Pilot-Scale Selective Electrodialysis for the Separation of Chloride and Sulphate from High-Salinity Wastewater
The separation of chloride and sulphate is important for the treatment of high salt wastewater, and monovalent selective electrodialysis (MSED) has advantages in terms of energy consumption and pre-treatment costs compared to nanofiltration salt separation. Most of the research on monovalent anion-s...
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MDPI AG
2022-06-01
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| Series: | Membranes |
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| Online Access: | https://www.mdpi.com/2077-0375/12/6/610 |
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| author | Fuqin Li Yanfu Guo Shaozhou Wang |
| author_facet | Fuqin Li Yanfu Guo Shaozhou Wang |
| author_sort | Fuqin Li |
| collection | DOAJ |
| description | The separation of chloride and sulphate is important for the treatment of high salt wastewater, and monovalent selective electrodialysis (MSED) has advantages in terms of energy consumption and pre-treatment costs compared to nanofiltration salt separation. Most of the research on monovalent anion-selective membranes (MASM) is still on a laboratory scale due to the preparation process, cost, and other reasons. In this study, a low-cost, easy-to-operate modification scheme was used to prepare MASM, which was applied to assemble a pilot-scale electrodialysis device to treat reverse osmosis concentrated water with a salt content of 4% to 5%. The results indicate that the optimum operating conditions for the device are: 250 L/h influent flow rate for the concentration and dilute compartments, 350 L/h influent flow rate for the electrode compartment and a constant voltage of 20 V. The separation effect of the pilot electrodialysis plant at optimal operating conditions was: the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>C</mi><msup><mi>l</mi><mo>−</mo></msup></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>S</mi><msubsup><mi>O</mi><mn>4</mn><mrow><mn>2</mn><mo>−</mo></mrow></msubsup></mrow></semantics></math></inline-formula> transmission rates of 80% and 2.54% respectively, the separation efficiency (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>S</mi></semantics></math></inline-formula>) of 93.85% and the Energy consumption per unit of NaCl (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>E</mi><mrow><mi>N</mi><mi>a</mi><mi>C</mi><mi>l</mi></mrow></msub></mrow></semantics></math></inline-formula>) of 0.344 kWh/kg. The analysis of the variation of the three parameters of selective separation performance during electrodialysis indicates that the separation efficiency (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>S</mi></semantics></math></inline-formula>) is a suitable parameter for measuring the selective separation performance of the device compared to the monovalent selectivity coefficient (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msubsup><mi>P</mi><mrow><mi>S</mi><msubsup><mi>O</mi><mn>4</mn><mrow><mn>2</mn><mo>−</mo></mrow></msubsup></mrow><mrow><mi>C</mi><msup><mi>l</mi><mo>−</mo></msup></mrow></msubsup></mrow></semantics></math></inline-formula>). |
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| publishDate | 2022-06-01 |
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| spelling | doaj.art-941b4798887c4a4faed6932fce878da22023-11-23T17:54:45ZengMDPI AGMembranes2077-03752022-06-0112661010.3390/membranes12060610Pilot-Scale Selective Electrodialysis for the Separation of Chloride and Sulphate from High-Salinity WastewaterFuqin Li0Yanfu Guo1Shaozhou Wang2School of Energy and Environmental Engineering, Hebei University of Engineering, Handan 056038, ChinaSchool of Energy and Environmental Engineering, Hebei University of Engineering, Handan 056038, ChinaSchool of Energy and Environmental Engineering, Hebei University of Engineering, Handan 056038, ChinaThe separation of chloride and sulphate is important for the treatment of high salt wastewater, and monovalent selective electrodialysis (MSED) has advantages in terms of energy consumption and pre-treatment costs compared to nanofiltration salt separation. Most of the research on monovalent anion-selective membranes (MASM) is still on a laboratory scale due to the preparation process, cost, and other reasons. In this study, a low-cost, easy-to-operate modification scheme was used to prepare MASM, which was applied to assemble a pilot-scale electrodialysis device to treat reverse osmosis concentrated water with a salt content of 4% to 5%. The results indicate that the optimum operating conditions for the device are: 250 L/h influent flow rate for the concentration and dilute compartments, 350 L/h influent flow rate for the electrode compartment and a constant voltage of 20 V. The separation effect of the pilot electrodialysis plant at optimal operating conditions was: the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>C</mi><msup><mi>l</mi><mo>−</mo></msup></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>S</mi><msubsup><mi>O</mi><mn>4</mn><mrow><mn>2</mn><mo>−</mo></mrow></msubsup></mrow></semantics></math></inline-formula> transmission rates of 80% and 2.54% respectively, the separation efficiency (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>S</mi></semantics></math></inline-formula>) of 93.85% and the Energy consumption per unit of NaCl (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>E</mi><mrow><mi>N</mi><mi>a</mi><mi>C</mi><mi>l</mi></mrow></msub></mrow></semantics></math></inline-formula>) of 0.344 kWh/kg. The analysis of the variation of the three parameters of selective separation performance during electrodialysis indicates that the separation efficiency (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>S</mi></semantics></math></inline-formula>) is a suitable parameter for measuring the selective separation performance of the device compared to the monovalent selectivity coefficient (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msubsup><mi>P</mi><mrow><mi>S</mi><msubsup><mi>O</mi><mn>4</mn><mrow><mn>2</mn><mo>−</mo></mrow></msubsup></mrow><mrow><mi>C</mi><msup><mi>l</mi><mo>−</mo></msup></mrow></msubsup></mrow></semantics></math></inline-formula>).https://www.mdpi.com/2077-0375/12/6/610high-salinity wastewatermonovalent selective electrodialysispilot-scale devicechloride and sulphate separation |
| spellingShingle | Fuqin Li Yanfu Guo Shaozhou Wang Pilot-Scale Selective Electrodialysis for the Separation of Chloride and Sulphate from High-Salinity Wastewater Membranes high-salinity wastewater monovalent selective electrodialysis pilot-scale device chloride and sulphate separation |
| title | Pilot-Scale Selective Electrodialysis for the Separation of Chloride and Sulphate from High-Salinity Wastewater |
| title_full | Pilot-Scale Selective Electrodialysis for the Separation of Chloride and Sulphate from High-Salinity Wastewater |
| title_fullStr | Pilot-Scale Selective Electrodialysis for the Separation of Chloride and Sulphate from High-Salinity Wastewater |
| title_full_unstemmed | Pilot-Scale Selective Electrodialysis for the Separation of Chloride and Sulphate from High-Salinity Wastewater |
| title_short | Pilot-Scale Selective Electrodialysis for the Separation of Chloride and Sulphate from High-Salinity Wastewater |
| title_sort | pilot scale selective electrodialysis for the separation of chloride and sulphate from high salinity wastewater |
| topic | high-salinity wastewater monovalent selective electrodialysis pilot-scale device chloride and sulphate separation |
| url | https://www.mdpi.com/2077-0375/12/6/610 |
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