Comparison of nanofiltration and adsorption techniques to remove arsenic from drinking water
Comparison of nanofiltration and adsorption techniques to remove arsenic from drinking water
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DOI：
10.5004/dwt.2009.765
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发表时间：
2009-09-01
影响因子：
1.1
通讯作者：
Kinaci, C.
中科院分区：
文献类型：
--
作者：
Cakmakci, M.;Baspinar, A. B.;Kinaci, C.
砷天然存在于地下水和地表水中，由于对人体的致癌作用，不希望在饮用水中存在。砷的常见类型是砷酸盐（As V）和亚砷酸盐（As III）。虽然砷的去除已经通过膜、吸附、离子交换和混凝实现，但砷的去除难以将浓度降低到标准水平（低于10 μ g/L）。在这项研究中，纳滤（NF）和吸附技术进行了比较，以去除饮用水中的砷。在纳滤研究中，研究了不同纳滤膜和亚砷酸盐进料浓度对纳滤的影响。合成制备给水，并将具有平板膜池的实验室规模的错流模式过滤装置用于NF实验。在颗粒氢氧化铁（GIH）的吸附实验中，所有的研究都在自由水流和自来水的正常pH值下进行。结果表明，吸附法可使砷浓度降至1.0 μ g/L以下。这些结果表明，GIH吸附可用于去除供水中的砷浓度为0.1和0.5 g/L。
Arsenic occurs naturally in the ground and surface water and is not desired in the drinking water due to carcinogenic effect on human body. The common types of arsenic are arsenate (As V) and arsenite (As III). Although arsenate removal has been achieved by membranes, adsorption, ion exchange and coagulation, arsenite removal is difficult to decrease the concentration up to the standard level (below to 10 mu g/L). In this study, nanofiltration (NF) and adsorption techniques have been compared to remove arsenite from drinking water. In nanofiltration study, different NF membranes and arsenite feed concentrations have been Studied. Feed water was prepared synthetically and laboratory scale cross-flow mode filtration apparatus with a flat-sheet membrane cell was used for NF experiments. In the adsorption experiments with granular iron hydroxide (GIH), all studies were performed in the free water flow and at the normal pH of tap water. It was concluded that arsenite concentration was lowered to below 1.0 mu g/L with adsorption. These results showed that GIH adsorption can be used to remove arsenite concentration of 0.1 and 0.5 g/L from water supplies.