pH对铝盐絮凝剂形态分布与混凝除氟性能的影响

被引：58

作者：

鞠佳伟

高玉萍

何赞

刘锐平

机构：

[1] 中国科学院生态环境研究中心环境水质学国家重点实验室

来源：

环境工程学报 | 2015年 / 9卷 / 06期

关键词：

氟; PACl; 碱化度; 铝形态; ζ电位;

D O I：

暂无

中图分类号：

TU991.2 [净水工程（给水处理）];

学科分类号：

081403 [市政工程];

摘要：

对比研究了Al Cl3和3种不同碱化度的聚合氯化铝(PACl)在不同p H与投量下除氟效果,并对不同形态铝盐除氟机理进行了初步探讨。结果表明,p H对絮凝剂水解后铝形态分布及其除氟效果有重要影响。p H 5～6时,Al3+和Al2、Al3等低聚态铝为Al Cl3主要形态,且Al Cl3更易水解生成可将溶解态氟转化为颗粒态氟的A1(OH)3,从而较PACl具有更佳除氟效果。p H>7时,PACl较Al Cl3具有更佳除氟效果,且增大PACl碱化度可促进氟的去除,这主要是由于具有较高Al13含量的PACl更容易与电负性F-结合所致;且絮凝剂混凝除氟絮体ζ电位越高,越利于F-在絮体表面吸附。

引用

页码：2563 / 2568

页数：6

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