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Arsenic (V) removal from groundwater by GE-HL nanofiltration membrane: effects of arsenic concentration, pH, and co-existing ions |
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| Authors: | Xiaowei Wang Wenjun Liu Desheng Li Weifang Ma |
| Institution: | 1. School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, China 2. Department of Environmental Science and Engineering, Tsinghua University, Beijing, 100084, China 3. School of Civil Engineering and Architecture, Beijing Jiaotong University, Beijing, 100044, China |
| Abstract: | A laboratory-scale investigation was performed to study arsenic (As (V)) removal by negatively charged GE-HL nanofiltration (NF) membrane in simulated drinking water. Effects of As (V) concentration (0–200 μg·L?1), pH, and co-ions and counter-ions were investigated. The NF membrane presented good stability, and the rejection rates exceeded 90%. The rejection rates of As (V) decreased with the increase of As (V) concentration, while it increased with the increase of pH (reached 96% at pH 6.75). Moreover, a negative relationship was observed between the co-existing ions of Cl?, Na+, SO 4 2? , and Ca2+ and the removal of As (V), in which bivalent ions presented more significant effects than monovalent ions. |
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