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. 2010 Jun 15;178(1-3):596-603. doi: 10.1016/j.jhazmat.2010.01.127. Epub 2010 Feb 1.
The fractionation and measurement of residual aluminum was conducted during the treatment of humic (HA)-kaolin synthetic water with Al(2)(SO(4))(3), AlCl(3) and polyaluminum chloride (PAC) in order to investigate the effect of pH on the coagulation performance as well as residual aluminum speciation. Experimental results suggested that turbidity removal performance varied according to the following order: AlCl(3)>PAC>Al(2)(SO(4))(3). HA removal performance of PAC was better than that of AlCl(3) under acidic condition. The optimum pH range for AlCl(3) and Al(2)(SO(4))(3) was between 6.0 and 7.0 while PAC showed stable HA and UV(254) removal capacity with broader pH variation (5.0-8.0). For the three coagulants, majority of residual aluminum existed in the form of total dissolved Al (60-80%), which existed mostly in oligomers or complexes formed between Al and natural organic matter or polymeric colloidal materials. PAC exhibited the least concentration for each kind of residual aluminum species as well as their percentage in total residual aluminum, followed by AlCl(3) and Al(2)(SO(4))(3) (in increasing order). Moreover, PAC could effectively reduce the concentration of dissolved monomeric Al and its residual aluminum ratio was the least among the three coagulants and varied little at an initial pH between 7.0 and 9.0.
采用 Al(2)(SO(4))(3)、AlCl(3)和聚合氯化铝(PAC)处理腐殖质(HA)-高岭土合成水，进行残余铝的分馏和测量，以研究 pH 值对混凝性能以及残余铝形态的影响。实验结果表明，浊度去除性能按以下顺序变化：AlCl(3)>PAC>Al(2)(SO(4))(3)。在酸性条件下，PAC 的 HA 去除性能优于 AlCl(3)。AlCl(3)和 Al(2)(SO(4))(3)的最佳 pH 范围在 6.0-7.0 之间，而 PAC 在较宽的 pH 变化范围内(5.0-8.0)表现出稳定的 HA 和 UV(254)去除能力。对于三种混凝剂，大部分残余铝以总溶解 Al 的形式存在(60-80%)，主要存在于 Al 与天然有机物或聚合胶体材料之间形成的低聚物或复合物中。PAC 表现出每种残余铝形态的最低浓度及其在总残余铝中的百分比，其次是 AlCl(3)和 Al(2)(SO(4))(3)(依次递增)。此外，PAC 可以有效降低溶解单体 Al 的浓度，并且其残余铝比例在三种混凝剂中最低，在初始 pH 值为 7.0-9.0 之间变化很小。
