Chen Gui-Xia, Hu Cheng-Zhi, Zhu Ling-Feng, Tong Hua-Qing
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Huan Jing Ke Xue. 2013 Apr;34(4):1386-91.
Aluminum coagulants are widely used in arsenic (As) removal during the drinking water treatment process. Aluminium chloride (AlCl3) and polyaluminium chloride (PACl) which contains high content of Al13 were used as coagulants. The effects of aluminum species, pH, humic acid (HA) and coexisting anions on arsenic removal were investigated. Results showed that AlCl3 and PACl were almost ineffective in As(II) removal while the As(V) removal efficiency reached almost 100%. pH was an important influencing factor on the arsenic removal efficiency, because pH influenced the distribution of aluminum species during the coagulation process. The efficiency of arsenic removal by aluminum coagulants was positively correlated with the content of Al13 species. HA and some coexisting anions showed negative impact on arsenic removal because of the competitive adsorption. The negative influence of HA was more pronounced at low coagulant dosages. PO4(3-) and F(-) showed marked influence during arsenic removal, but there was no obvious influence when SiO3(2-), CO3(2-) and SO4(2-) coexisted. The present study would be helpful to direct arsenic removal by enhanced coagulation during the drinking water treatment.
在饮用水处理过程中，铝混凝剂被广泛用于去除砷（As）。使用了氯化铝（AlCl₃）和含有高含量Al₁₃的聚合氯化铝（PACl）作为混凝剂。研究了铝形态、pH值、腐殖酸（HA）和共存阴离子对砷去除的影响。结果表明，AlCl₃和PACl对As（II）的去除几乎无效，而对As（V）的去除效率几乎达到100%。pH值是影响砷去除效率的一个重要因素，因为pH值在混凝过程中影响铝形态的分布。铝混凝剂对砷的去除效率与Al₁₃形态的含量呈正相关。HA和一些共存阴离子由于竞争吸附而对砷的去除产生负面影响。在低混凝剂投加量时，HA的负面影响更为明显。PO₄³⁻和F⁻在砷去除过程中显示出显著影响，但当SiO₃²⁻、CO₃²⁻和SO₄²⁻共存时没有明显影响。本研究将有助于指导饮用水处理过程中通过强化混凝去除砷。
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