Fouling and mitigation mechanisms during direct microfiltration and ultrafiltration of primary wastewater
Direct membrane filtration (DMF) has recently gained attention as an alternative secondary biological wastewater treatment process. This study evaluated direct microfiltration (MF) and ultrafiltration (UF) performance and cleaning protocols during crossflow DMF of primary municipal wastewater efflue...
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ftnanyangtu:oai:dr.ntu.edu.sg:10356/159872 2023-05-15T16:48:48+02:00 Fouling and mitigation mechanisms during direct microfiltration and ultrafiltration of primary wastewater Hube, Selina Wang, Jingwei Sim, Lee Nuang Ólafsdóttir, Dagmar Chong, Tzyy Haur Wu, Bing School of Civil and Environmental Engineering Nanyang Environment and Water Research Institute Singapore Membrane Technology Centre 2021 https://hdl.handle.net/10356/159872 https://doi.org/10.1016/j.jwpe.2021.102331 en eng Journal of Water Process Engineering Hube, S., Wang, J., Sim, L. N., Ólafsdóttir, D., Chong, T. H. & Wu, B. (2021). Fouling and mitigation mechanisms during direct microfiltration and ultrafiltration of primary wastewater. Journal of Water Process Engineering, 44, 102331-. https://dx.doi.org/10.1016/j.jwpe.2021.102331 2214-7144 https://hdl.handle.net/10356/159872 doi:10.1016/j.jwpe.2021.102331 2-s2.0-85116485860 44 102331 © 2021 Elsevier Ltd. All rights reserved. Engineering::Environmental engineering Direct Membrane Filtration Fouling Mechanism Journal Article 2021 ftnanyangtu https://doi.org/10.1016/j.jwpe.2021.102331 2022-07-08T00:14:33Z Direct membrane filtration (DMF) has recently gained attention as an alternative secondary biological wastewater treatment process. This study evaluated direct microfiltration (MF) and ultrafiltration (UF) performance and cleaning protocols during crossflow DMF of primary municipal wastewater effluent. Several types of MF and UF membranes were examined by threshold flux determination, and two types of membranes (MF, 0.08 μm; UF, 100 kDa) were chosen for exploring membrane fouling mechanisms at different feed pressures via both fouling resistance analysis and optical coherence tomography (OCT) observation. The results revealed that both MF and UF displayed three-stage fouling behaviors, i.e., initial intermediate pore blocking followed by two-stage cake filtration. Increasing feed pressure from 8 kPa to 50 kPa could accelerate physically reversible fouling rate (consistent with simulated cake filtration constant). During physical flushing, the cake layer was more readily removed from the UF membrane; while residual porous cake layer was present on the MF membrane, regardless of the feed pressure. With extending filtration-cleaning cycle, shortening filtration duration and elevating cleaning solution temperature to from 25 °C to 50 °C benefited for irreversible fouling alleviation. At 50 °C, the geothermal water performed similar cleaning behaviors as clean water, facilitating lower reversible and irreversible fouling than the geothermal brine. This study shed light on the feasibility of using high temperature geothermal water for periodic physical cleaning during DMF of wastewater under Icelandic scenario. Economic Development Board (EDB) This work was supported by the University of Iceland Research Fund. The Student Innovation Fund from Rannís in Iceland was acknowledged for providing summer research grant to Dagmar Olafsd ´ ottir. The Economic Development Board (EDB) of Singapore is acknowledged for funding the Singapore MembraneTechnology Centre (SMTC) , Nanyang Technological University. Article in Journal/Newspaper Iceland DR-NTU (Digital Repository at Nanyang Technological University, Singapore) Journal of Water Process Engineering 44 102331 |
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Open Polar |
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DR-NTU (Digital Repository at Nanyang Technological University, Singapore) |
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ftnanyangtu |
language |
English |
topic |
Engineering::Environmental engineering Direct Membrane Filtration Fouling Mechanism |
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Engineering::Environmental engineering Direct Membrane Filtration Fouling Mechanism Hube, Selina Wang, Jingwei Sim, Lee Nuang Ólafsdóttir, Dagmar Chong, Tzyy Haur Wu, Bing Fouling and mitigation mechanisms during direct microfiltration and ultrafiltration of primary wastewater |
