投加不同碱性药剂对管网铁释放的影响

发布时间：2018-04-22 06:09

本文选题：水源切换 + 碱度　；参考：《环境科学研究》2015年01期

【摘要】：针对不同水源切换可能使管网铁释放增加而引起黄水的问题,搭建了管网模拟中试系统,比较了投加3种不同碱性药剂对管网铁释放的影响.结果表明:1投加NaHCO3调节进水碱度,当进水碱度为94~251 mg/L(以CaCO3计)时,增加进水碱度能够有效抑制管网系统的铁释放,并且出水中ρ(TFe)(TFe为总铁)达到GB 5749—2006《生活饮用水卫生标准》(30 mg/L).2p H为7.83~9.01时,采用投加NaOH调节进水p H对管网铁释放无明显抑制作用甚至有所促进;而投加Ca(OH)2调节进水pH虽然能够在一定程度上抑制管网铁释放,但抑制效果有限,不能保证出水中ρ(TFe)达标.3当进水中ρ(SO42-)较低时,试验后期停止投加Na HCO3或Ca(OH)2后,管网系统铁释放能够维持在较低水平;但当进水中ρ(SO42-)较高时,停止投加Na HCO3或Ca(OH)2后,管网铁的释放又会明显升高.
[Abstract]:In order to solve the problem of yellow water caused by the increase of iron release from different water sources, a pilot system is set up to simulate the effect of 3 different basic agents on the release of iron in pipe network. The results show that 1 adding NaHCO3 to adjust the alkalinity of the water inlet, when the alkalinity of the influent is 94~251 mg/L (CaCO3), it is effective to increase the alkalinity of the influent. When the iron release of the pipe network system is suppressed, and the TFe (TFe is total iron) in the effluent reaches GB 5749 to 2006< drinking water sanitary standard > (30 mg/L).2p H as 7.83~9.01, the addition NaOH regulation of the influent P H has no obvious inhibition effect on the release of iron in the pipe network, while adding Ca (2) to adjust the influent can be suppressed to a certain extent. The iron release of the pipe network is limited, but the inhibition effect is limited, and the release of the iron in the pipe network can not be guaranteed at a lower P (TFe) standard.3 when the P (SO42-) is low in the influent. After the addition of Na HCO3 or Ca (OH) 2 in the later stage of the test, the iron release of the pipe network system can be maintained at a lower level, but the release of the iron in the pipe network will be obvious after the addition of the Na HCO3 or Ca (OH) 2 in the influent. Rise.

【作者单位】：中国科学院生态环境研究中心中国科学院饮用水科学与技术重点实验室;华北水利水电大学环境与市政工程学院;北京市自来水集团有限责任公司;
【基金】：国家水体污染控制与治理科技重大专项(2012ZX07404-002) 国家自然科学基金项目(51178450,51378493)
【分类号】：TU991.3

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