Influences of operating parameters and membrane characteristics on the net energy production in dense, porous, and composite hollow fiber membrane contactors for dissolved biomethane recovery

Sethunga, G.S.M.D.P.; Lee, Jaewoo; Wang, Rong; Bae, Tae‐Hyun

doi:10.1016/j.memsci.2020.118301

Cited by 15 publications

(7 citation statements)

References 36 publications

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“…The presence of this top layer was probably responsible for the increase in hydrophobicity and likely to improve the wetting resistance of the membrane. The EDX analysis also showed the presence of Si (green dots in Figure 6d) from the silica precursor TEOS, located mainly in the top layer, but Si was also found in all the sections but at a lower concentration, as also reported in the literature [41]. Therefore, the condensation of silanols occurred mainly at the surface level [24].…”

Section: Structure and Chemical Composition Of The Modified Pvdfsupporting

confidence: 77%

Flat PVDF Membrane with Enhanced Hydrophobicity through Alkali Activation and Organofluorosilanisation for Dissolved Methane Recovery

et al. 2022

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A three-step surface modification consisting of activation with NaOH, functionalisation with a silica precursor and organofluorosilane mixture (FSiT), and curing was applied to a poly(vinylidene fluoride) (PVDF) membrane for the recovery of dissolved methane (D-CH4) from aqueous streams. Based on the results of a statistical experimental design, the main variables affecting the water contact angle (WCA) were the NaOH concentration and the FSiT ratio and concentration used. The maximum WCA of the modified PVDF (mPVDFmax) was >140° at a NaOH concentration of 5%, an FSiT ratio of 0.55 and an FSiT concentration of 7.2%. The presence of clusters and a lower surface porosity of mPVDF was detected by FESEM analysis. In long-term stability tests with deionised water at 21 L h−1, the WCA of the mPVDF decreased rapidly to around 105°, similar to that of pristine nmPVDF. In contrast, the WCA of the mPVDF was always higher than that of nmPVDF in long-term operation with an anaerobic effluent at 3.5 L h−1 and showed greater mechanical stability, since water breakthrough was detected only with the nmPVDF membrane. D-CH4 degassing tests showed that the increase in hydrophobicity induced by the modification procedure increased the D-CH4 removal efficiency but seemed to promote fouling.

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Section: Structure and Chemical Composition Of The Modified Pvdfsupporting

confidence: 77%

Flat PVDF Membrane with Enhanced Hydrophobicity through Alkali Activation and Organofluorosilanisation for Dissolved Methane Recovery

et al. 2022

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“…However, some contaminants exhibited lower removal efficiency than 50% (e.g., Ni 2+ : 44.4%; Cd 2+ : 42.8%), demonstrating a need for further improvement in removal efficiency. Moreover, high removal efficiency should be pursued, taking into account that the need for more environmentally friendly materials is growing as many countries have sought to attain a sustainable and green economy to overcome global climate change [ 89 , 90 ]. From the perspective of environmental sustainability, the toxic and volatile nature of some organic solvents (e.g., Dimethylformamide (DMF)) have propelled the development of bio-based polymers for membrane fabrication.…”

Section: Conclusive Remarksmentioning

confidence: 99%

Emerging Materials to Prepare Mixed Matrix Membranes for Pollutant Removal in Water

et al. 2021

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Various pollutants of different sizes are directly (e.g., water-borne diseases) and indirectly (e.g., accumulation via trophic transfer) threatening our water health and safety. To cope with this matter, multifaceted approaches are required for advanced wastewater treatment more efficiently. Wastewater treatment using mixed matrix membranes (MMMs) could provide an excellent alternative since it could play two roles in pollutant removal by covering adsorption and size exclusion of water contaminants simultaneously. This paper provides an overview of the research progresses and trends on the emerging materials used to prepare MMMs for pollutant removal from water in the recent five years. The transition of the research trend was investigated, and the most preferred materials to prepare MMMs were weighed up based on the research trend. Various application examples where each emerging material was used have been introduced along with specific mechanisms underlying how the better performance was realized. Lastly, the perspective section addresses how to further improve the removal efficiency of pollutants in an aqueous phase, where we could find a niche to spot new materials to develop environmentally friendly MMMs, and where we could further apply MMMs.

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“…This is due to the dominant effect of liquid phase resistance on the overall mass transfer [44]. Nevertheless, Mc Leod et al showed that when the G/L ratio is below a certain value, the gas phase mass transfer can play the major role in overall mass transfer [45]. The same observation was confirmed by a theoretical investigation by Sethunga et al, and they further revealed that the maximum outlet gas purity can be obtained with a lower G/L ratio reached by adjusting L rather than G [43].…”

Section: Influensive Parameters Of Hollow Fiber Mcs For D-ch 4 Recoverymentioning

confidence: 99%

Membrane Contactors for Maximizing Biomethane Recovery in Anaerobic Wastewater Treatments: Recent Efforts and Future Prospect

et al. 2021

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Increasing demand for water and energy has emphasized the significance of energy-efficient anaerobic wastewater treatment; however, anaerobic effluents still containing a large portion of the total CH4 production are discharged to the environment without being utilized as a valuable energy source. Recently, gas–liquid membrane contactors have been considered as a promising technology to recover such dissolved methane from the effluent due to their attractive characteristics such as high specific mass transfer area, no flooding at high flow rates, and low energy requirement. Nevertheless, the development and further application of membrane contactors were still not fulfilled due to their inherent issues such as membrane wetting and fouling, which lower the CH4 recovery efficiency and thus net energy production. In this perspective, the topics in membrane contactors for dissolved CH4 recovery are discussed in the following order: (1) operational principle, (2) potential as waste-to-energy conversion system, and (3) technical challenges and recent efforts to address them. Then, future efforts that should be devoted to advancing gas–liquid membrane contactors are suggested as concluding remarks.

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Influences of operating parameters and membrane characteristics on the net energy production in dense, porous, and composite hollow fiber membrane contactors for dissolved biomethane recovery

Cited by 15 publications

References 36 publications

Flat PVDF Membrane with Enhanced Hydrophobicity through Alkali Activation and Organofluorosilanisation for Dissolved Methane Recovery

Flat PVDF Membrane with Enhanced Hydrophobicity through Alkali Activation and Organofluorosilanisation for Dissolved Methane Recovery

Emerging Materials to Prepare Mixed Matrix Membranes for Pollutant Removal in Water

Membrane Contactors for Maximizing Biomethane Recovery in Anaerobic Wastewater Treatments: Recent Efforts and Future Prospect

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