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Pretreatment strategies for enhanced biogas production from lignocellulosic biomass
Abraham, Amith,Mathew, Anil K.,Park, Hyojung,Choi, Okkyoung,Sindhu, Raveendran,Parameswaran, Binod,Pandey, Ashok,Park, Jung Han,Sang, Byoung-In Elsevier 2020 Bioresource technology Vol.301 No.-
<P><B>Abstract</B></P> <P>The inclusion of a pretreatment step in anaerobic digestion processes increases the digestibility of lignocellulosic biomass and enhances biogas yields by promoting lignin removal and the destruction of complex biomass structures. The increase in surface area enables the efficient interaction of microbes or enzymes, and a reduction in cellulose crystallinity improves the digestion process under anaerobic conditions. The pretreatment methods may vary based on the type of the lignocellulosic biomass, the nature of the subsequent process and the overall economics of the process. An improved biogas production by 1200% had been reported when ionic liquid used as pretreatment strategy for anaerobic digestion. The different pretreatment techniques used for lignocellulosic biomasses are generally grouped into physical, chemical, physicochemical, and biological methods. These four modes of pretreatment on lignocellulosic biomass and their impact on biogas production process is the major focus of this review article.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Lignocellulosic biomass is a potential source of renewable energy. </LI> <LI> Anaerobic digestion is an efficient process for sustainable energy production. </LI> <LI> Recalcitrance of lignocellulosic biomass is a major challenge for biogas/methane production. </LI> <LI> Different pretreatment strategies can improve biogas production from LC feedstock. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
이정엽,( Amith Abraham ),최옥경,상병인 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Bacterial cellulose (BC) has an advantage as an engineering material with excellent mechanical properties and purity. In particular, compared to the existing cellulose produced by pretreatment of wood, BC is a natural material produced by microorganisms and is an eco-friendly material that can be produced without destroying forests. The lack of technology to control BC's physical properties has been one of the reasons that has hindered its industrial use. This study reports that the physical properties of BC change as the carbon sources used for BC production by Komagataeibacter sucrofermentans DSM 15973 change. When it grew with four carbon sources; glucose, fructose, sucrose, and glycerol, the physical properties of BC, such as crystallinity, fiber morphology, specific surface area, thermal stability, and mechanical strength were compared.
Saehee LEE,Amith ABRAHAM,Alan CHRISTIAN S. LIM,Okkyoung CHOI,Jeong Gil SEO,Byoung-In SANG 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
Bacterial nanocellulose (BNC), a value-added biomaterial, has attracted attentions as an ideal precursor for nanostructured energy storage materials due to its fascinating features such as high purity, high crystallinity, and mechanical properties. However, the cost of BNC production is a challenge for its industrial applications. The present study used crude glycerol from the biodiesel industry as a carbon source for BNC production with Komagataeibacter sucrofermentans, and higher BNC production was observed in crude glycerol medium than glucose and pure glycerol media. BNC from crude glycerol medium showed a density of 0.92 g cm<SUP>-3</SUP> and a porosity of 38.6% as well as high crystallinity index (85%) and tensile strength (110 ㎫). The derived carbon materials by carbonization of BNC demonstrated highly porous structures and were evaluated for the supercapacitor application. This study showed the valorization of waste resources from the biodiesel industry to bio-nanomaterial and the potential of derived carbon as electrode materials for energy storage applications.
Power-to-gas systems with a focus on biological methanation
Seongcheol Kang,Anil Kuruvilla Mathew,Amith Abraham,Okkyoung Choi,Byoung-In Sang 한양대학교 청정에너지연구소 2022 Journal of Ceramic Processing Research Vol.23 No.6
Power to Gas (P2G) systems aim to store surplus renewable electricity generated in the form of gaseous fuels such as hydrogenor methane. The concept is ideal for storing the surplus energy for long periods in gaseous form and can be used in the futurefor desired end applications, i.e. either in gaseous form or electricity. In the P2G process, the surplus renewable energyconverts into methane (gaseous form) in a two-step process: electrolysis followed by methanation. The electrolysis process isused as the source for hydrogen generation, which further reduces carbon dioxide to produce methane. In this review, differentelectrolyzers and methanation processes are compared for the P2G process. The major process parameters and hydrogen gasliquid mass transfer are discussed by comparing different process conditions and reactor configurations used in biologicalmethanation. An understanding of the techno-economic analysis indicates that cost of the hydrogen generation is the key factorthat determines the overall economics of the P2G system. The cost of hydrogen generation is associated with the capital costof the electrolyzer and the cost of the electricity. It is expected that once this technology becomes mature, the economics of P2Gsystems will improve in the future.