七乐彩走势图

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SHIJIAN:2016-02-26 LIULANCISHU:279CI

  “生活饮用水标准,是保证用户饮水安全应达到的标准,而不是自来水厂的出水水质的标准。”

  “我们关注自来水水质有三个环节,第一是水源地,二是中间处理环节,三是管网供给环节。”中间处理环节上,据了解,我国99%以上的自来水厂仍用100年前的常规处理工艺来处理现在的水。氯作为我国自来水中主要添加的杀菌剂,它本身可以和水中的有机物发生反应,生成三氯甲烷、三氯乙酸等具有致癌、致畸、致突变的消毒副产物,成为水的新污染源。氯在热水中还可能形成有毒气体,引起哮喘或过敏。中间处理环节中并没有去除水中的重金属、砷化物、氰化物、亚硝酸盐、有机污染物等有害物质。

  据中国之声《新闻纵横》报道,******的一项数据显示,我国的自来水合格率为83%。应该说,我国绝大多数城市自来水是符合用水标准的。但当自来水进入供水系统后,往往由于管网过长,管道陈旧、破损等原因,不可避免地产生铁锈,滋生微生物,也容易造成水质的二次污染。

  清华大学环境学院博士生导师,中国土木工程学会给水排水分会给水委员会副主任、给水深度处理研究会理事长,卫生部健康相关产品审评专家顾问王占生介绍,哈尔滨水处理公司现有的检测技术发现,水中有2221种有机化合物,在饮用水中发现有756种,其中有20种致癌物、23种可疑致癌物、18种促癌物和56种致突变物。

  水源水质严重污染,加上看不见的化学污染,如农药、抗生素、激素、杀虫剂、合成洗涤剂、重金属、各种有机和无机化合物及其他有害毒素等,中国疾病预防控制中心水质安全监测研究室主任鄂学礼研究员说:“目前我国90%的水厂仍在采用上世纪初形成的传统方法对水进行处理,只能对物理污染和微生物污染进行净化处理,而无法对化学污染,诸如农药、杀虫剂、合成洗涤剂、重金属、各种有机和无机化合物及其他有害毒素进行深度处理。”



  2. 1  GONGSHUI

  2. 1. 1  GAOZHILIANGYINYONGSHUIGONGJI

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  2. 1. 3  YIYAOYONGSHUI

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  2. 2  GONGYISHUIDECHULI(FENLI、NONGSUO、FENJIHECHUNHUA)

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  2. 2. 1  MOJISHUZAIZHIYAOGONGYEDEYINGYONG

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  2. 2. 2  MOJISHUZAISHIPINLINGYUGONGYEDEYINGYONG

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  2. 2. 3  MOJISHUZAIGEZHONGGONGYESHENGCHANZHONGDEYINGYONG

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  2. 3. 1  GEZHONGHANYOUFEISHUIJIFEIYOUDECHULI

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  2. 3. 2  FEISHUIDECHULIJIHUIYONG

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  2. 3. 3  SHUIDEDANHUAJISHU

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七乐彩走势图   2. 4  QITIFENLI、NONGSUOJISHUJIQIYINGYONG

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  2. 5  QITA

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七乐彩走势图   ZAIZHE,TONGGUOZHAOSHANGYINZI,YINJINJISHU,XIAOHUAXISHOU,TIGAOMOJISHUYINGYONGDEGONGYISHEJI、XITONGCHENGTAONENGLI,MOZHIBEIHEMOZUJIANSHUIPING,MOPINZHONGJIXIANGGUANJIDIANCHANPINDENGFANGMIANDADAOGUOJIXIANJINSHUIPING。


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