Membrane distillation for high salinity desalination
Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2015.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2015
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| Online Access: | http://hdl.handle.net/1721.1/100061 |
| _version_ | 1826204663485038592 |
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| author | Chung, Hyung Won |
| author2 | John H. Lienhard, V. |
| author_facet | John H. Lienhard, V. Chung, Hyung Won |
| author_sort | Chung, Hyung Won |
| collection | MIT |
| description | Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2015. |
| first_indexed | 2024-09-23T12:59:01Z |
| format | Thesis |
| id | mit-1721.1/100061 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T12:59:01Z |
| publishDate | 2015 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/1000612019-04-12T09:33:41Z Membrane distillation for high salinity desalination MD for high salinity desalination Chung, Hyung Won John H. Lienhard, V. Massachusetts Institute of Technology. Department of Mechanical Engineering. Massachusetts Institute of Technology. Department of Mechanical Engineering. Mechanical Engineering. Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2015. This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections. Cataloged from student-submitted PDF version of thesis. Includes bibliographical references (pages 57-60). Membrane distillation systems typically have low energy efficiency. Multistage membrane distillation (MD) systems can have significantly higher efficiencies than their single stage counterparts. However, multistage MD system design has received limited attention. In this work, the performance of a multistage vacuum membrane distillation (MSVMD) which is thermodynamically similar to a multi-stage flash distillation (MSF) is evaluated for desalination, brine concentration, and produced water reclamation applications. A wide range of solution concentrations were accurately modeled by implementing Pitzer's equations for NaCl-solution properties. The viability of MSVMD use for zero liquid discharge (ZLD) applications is investigated, by considering discharge salinities close to NaCl saturation conditions. Energy efficiency (gained output ratio or GOR), second law efficiency, and the specific membrane area were used to quantify the performance of the system. At high salinities, the increased boiling point elevation of the feed stream resulted in lower fluxes, larger heating requirements and lower GOR values. The second law efficiency, however, is higher under these conditions since the least heat for separation increases faster than the system's specific energy consumption with increase in salinity. Under high salinity conditions, the relative significance of irreversible losses is lower. Results indicate that MSVMD systems can be as efficient as a conventional MSF system, while using reasonable membrane areas and for a wide range of feed salinities. Given MD's advantages over MSF such as lower capital requirement and scalability, MSVMD can be an attractive alternative to conventional thermal desalination systems. Recently proposed single stage MD systems have shown high energy efficiency. Permeate gap (PGMD) and conductive gap (CGMD) systems are studied in the context of energy efficiency. A wide range of salinities was considered to investigate potential of these single stage systems for high salinity desalination applications. by Hyung Won Chung. S.M. 2015-12-03T18:46:34Z 2015-12-03T18:46:34Z 2015 2015 Thesis http://hdl.handle.net/1721.1/100061 930149301 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 60 pages application/pdf Massachusetts Institute of Technology |
| spellingShingle | Mechanical Engineering. Chung, Hyung Won Membrane distillation for high salinity desalination |
| title | Membrane distillation for high salinity desalination |
| title_full | Membrane distillation for high salinity desalination |
| title_fullStr | Membrane distillation for high salinity desalination |
| title_full_unstemmed | Membrane distillation for high salinity desalination |
| title_short | Membrane distillation for high salinity desalination |
| title_sort | membrane distillation for high salinity desalination |
| topic | Mechanical Engineering. |
| url | http://hdl.handle.net/1721.1/100061 |
| work_keys_str_mv | AT chunghyungwon membranedistillationforhighsalinitydesalination AT chunghyungwon mdforhighsalinitydesalination |