Determination of arsenic removal efficiency by ferric ions using response surface methodology
Determination of arsenic removal efficiency by ferric ions using response surface methodology
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DOI：
10.1016/j.jhazmat.2008.11.131
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发表时间：
2009-07-30
影响因子：
13.6
通讯作者：
Pala, Aysegul
中科院分区：
文献类型：
--
作者：
Baskan, Meltem Bilici;Pala, Aysegul
饮用水的砷污染在世界许多地区都是一个严重的问题。以氯化铁、硫酸铁和硫酸亚铁为混凝剂，采用沉淀/共沉淀法去除饮用水中的砷。采用Box-Behnken统计试验设计方法研究了主要操作变量如初始砷酸盐浓度（10-1000 μ g L-1）的影响。研究了混凝剂投加量（0.5 ~ 60 mg L ~（-1））和pH值（4-9）。实验数据用于确定响应函数系数。利用响应函数得到的砷酸盐去除率预测值与实验数据吻合较好。Fe（III）离子比Fe（II）离子更有效、更经济，因为其所需的混凝剂投加量和pH值较低。在低的砷酸盐初始浓度下，当氯化铁和硫酸铁投加量分别为50和40 mg L-1时，砷酸盐去除率最高;而在高的砷酸盐初始浓度下，当氯化铁和硫酸铁的投加量分别为37和32 mg L-1时，砷的去除率最高.本研究表明，Box-Behnken设计-响应面法在确定混凝除砷最佳工艺条件方面是可靠和有效的。(C)2008 Elsevier B. V.保留所有权利。
Arsenic contamination of drinking water is a serious problem in many parts of the world. The precipitation/coprecipitation method was used for arsenic removal from drinking water by ferric chloride, ferric sulfate and ferrous sulfate as coagulant. A Box-Behnken statistical experiment design method was used to investigate the effects of major operating variables such as initial arsenate concentration (10-1000 mu g L-1). coagulant dose (0.5-60 mg L-1) and pH (4-9) were investigated. Experimental data were used for determination of the response functions coefficients. Predicted values of arsenate removal obtained using the response functions were in good agreement with the experimental data. Fe(III) ions were more effective and economic than Fe(II) ion due to required lower coagulant dose and pH. In the low initial arsenate concentrations, the highest arsenate removal efficiency was required high ferric chloride and ferric sulfate dose of 50 and 40 mg L-1, while in the high initial arsenate concentrations, the highest arsenate removal efficiency was provided at low ferric chloride and ferric sulfate dose of 37 and 32 mg L-1, respectively. This study showed that Box-Behnken design and response surface methodology was reliable and effective in determining the optimum conditions for arsenic removal by coagulation and flocculation. (C) 2008 Elsevier B.V. All rights reserved.