Coagulation behavior of aluminum salts in eutrophic water:: Significance of Al13 species and pH control
Coagulation behavior of aluminum salts in eutrophic water:: Significance of Al13 species and pH control
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DOI：
10.1021/es051423
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发表时间：
2006-01-01
影响因子：
11.4
通讯作者：
Ru, J
中科院分区：
文献类型：
--
作者：
Hu, CZ;Liu, HJ;Ru, J
从Al（III）水解形态转化的角度研究了铝盐在富营养化水源水中的混凝行为。特别强调了Al-13物种对去除颗粒物和有机物的混凝效果。通过烧杯实验和水解Al（III）形态分布表征，研究了不同碱度铝混凝剂的混凝性能。结果表明，铝混凝剂的混凝效果与混凝过程中的Al-13含量呈正相关，而与初始混凝剂中的Al-13含量无关。由于AlCl 3在混凝过程中不仅能生成Al-13形态，而且还能作为pH控制剂，因此AlCl 3比聚合氯化铝（PACT）更能有效去除富营养化水体中的浊度和溶解性有机物。固态Al-27 NMR谱显示，从AlCl 3和PACT形成的沉淀物是显着不同的，并证明在凝固过程中，预制的Al-13聚合物比原位形成的更稳定。pH控制可以通过调节Al的形态来改善混凝过程，尤其是对DOC的去除，其中AlCl 3的效果最好。
The coagulation behavior of aluminum salts in a eutrophic source water was investigated from the viewpoint of Al(III) hydrolysis species transformation. Particular emphasis was paid to the coagulation effect of Al-13 species on removing particles and organic matter. The coagulation behavior of Al coagulants with different basicities was examined through jar tests and hydrolyzed Al(III) speciation distribution characterization in the coagulation process. The results showed that the coagulation efficiency of Al coagulants positively correlated with the content of Al-13 in the coagulation process rather than in the initial coagulants. Aluminum chloride (AlCl3) was more effective than polyaluminum chloride (PACT) in removing turbidity and dissolved organic matter in eutrophic water because AlCl3 could not only generate Al-13 species but also function as a pH control agent in the coagulation process. The solid-state Al-27 NMR spectra revealed that the precipitates formed from AlCl3 and PACT were significantly different and proved that the preformed Al-13 polymer was more stable than the in situ formed one during the coagulation process. Through regulating Al speciation, pH control could improve the coagulation process especially in DOC removal, and AlCl3 benefited most from pH control.