Characterizing the scouring efficiency of Granular Activated Carbon (GAC) particles in membrane fouling mitigation via wavelet decomposition of accelerometer signals
Particle fluidization is a promising unsteady-state shear means of mitigating membrane fouling, thereby potentially lower the energy requirement in membrane-based water treatment processes. In particular, the particles facilitate back-transport in the polarization layer and also play the role of mec...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2017
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| Online Access: | https://hdl.handle.net/10356/82305 http://hdl.handle.net/10220/43499 |
| _version_ | 1824454541243842560 |
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| author | Wang, Jingwei Wu, Bing Yang, Shiliang Liu, Yu Chew, Jia Wei Fane, Anthony Gordon |
| author2 | School of Chemical and Biomedical Engineering |
| author_facet | School of Chemical and Biomedical Engineering Wang, Jingwei Wu, Bing Yang, Shiliang Liu, Yu Chew, Jia Wei Fane, Anthony Gordon |
| author_sort | Wang, Jingwei |
| collection | NTU |
| description | Particle fluidization is a promising unsteady-state shear means of mitigating membrane fouling, thereby potentially lower the energy requirement in membrane-based water treatment processes. In particular, the particles facilitate back-transport in the polarization layer and also play the role of mechanical scouring agents, the latter of which is dominant for millimeter-sized particles. In this study, the scouring efficacy of three Granular Activated Carbon (GAC) particle diameters (namely, 1.20 mm, 1.85 mm, and 2.18 mm) has been investigated using an accelerometer to reveal the fluid dynamics. Specifically, because both liquid and solid phases contribute to the accelerometer signal, wavelet decomposition was used to extract information in the higher-frequency detail signals that reflect the particle dynamics. The energy contained in the accelerometer signal indicative of the solid phase dynamics correlated well with the extent of fouling mitigation in the filtration tests; the liquid contribution was less significant when the GAC particles were fully fluidized. Results indicate that the smallest particle diameter of 1.20 mm conferred the least scouring efficiency, while both the larger particle diameters of 1.85 mm and 2.18 mm provided similar scouring efficiency. Calculations of energy requirement indicate that the energy requirement of all three particle diameters (dp) were similar at lower scouring efficiency, whereas the energy requirement of the smallest dp of 1.20 mm was the greatest at higher scouring efficiency. Optimization of the particle diameter hinges on the balance between particle inertia, and the difference between superficial liquid velocity and minimum fluidization velocity. |
| first_indexed | 2025-02-19T03:23:57Z |
| format | Journal Article |
| id | ntu-10356/82305 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-02-19T03:23:57Z |
| publishDate | 2017 |
| record_format | dspace |
| spelling | ntu-10356/823052020-09-26T22:03:06Z Characterizing the scouring efficiency of Granular Activated Carbon (GAC) particles in membrane fouling mitigation via wavelet decomposition of accelerometer signals Wang, Jingwei Wu, Bing Yang, Shiliang Liu, Yu Chew, Jia Wei Fane, Anthony Gordon School of Chemical and Biomedical Engineering School of Civil and Environmental Engineering Interdisciplinary Graduate School (IGS) Advanced Environmental Biotechnology Centre (AEBC) Nanyang Environment and Water Research Institute Singapore Membrane Technology Centre Liquid-solid fluidization Membrane fouling Particle fluidization is a promising unsteady-state shear means of mitigating membrane fouling, thereby potentially lower the energy requirement in membrane-based water treatment processes. In particular, the particles facilitate back-transport in the polarization layer and also play the role of mechanical scouring agents, the latter of which is dominant for millimeter-sized particles. In this study, the scouring efficacy of three Granular Activated Carbon (GAC) particle diameters (namely, 1.20 mm, 1.85 mm, and 2.18 mm) has been investigated using an accelerometer to reveal the fluid dynamics. Specifically, because both liquid and solid phases contribute to the accelerometer signal, wavelet decomposition was used to extract information in the higher-frequency detail signals that reflect the particle dynamics. The energy contained in the accelerometer signal indicative of the solid phase dynamics correlated well with the extent of fouling mitigation in the filtration tests; the liquid contribution was less significant when the GAC particles were fully fluidized. Results indicate that the smallest particle diameter of 1.20 mm conferred the least scouring efficiency, while both the larger particle diameters of 1.85 mm and 2.18 mm provided similar scouring efficiency. Calculations of energy requirement indicate that the energy requirement of all three particle diameters (dp) were similar at lower scouring efficiency, whereas the energy requirement of the smallest dp of 1.20 mm was the greatest at higher scouring efficiency. Optimization of the particle diameter hinges on the balance between particle inertia, and the difference between superficial liquid velocity and minimum fluidization velocity. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) Accepted version 2017-07-31T04:56:18Z 2019-12-06T14:52:56Z 2017-07-31T04:56:18Z 2019-12-06T14:52:56Z 2015 Journal Article Wang, J., Wu, B., Yang, S., Liu, Y., Fane, A. G., & Chew, J. W. (2016). Characterizing the scouring efficiency of Granular Activated Carbon (GAC) particles in membrane fouling mitigation via wavelet decomposition of accelerometer signals. Journal of Membrane Science, 498, 105-115. 0376-7388 https://hdl.handle.net/10356/82305 http://hdl.handle.net/10220/43499 10.1016/j.memsci.2015.09.061 en Journal of Membrane Science © 2015 Elsevier. This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of Membrane Science, Elsevier. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1016/j.memsci.2015.09.061]. 24 p. application/pdf |
| spellingShingle | Liquid-solid fluidization Membrane fouling Wang, Jingwei Wu, Bing Yang, Shiliang Liu, Yu Chew, Jia Wei Fane, Anthony Gordon Characterizing the scouring efficiency of Granular Activated Carbon (GAC) particles in membrane fouling mitigation via wavelet decomposition of accelerometer signals |
| title | Characterizing the scouring efficiency of Granular Activated Carbon (GAC) particles in membrane fouling mitigation via wavelet decomposition of accelerometer signals |
| title_full | Characterizing the scouring efficiency of Granular Activated Carbon (GAC) particles in membrane fouling mitigation via wavelet decomposition of accelerometer signals |
| title_fullStr | Characterizing the scouring efficiency of Granular Activated Carbon (GAC) particles in membrane fouling mitigation via wavelet decomposition of accelerometer signals |
| title_full_unstemmed | Characterizing the scouring efficiency of Granular Activated Carbon (GAC) particles in membrane fouling mitigation via wavelet decomposition of accelerometer signals |
| title_short | Characterizing the scouring efficiency of Granular Activated Carbon (GAC) particles in membrane fouling mitigation via wavelet decomposition of accelerometer signals |
| title_sort | characterizing the scouring efficiency of granular activated carbon gac particles in membrane fouling mitigation via wavelet decomposition of accelerometer signals |
| topic | Liquid-solid fluidization Membrane fouling |
| url | https://hdl.handle.net/10356/82305 http://hdl.handle.net/10220/43499 |
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