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Arsenic (V) removal from groundwater by GE-HL
nanofiltration membrane: effects of arsenic concentration, pH, and
co-existing ions |
| Xiaowei WANG1,Wenjun LIU2,Weifang MA2,Desheng LI3, |
| 1.School of Environmental
and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070,
China；Department of Environmental
Science and Engineering, Tsinghua University, Beijing 100084, 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; |
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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+, SO42−, and Ca2+ and the removal of As (V), in which bivalent ions presented more significant effects than monovalent ions.
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| Keywords
nanofiltration (NF)
rejection rate
co-existing ion
co-ion
counter-ion
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Issue Date: 05 December 2009
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