Relationships among Permeability, Membrane Roughness, and Eukaryote Inhabitation during Submerged Gravity-Driven Membrane (GDM) Filtration
Gravity-driven membrane (GDM) filtration is one of the promising technologies for decentralized water treatment systems due to its low cost, simple operation, and convenient maintenance. The objective of this study was to evaluate the permeability of submerged GDM filtration with three different mem...
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MDPI AG
2020-11-01
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| author | Dongwhi Lee Yun Jeong Cha Youngbin Baek Shin Sik Choi Yunho Lee |
| author_facet | Dongwhi Lee Yun Jeong Cha Youngbin Baek Shin Sik Choi Yunho Lee |
| author_sort | Dongwhi Lee |
| collection | DOAJ |
| description | Gravity-driven membrane (GDM) filtration is one of the promising technologies for decentralized water treatment systems due to its low cost, simple operation, and convenient maintenance. The objective of this study was to evaluate the permeability of submerged GDM filtration with three different membranes, i.e., polyethersulfone and polyvinylidene difluoride ultrafiltration (PES-UF and PVDF-UF) and polytetrafluoroethylene microfiltration membrane (PTFE-MF). The GDM system was operated using lake water for about one year. The determined average permeability values were high for PVDF-UF (192.9 L/m<sup>2</sup>/h/bar (LMH/bar)) and PTFE-MF (80.6 LMH/bar) and relatively lower for PES-UF (46.1 LMH/bar). The observed higher permeability for PVDF-UF and PTFE-MF was thought to be related to the rougher surface of these two membranes compared to PES-UF. The fouling layers of PVDF-UF and PTFE-MF were characterized by high biomass and the presence of a number of nematodes, while PES-UF showed a thin fouling layer with no nematode. The relatively high and fluctuated permeability of PVDF-UF and PTFE-MF could thus be attributed to the high biological activity of nematodes making the fouling layer more loose and porous. This was supported by a good linear relationship among the permeability, biomass concentration, and the number of nematodes in the fouling layers. These results provide important insights into membrane selection as a critical factor affecting the flux performance of the GDM filtration system for a decentralized drinking water supply. |
| first_indexed | 2024-03-10T14:48:29Z |
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| language | English |
| last_indexed | 2024-03-10T14:48:29Z |
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| series | Applied Sciences |
| spelling | doaj.art-184bc94f28994adfafa88c6f176bcd492023-11-20T21:07:31ZengMDPI AGApplied Sciences2076-34172020-11-011022811110.3390/app10228111Relationships among Permeability, Membrane Roughness, and Eukaryote Inhabitation during Submerged Gravity-Driven Membrane (GDM) FiltrationDongwhi Lee0Yun Jeong Cha1Youngbin Baek2Shin Sik Choi3Yunho Lee4School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 500-712, KoreaDepartment of Food and Nutrition, College of Natural Science, Myongji University, Yongin, Gyeonggi 449-728, KoreaDepartment of Biotechnology, Sungshin Women’s University, Seoul 01133, KoreaDepartment of Food and Nutrition, College of Natural Science, Myongji University, Yongin, Gyeonggi 449-728, KoreaSchool of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 500-712, KoreaGravity-driven membrane (GDM) filtration is one of the promising technologies for decentralized water treatment systems due to its low cost, simple operation, and convenient maintenance. The objective of this study was to evaluate the permeability of submerged GDM filtration with three different membranes, i.e., polyethersulfone and polyvinylidene difluoride ultrafiltration (PES-UF and PVDF-UF) and polytetrafluoroethylene microfiltration membrane (PTFE-MF). The GDM system was operated using lake water for about one year. The determined average permeability values were high for PVDF-UF (192.9 L/m<sup>2</sup>/h/bar (LMH/bar)) and PTFE-MF (80.6 LMH/bar) and relatively lower for PES-UF (46.1 LMH/bar). The observed higher permeability for PVDF-UF and PTFE-MF was thought to be related to the rougher surface of these two membranes compared to PES-UF. The fouling layers of PVDF-UF and PTFE-MF were characterized by high biomass and the presence of a number of nematodes, while PES-UF showed a thin fouling layer with no nematode. The relatively high and fluctuated permeability of PVDF-UF and PTFE-MF could thus be attributed to the high biological activity of nematodes making the fouling layer more loose and porous. This was supported by a good linear relationship among the permeability, biomass concentration, and the number of nematodes in the fouling layers. These results provide important insights into membrane selection as a critical factor affecting the flux performance of the GDM filtration system for a decentralized drinking water supply.https://www.mdpi.com/2076-3417/10/22/8111gravity-driven membrane (GDM)permeabilitysurface roughnessnematodebiomass concentrationintermittent operation mode |
| spellingShingle | Dongwhi Lee Yun Jeong Cha Youngbin Baek Shin Sik Choi Yunho Lee Relationships among Permeability, Membrane Roughness, and Eukaryote Inhabitation during Submerged Gravity-Driven Membrane (GDM) Filtration Applied Sciences gravity-driven membrane (GDM) permeability surface roughness nematode biomass concentration intermittent operation mode |
| title | Relationships among Permeability, Membrane Roughness, and Eukaryote Inhabitation during Submerged Gravity-Driven Membrane (GDM) Filtration |
| title_full | Relationships among Permeability, Membrane Roughness, and Eukaryote Inhabitation during Submerged Gravity-Driven Membrane (GDM) Filtration |
| title_fullStr | Relationships among Permeability, Membrane Roughness, and Eukaryote Inhabitation during Submerged Gravity-Driven Membrane (GDM) Filtration |
| title_full_unstemmed | Relationships among Permeability, Membrane Roughness, and Eukaryote Inhabitation during Submerged Gravity-Driven Membrane (GDM) Filtration |
| title_short | Relationships among Permeability, Membrane Roughness, and Eukaryote Inhabitation during Submerged Gravity-Driven Membrane (GDM) Filtration |
| title_sort | relationships among permeability membrane roughness and eukaryote inhabitation during submerged gravity driven membrane gdm filtration |
| topic | gravity-driven membrane (GDM) permeability surface roughness nematode biomass concentration intermittent operation mode |
| url | https://www.mdpi.com/2076-3417/10/22/8111 |
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