Characterization of flocs generated by preformed and in situ formed Al13 polymer
Characterization of flocs generated by preformed and in situ formed Al13 polymer
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预成型和原位成型 Al13 聚合物产生的絮凝物的表征
DOI：
10.1016/j.cej.2012.05.041
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发表时间：
2012-07
影响因子：
15.1
通讯作者：
Jiuhui Qu
中科院分区：
文献类型：
--
作者：
Guixia Chen;Huijuan Liu;He Zhao;Jiuhui Qu
在混凝过程中，高Al 13含量的聚合氯化铝（PAC）和高AlCl3含量的聚合氯化铝（AC）在最佳pH条件下，Al 13聚合物和原位生成的Al 13聚合物分别是铝的主要水解产物。从Al形态与絮体表面结构关系的角度，研究了预制和原位生成Al 13聚合物生成的絮体的结构和形态。结果表明，在pH 6时，PAC和AC絮凝体的主要组成分别为Al 13聚合物聚集体和无定形Al氢氧化物。与原位生成的絮凝体相比，预制Al 13聚合物生成的絮凝体具有更好的结晶结构，而与原位生成的絮凝体相比，预制Al 13聚合物生成的絮凝体具有更小的尺寸和更光滑的表面结构。在弱酸性条件下，高铝投加量下，沉淀氢氧化铝吸附是高岭土去除的主要途径。预成型的Al 13聚合物具有较强的电中和能力，而原位成型的Al 13聚合物生成的絮体对高岭土颗粒具有较高的吸附能力。混凝过程中铝的形态分布决定了铝混凝剂的絮体性质和混凝效果。本研究有助于进一步认识混凝机理，为水处理过程中混凝剂的选择提供依据。
During coagulation process, preformed and in situ formed Al13polymer are the predominant aluminum hydrolysis species at the optimal pH condition for polyaluminum chloride (PACl) containing high content of Al13and AlCl3(AC), respectively. The structure and morphology of the flocs generated by preformed and in situ formed Al13polymer were investigated from the viewpoint of the relationship between Al speciation and flocs surface structure. The results showed that at pH 6 the predominant composition of PACl and AC flocs were Al13polymer aggregate and amorphous Al hydroxide, respectively. The flocs generated by preformed Al13polymer had a better crystalline structure than those from in situ formed one, while they had smaller size and smoother surface structure than those formed by in situ formed Al13polymer. During weak acidic pH condition and at high dosage of Al coagulant adsorption onto precipitated Al hydroxides was the main pathway for kaolin particle removal. Preformed Al13polymer showed a stronger charge neutralization ability, while the flocs generated from in situ formed Al13polymer exhibited a higher adsorption capacity for kaolin particles. Al species distribution during coagulation process governs the floc character and coagulation efficiency of Al coagulant. The present study further conduces to the understanding of coagulation mechanism and puts forward a basis for coagulant selection during water treatment process.
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影响因子：
11.4
作者：
PARKER, DR;BERTSCH, PM
通讯作者：
BERTSCH, PM
影响因子：
11.4
作者：
Huazhang Zhao;Jian-xiong Peng;Shrong-Shi Lin;Yan Zhang
通讯作者：
Huazhang Zhao;Jian-xiong Peng;Shrong-Shi Lin;Yan Zhang
影响因子：
9.9
作者：
Zhao, He;Liu, Huijuan;Qu, Jiuhui
通讯作者：
Qu, Jiuhui
影响因子：
11.4
作者：
Hu, CZ;Liu, HJ;Ru, J
通讯作者：
Ru, J
影响因子：
--
作者：
BOTTERO, JY;CASES, JM;POIRIER, JE
通讯作者：
POIRIER, JE