Ultrafiltration with intermittent relaxation using colloidal silica and humic acid as model foulants
Crossflow microfiltration and ultrafiltration are widely used in membrane bioreactors for wastewater treatment and applications in the food, biotechnology and process industries. Membrane fouling is an endemic problem in these operations that can be mitigated by backwashing and intermittent relaxati...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2021
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/147387 |
| _version_ | 1826114008470519808 |
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| author | Taheri, Amir Hooshang Sim, Lee Nuang Krantz, William B. Fane, Anthony Gordon |
| author2 | School of Computer Science and Engineering |
| author_facet | School of Computer Science and Engineering Taheri, Amir Hooshang Sim, Lee Nuang Krantz, William B. Fane, Anthony Gordon |
| author_sort | Taheri, Amir Hooshang |
| collection | NTU |
| description | Crossflow microfiltration and ultrafiltration are widely used in membrane bioreactors for wastewater treatment and applications in the food, biotechnology and process industries. Membrane fouling is an endemic problem in these operations that can be mitigated by backwashing and intermittent relaxation of the pressure or flux. Intermittent relaxation offers advantages relative to backwashing since it does not alter the membrane morphology or damage susceptible membranes, provides a more uniform removal of the foulant cake layer, and is potentially more energy-efficient. This paper reports a study of intermittent relaxation to mitigate fouling under both constant flux and constant pressure operation using a regenerated cellulose flat sheet ultrafiltration membrane (MWCO 30 kDa) and two model foulants: colloidal silica that is completely rejected and highly compressible and metastable; and, humic acid that is partially rejected and thereby can cause internal pore fouling and is relatively incompressible. Intermittent relaxation more effectively mitigated humic acid fouling owing to the compressibility and metastability of colloidal silica. An optimum relaxation frequency exists owing to the counterbalancing effects between increasing the permeation flux and reducing the time for permeation, which is determined for both constant flux and constant pressure operation. Design heuristics are advanced for the operation of intermittent relaxation. |
| first_indexed | 2024-10-01T03:32:29Z |
| format | Journal Article |
| id | ntu-10356/147387 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:32:29Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1473872021-03-31T01:55:55Z Ultrafiltration with intermittent relaxation using colloidal silica and humic acid as model foulants Taheri, Amir Hooshang Sim, Lee Nuang Krantz, William B. Fane, Anthony Gordon School of Computer Science and Engineering Nanyang Environment and Water Research Institute Singapore Membrane Technology Centre Engineering::Environmental engineering::Water treatment Membrane Fouling Water Treatment Crossflow microfiltration and ultrafiltration are widely used in membrane bioreactors for wastewater treatment and applications in the food, biotechnology and process industries. Membrane fouling is an endemic problem in these operations that can be mitigated by backwashing and intermittent relaxation of the pressure or flux. Intermittent relaxation offers advantages relative to backwashing since it does not alter the membrane morphology or damage susceptible membranes, provides a more uniform removal of the foulant cake layer, and is potentially more energy-efficient. This paper reports a study of intermittent relaxation to mitigate fouling under both constant flux and constant pressure operation using a regenerated cellulose flat sheet ultrafiltration membrane (MWCO 30 kDa) and two model foulants: colloidal silica that is completely rejected and highly compressible and metastable; and, humic acid that is partially rejected and thereby can cause internal pore fouling and is relatively incompressible. Intermittent relaxation more effectively mitigated humic acid fouling owing to the compressibility and metastability of colloidal silica. An optimum relaxation frequency exists owing to the counterbalancing effects between increasing the permeation flux and reducing the time for permeation, which is determined for both constant flux and constant pressure operation. Design heuristics are advanced for the operation of intermittent relaxation. Economic Development Board (EDB) Funding support from the Singapore Economic Development Board to the Singapore Membrane Technology Center is gratefully acknowledged. 2021-03-31T01:55:55Z 2021-03-31T01:55:55Z 2019 Journal Article Taheri, A. H., Sim, L. N., Krantz, W. B. & Fane, A. G. (2019). Ultrafiltration with intermittent relaxation using colloidal silica and humic acid as model foulants. Separation and Purification Technology, 212, 262-272. https://dx.doi.org/10.1016/j.seppur.2018.11.037 1383-5866 https://hdl.handle.net/10356/147387 10.1016/j.seppur.2018.11.037 2-s2.0-85056594348 212 262 272 en Separation and Purification Technology © 2018 Elsevier B.V. All rights reserved. |
| spellingShingle | Engineering::Environmental engineering::Water treatment Membrane Fouling Water Treatment Taheri, Amir Hooshang Sim, Lee Nuang Krantz, William B. Fane, Anthony Gordon Ultrafiltration with intermittent relaxation using colloidal silica and humic acid as model foulants |
| title | Ultrafiltration with intermittent relaxation using colloidal silica and humic acid as model foulants |
| title_full | Ultrafiltration with intermittent relaxation using colloidal silica and humic acid as model foulants |
| title_fullStr | Ultrafiltration with intermittent relaxation using colloidal silica and humic acid as model foulants |
| title_full_unstemmed | Ultrafiltration with intermittent relaxation using colloidal silica and humic acid as model foulants |
| title_short | Ultrafiltration with intermittent relaxation using colloidal silica and humic acid as model foulants |
| title_sort | ultrafiltration with intermittent relaxation using colloidal silica and humic acid as model foulants |
| topic | Engineering::Environmental engineering::Water treatment Membrane Fouling Water Treatment |
| url | https://hdl.handle.net/10356/147387 |
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