Relative importance of hydrolyzed Al(III) species (Al(a), Al(b), and Al(c)) during coagulation with polyaluminum chloride: a case study with the typical micro-polluted source waters.
Relative importance of hydrolyzed Al(III) species (Al(a), Al(b), and Al(c)) during coagulation with polyaluminum chloride: a case study with the typical micro-polluted source waters.
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DOI：
10.1016/j.jcis.2007.08.036
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发表时间：
2007-12
影响因子：
9.9
通讯作者：
Mingquan Yan;Dongsheng Wang;J. Qu;Wenjie He;C. Chow
中科院分区：
文献类型：
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作者：
Mingquan Yan;Dongsheng Wang;J. Qu;Wenjie He;C. Chow
三种不同铝形态的相对重要性，Ala（单体物质，瞬时反应的物质）、Alb（中等聚合物物质，反应小于120 min）和Alc（胶体或固体物质，无反应），通过在聚合氯化铝（PAC）中使用铁试剂测量的定时络合反应速率来定义，在DOC（溶解有机碳）、UV 254和浊度去除效率方面进行了研究。以华北地区典型微污染沃茨为研究对象。结果表明，DOC的去除率与Alb的含量有很好的相关性，对UV254的去除率主要取决于Alb和Alc的含量，尤其是Alc的含量。除浊效果主要与Alc含量有关，但Alb能有效地破坏颗粒的稳定性，且Alb形成的絮体不如Alc形成的絮体大，影响了沉淀效果。与预制Alb不同，原位形成的Alb可以更有效地去除浊度，因为Alcis是在混凝过程中形成的主导最终物种。Al2O3具有很强的与有机物中某些不饱和配位键反应的能力，有利于颗粒物和DOC的去除。利用Ala、Alb和Alc的独特混凝特性，可开发出适合原水特性的PAC（具有正确的铝形态分布），以优化混凝效果。
The relative importance of three different Al species, Ala(monomeric species, instantaneous reacted species), Alb(medium polymer species, reacted less than 120 min), and Alc(colloidal or solid species, no reaction), defined by timed complexation reaction rate measured by using ferron reagent in polyaluminum chloride (PACl) was investigated in terms of DOC (dissolved organic carbon), UV254, and turbidity removal efficiencies. Micro-polluted, typical North China, source waters were used to conduct the experiments. The results show that DOC removal is correlated well to the content of Alb. Removal of UV254is determined by the content of Alband Alc, particularly Alc. Turbidity removal is primarily related to the content of Alc; however, Albcould destabilize particles efficiently, and the flocs formed by Albare not as large as those formed by Alc, which affected the settling efficiency. Unlike the preformed Alb, the in situ formed Albcould remove turbidity more efficiently since Alcis the dominant final species formed during coagulation. Alashows a strong ability to react with some unsatisfied coordinate bonds of organic matter to facilitate particle and DOC removal. The distinct coagulation feature of Ala, Alb, and Alccan be applied to develop tailor-made PACl (with the correct distribution of Al species) to match the characteristics of raw water for optimized coagulation.