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dc.contributor.authorChuah, Chong Yangen_US
dc.contributor.authorSiti Nurhawa Muhammad Anwaren_US
dc.contributor.authorWeerachanchai, Piyaraten_US
dc.contributor.authorBae, Tae-Hyunen_US
dc.contributor.authorGoh, Kunlien_US
dc.contributor.authorWang, Rongen_US
dc.identifier.citationChuah, C. Y., Siti Nurhawa Muhammad Anwar, Weerachanchai, P., Bae, T., Goh, K. & Wang, R. (2021). Scaling-up defect-free asymmetric hollow fiber membranes to produce oxygen-enriched gas for integration into municipal solid waste gasification process. Journal of Membrane Science, 640, 119787-.
dc.description.abstractMunicipal solid waste (MSW) gasification is an attractive waste-to-energy (WTE) technology with promise for future solid waste management, owing to the production of syngas which can be used as an alternative energy resource. However, quality of produced syngas is not meeting expectation. One promising solution is to use oxygen-enriched gas (OEG) to elevate produced syngas quality but producing OEG is costly. Herein, we demonstrated an asymmetric defect-free hollow fiber membrane made up of Matrimid® 5218 polyimide for scaling-up to 2-inch membrane modules. Our modules have an effective surface area up to 2.6 m2 with a packing density of up to 44% to produce OEG of 45% O2 purity. The 2-inch membrane module was integrated into a lab-scale gasification process to produce syngas using refuse derived fuel (RDF) generated from MSWs collected from the university campus. Prior to this, the lab-scale gasification was first optimized by tuning the gasification temperature, O2 purity and equivalence ratio (ER). Then, MSW gasification using membrane-based OEG was carried out, and compared against air gasification and synthetic OEG of the same O2 purity. Our results showed that, at O2 purity of 45%, gasification temperature of 900 °C and ER of 0.15, the quality of produced syngas was elevated with a lower heating value (LHV) of 9.15 MJ/m3 and H2/CO ratio of 1.43, which was substantially higher than air gasification with LHV and H2/CO ratio reported at 5.38 MJ/m3 and 0.81, respectively. Gasification results for membrane-based OEG and synthetic OEG were also comparable, while process simulation evidence suggested that membrane-based separation was at least 2-fold less energy-intensive than cryogenic distillation and pressure swing adsorption. Overall, this proof-of-concept successfully demonstrates the viability and competitiveness of membrane process for producing OEG at medium O2 purity (i.e., 40–50%) to support MSW gasification for WTE conversion.en_US
dc.description.sponsorshipEconomic Development Board (EDB)en_US
dc.description.sponsorshipMinistry of the Environment and Water Resourcesen_US
dc.description.sponsorshipNational Environmental Agency (NEA)en_US
dc.description.sponsorshipNational Research Foundation (NRF)en_US
dc.relationWTE CRP 1601 105en_US
dc.relation.ispartofJournal of Membrane Scienceen_US
dc.rights© 2021 Elsevier B.V. All rights reserved.en_US
dc.subjectEngineering::Environmental engineeringen_US
dc.titleScaling-up defect-free asymmetric hollow fiber membranes to produce oxygen-enriched gas for integration into municipal solid waste gasification processen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Civil and Environmental Engineeringen_US
dc.contributor.researchNanyang Environment and Water Research Instituteen_US
dc.contributor.researchSingapore Membrane Technology Centreen_US
dc.contributor.researchResidues and Resource Reclamation Centreen_US
dc.subject.keywordsHollow Fiber Membraneen_US
dc.subject.keywordsOxygen-Enriched Airen_US
dc.description.acknowledgementThis work is supported by the National Research Foundation, Prime Minister’s Office, Singapore, and the National Environment Agency, Ministry of the Environment and Water Resources, Singapore, under the Waste-to-Energy Competitive Research Programme (WTE CRP 1601105). We would also like to thank the Economic Development Board of Singapore for its funding support to Singapore Membrane Technology Centre.en_US
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