Influence of Hydraulic Pressure on Performance Deterioration of Direct Contact Membrane Distillation (DCMD) Process
Direct contact membrane distillation (DCMD) is a membrane distillation (MD) configuration where feed and distillate directly contact with a hydrophobic membrane. Depending on its operating conditions, the hydraulic pressures of the feed and distillate may be different, leading to adverse effects on...
| Hlavní autoři: | , |
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| Médium: | Článek |
| Jazyk: | English |
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MDPI AG
2019-03-01
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| Edice: | Membranes |
| Témata: | |
| On-line přístup: | http://www.mdpi.com/2077-0375/9/3/37 |
| _version_ | 1827852631824924672 |
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| author | Seung-Min Park Sangho Lee |
| author_facet | Seung-Min Park Sangho Lee |
| author_sort | Seung-Min Park |
| collection | DOAJ |
| description | Direct contact membrane distillation (DCMD) is a membrane distillation (MD) configuration where feed and distillate directly contact with a hydrophobic membrane. Depending on its operating conditions, the hydraulic pressures of the feed and distillate may be different, leading to adverse effects on the performance of the DCMD process. Nevertheless, little information is available on how hydraulic pressure affects the efficiency of DCMD. Accordingly, this paper investigates the effect of external hydraulic pressure on the process efficiency of DCMD. Gas permeabilities of MD membranes were measured to analyze the effect of membrane compaction by external pressure. Mass transfer coefficients were calculated using experimental data to quantitatively explain the pressure effect. Experiments were also carried out using a laboratory-scale DCMD set-up. After applying the pressure, the cross-sections and surfaces of the membranes were examined using a scanning electron microscope (SEM). Results showed that the membrane structural parameters such as porosity and thickness were changed under relatively high pressure conditions (>30 kPa), leading to reduction in flux. The mass transfer coefficients were also significantly influenced by the hydraulic pressure. Moreover, local wetting of the membranes were observed even below the liquid entry pressure (LEP), which decreased the rejection of salts. These results suggest that the control of hydraulic pressure is important for efficient operation of DCMD process. |
| first_indexed | 2024-03-12T10:52:56Z |
| format | Article |
| id | doaj.art-dbf1380b51cd475d92c45c80e46dd4e9 |
| institution | Directory Open Access Journal |
| issn | 2077-0375 |
| language | English |
| last_indexed | 2024-03-12T10:52:56Z |
| publishDate | 2019-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Membranes |
| spelling | doaj.art-dbf1380b51cd475d92c45c80e46dd4e92023-09-02T06:47:23ZengMDPI AGMembranes2077-03752019-03-01933710.3390/membranes9030037membranes9030037Influence of Hydraulic Pressure on Performance Deterioration of Direct Contact Membrane Distillation (DCMD) ProcessSeung-Min Park0Sangho Lee1Environmental Convergence Technology Center, Korea Testing Laboratory 87, Digital-ro 26-gil, Guro-gu, Seoul 08389, KoreaSchool of Civil and Environmental Engineering, Kookmin University, 861-1, Jeongneung-dong, Seongbuk-gu, Seoul 136-702, KoreaDirect contact membrane distillation (DCMD) is a membrane distillation (MD) configuration where feed and distillate directly contact with a hydrophobic membrane. Depending on its operating conditions, the hydraulic pressures of the feed and distillate may be different, leading to adverse effects on the performance of the DCMD process. Nevertheless, little information is available on how hydraulic pressure affects the efficiency of DCMD. Accordingly, this paper investigates the effect of external hydraulic pressure on the process efficiency of DCMD. Gas permeabilities of MD membranes were measured to analyze the effect of membrane compaction by external pressure. Mass transfer coefficients were calculated using experimental data to quantitatively explain the pressure effect. Experiments were also carried out using a laboratory-scale DCMD set-up. After applying the pressure, the cross-sections and surfaces of the membranes were examined using a scanning electron microscope (SEM). Results showed that the membrane structural parameters such as porosity and thickness were changed under relatively high pressure conditions (>30 kPa), leading to reduction in flux. The mass transfer coefficients were also significantly influenced by the hydraulic pressure. Moreover, local wetting of the membranes were observed even below the liquid entry pressure (LEP), which decreased the rejection of salts. These results suggest that the control of hydraulic pressure is important for efficient operation of DCMD process.http://www.mdpi.com/2077-0375/9/3/37direct contact membrane distillation (DCMD), hydrophobic membranehydraulic pressurecompactionmembrane structurewetting |
| spellingShingle | Seung-Min Park Sangho Lee Influence of Hydraulic Pressure on Performance Deterioration of Direct Contact Membrane Distillation (DCMD) Process Membranes direct contact membrane distillation (DCMD), hydrophobic membrane hydraulic pressure compaction membrane structure wetting |
| title | Influence of Hydraulic Pressure on Performance Deterioration of Direct Contact Membrane Distillation (DCMD) Process |
| title_full | Influence of Hydraulic Pressure on Performance Deterioration of Direct Contact Membrane Distillation (DCMD) Process |
| title_fullStr | Influence of Hydraulic Pressure on Performance Deterioration of Direct Contact Membrane Distillation (DCMD) Process |
| title_full_unstemmed | Influence of Hydraulic Pressure on Performance Deterioration of Direct Contact Membrane Distillation (DCMD) Process |
| title_short | Influence of Hydraulic Pressure on Performance Deterioration of Direct Contact Membrane Distillation (DCMD) Process |
| title_sort | influence of hydraulic pressure on performance deterioration of direct contact membrane distillation dcmd process |
| topic | direct contact membrane distillation (DCMD), hydrophobic membrane hydraulic pressure compaction membrane structure wetting |
| url | http://www.mdpi.com/2077-0375/9/3/37 |
| work_keys_str_mv | AT seungminpark influenceofhydraulicpressureonperformancedeteriorationofdirectcontactmembranedistillationdcmdprocess AT sangholee influenceofhydraulicpressureonperformancedeteriorationofdirectcontactmembranedistillationdcmdprocess |