mg/L(国标10 mg/L);硬度380 mg/L(国标450 mg/L);三氯甲烷0.011 mg/L(国标0.060 mg/L),说明是符合国家标准的。

自来水是如何消毒的?

我们饮用的自来水,是从水源取水后,经过混凝、沉淀、过滤后,再送入清水池内进行消毒。消毒大都采用氯化法,氯气用于自来水消毒具有消毒效果好,费用较低,有害物质极少的优点,是目前比较安全的消毒方法。

不可否认,氯气消毒也存在一定的问题。氯化消毒后的自来水能产生多种致癌物质,其中三氯甲烷(氯仿)是主要的争论点,目前也有用其他物质代替氯气的,但成本也要高得多。

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