Arsenate removal using Donnan dialysis-zerovalent iron combined process |
| |
| Authors: | Bin ZHAO Nian LIU Hongli WANG Yiran QIAN Zhaohui ZHANG Liang WANG |
| |
| Affiliation: | 1.State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, China;2.School of Environmental Science and Engineering, Tiangong University, Tianjin 300387, China |
| |
| Abstract: | The Donnon dialysis-zerovalent iron combined process was developed by adding zerovalent iron into the stripping solution. The arsenic adsorption by the zerovalent iron corrosion products was able to regenerate the stripping solution in situ. Therefore, the long-term arsenic removal by the Donnan dialysis system was markedly improved. In this study, the effect of NaCl concentration in the desorption solution was determined to be 0.1 mol·L-1 based on the investigation of the effect of the NaCl concentration in the desorption solution on the arsenic removal performance of zero-valent iron. Then, the proposed Donnon dialysis-zerovalent iron combined process was used to treat arsenic containing well water for multiple batches, using stripping solution containing 6 g common salt and 5 g zerovalent iron per liter. The arsenic concentrations in the treated water was constantly below 50 μg·L-1 for 20 batches, much lower than the performance of the single Donnan dialysis system. The coupling of Donnan dialysis with zerovalent iron prolonged the interval for the stripping solution replacement; therefore, the practical application of the Donnan dialysis household water purifier was significantly improved. |
| |
| Keywords: | ion exchange adsorption regeneration zerovalent iron Donnan dialysis |
|
| 点击此处可从《化工学报》浏览原始摘要信息 |
|
点击此处可从《化工学报》下载免费的PDF全文 |
|
