Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Ji'nan 250100, China.
J Hazard Mater. 2011 May 15;189(1-2):203-10. doi: 10.1016/j.jhazmat.2011.02.017. Epub 2011 Feb 15.
Coagulation performance, mechanism of poly-aluminum-silicate-chloride (PASiC) and residual Al speciation in the effluent with respect to a specific surface water treatment in China were comprehensively investigated in this study. The impact of OH(-)/Al(3+) and Si/Al molar ratios on the coagulation performance, mechanism and residual Al speciation of PASiC in surface water treatment was discussed as a function of coagulant dosage. It was intended to provide an insight into the relationship between coagulation performance and residual Al. Experimental results revealed that when OH(-)/Al(3+) molar ratio = 2.00 and Si/Al molar ratio = 0.0500 in PASiC coagulant, PASiC exhibited beneficial coagulation property and relatively lower content of residual Al. Surface bridging and entrapment was more effective compared with charge neutralization during the specific surface water treatment. The majority of residual Al in the effluent existed in the form of insoluble suspended or particulate Al. Dissolved organically bound Al was almost the major speciation in dissolved Al and dissolved inorganically bound monomeric Al was the only component in dissolved monomeric Al. Al in PASiC remained abundant at lower dosages and residual Al concentration could be effectively reduced at the dosages of 12.0-15.0mg/L as Al.
本研究综合考察了在中国特定地表水处理中聚硅酸铝氯（PASiC）的混凝性能、机理及出水中残留 Al 的形态。讨论了 OH(-)/Al(3+)摩尔比和 Si/Al 摩尔比对混凝剂投加量下 PASiC 的混凝性能、机理和残留 Al 形态的影响。旨在深入了解混凝性能与残留 Al 之间的关系。实验结果表明，当 PASiC 混凝剂中 OH(-)/Al(3+)摩尔比=2.00、Si/Al 摩尔比=0.0500 时，PASiC 表现出良好的混凝性能和相对较低的残留 Al 含量。与电荷中和相比，表面桥联和截留在特定地表水处理中更为有效。出水中的大部分残留 Al 以不溶性悬浮或颗粒状 Al 的形式存在。溶解有机结合态 Al 几乎是溶解 Al 的主要形态，溶解无机单体 Al 是溶解单体 Al 的唯一成分。在较低剂量下，PASiC 中的 Al 含量仍然丰富，当投加量为 12.0-15.0mg/L 时，残留 Al 浓度可有效降低。