topic_facet |
Engineering::Environmental engineering Direct Membrane Filtration Fouling Mechanism |
description |
Direct membrane filtration (DMF) has recently gained attention as an alternative secondary biological wastewater treatment process. This study evaluated direct microfiltration (MF) and ultrafiltration (UF) performance and cleaning protocols during crossflow DMF of primary municipal wastewater effluent. Several types of MF and UF membranes were examined by threshold flux determination, and two types of membranes (MF, 0.08 μm; UF, 100 kDa) were chosen for exploring membrane fouling mechanisms at different feed pressures via both fouling resistance analysis and optical coherence tomography (OCT) observation. The results revealed that both MF and UF displayed three-stage fouling behaviors, i.e., initial intermediate pore blocking followed by two-stage cake filtration. Increasing feed pressure from 8 kPa to 50 kPa could accelerate physically reversible fouling rate (consistent with simulated cake filtration constant). During physical flushing, the cake layer was more readily removed from the UF membrane; while residual porous cake layer was present on the MF membrane, regardless of the feed pressure. With extending filtration-cleaning cycle, shortening filtration duration and elevating cleaning solution temperature to from 25 °C to 50 °C benefited for irreversible fouling alleviation. At 50 °C, the geothermal water performed similar cleaning behaviors as clean water, facilitating lower reversible and irreversible fouling than the geothermal brine. This study shed light on the feasibility of using high temperature geothermal water for periodic physical cleaning during DMF of wastewater under Icelandic scenario. Economic Development Board (EDB) This work was supported by the University of Iceland Research Fund. The Student Innovation Fund from Rannís in Iceland was acknowledged for providing summer research grant to Dagmar Olafsd ´ ottir. The Economic Development Board (EDB) of Singapore is acknowledged for funding the Singapore MembraneTechnology Centre (SMTC) , Nanyang Technological University. |
author2 |
School of Civil and Environmental Engineering Nanyang Environment and Water Research Institute Singapore Membrane Technology Centre |
format |
Article in Journal/Newspaper |
author |
Hube, Selina Wang, Jingwei Sim, Lee Nuang Ólafsdóttir, Dagmar Chong, Tzyy Haur Wu, Bing |
author_facet |
Hube, Selina Wang, Jingwei Sim, Lee Nuang Ólafsdóttir, Dagmar Chong, Tzyy Haur Wu, Bing |
author_sort |
Hube, Selina |
title |
Fouling and mitigation mechanisms during direct microfiltration and ultrafiltration of primary wastewater |
title_short |
Fouling and mitigation mechanisms during direct microfiltration and ultrafiltration of primary wastewater |
title_full |
Fouling and mitigation mechanisms during direct microfiltration and ultrafiltration of primary wastewater |
title_fullStr |
Fouling and mitigation mechanisms during direct microfiltration and ultrafiltration of primary wastewater |
title_full_unstemmed |
Fouling and mitigation mechanisms during direct microfiltration and ultrafiltration of primary wastewater |
title_sort |
fouling and mitigation mechanisms during direct microfiltration and ultrafiltration of primary wastewater |
publishDate |
2021 |
url |
https://hdl.handle.net/10356/159872 https://doi.org/10.1016/j.jwpe.2021.102331 |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
Journal of Water Process Engineering Hube, S., Wang, J., Sim, L. N., Ólafsdóttir, D., Chong, T. H. & Wu, B. (2021). Fouling and mitigation mechanisms during direct microfiltration and ultrafiltration of primary wastewater. Journal of Water Process Engineering, 44, 102331-. https://dx.doi.org/10.1016/j.jwpe.2021.102331 2214-7144 https://hdl.handle.net/10356/159872 doi:10.1016/j.jwpe.2021.102331 2-s2.0-85116485860 44 102331 |
op_rights |
© 2021 Elsevier Ltd. All rights reserved. |
op_doi |
https://doi.org/10.1016/j.jwpe.2021.102331 |
container_title |
Journal of Water Process Engineering |
container_volume |
44 |
container_start_page |
102331 |
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1766038893426114560 |