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Shabina Yeasmin,Chul-Hawn Kim,J-Y Lee,M. I. Sheikh,H-J Park,S-H Kim,G-C Kim,J-W Kim 한국펄프·종이공학회 2011 한국펄프·종이공학회 학술발표논문집 Vol.2011 No.4
The experiment was conducted to evaluate the different NaOH pretreatment concentrations (0.25%, 0.50%, 0.75%, and 1.00%) on enzymatic saccharification (with cellulase, and β-glucosidase) and fermentation (by Saccharomyces cerevisiaeKCCM 11304) for bioethanol production from rice straw and rice husk. Pretreatment of rice straw and rice husk were conducted under both natural and powder state to observe the potentiality of the biomass condition (natural and powder state). In this study, glucose and ethanol production were increased with the increase of NaOH percentage for both rice straw and rice husk (natural and powder state). For rice straw, the highest amount of glucose was obtained in 1.00% NaOH pretreatment (0.81 g g?¹ in a natural, and 0.63 g g?¹ in a powder state pretreatment). Similarly, for rice husk, the highest amount of glucose was obtained in 1.00% NaOH pretreatment (0.47 g g?¹ in a natural, and 0.46 g g?¹ lin a powder state pretreatment). However, 0.75% NaOH pretreatment resulted in glucose yield near about 1.00% NaOH pretreatment for both rice straw and rice husk (natural and powder state). On the other hand, for rice straw, the highest amount of ethanol was obtained in 1.00% NaOH pretreatment (0.36 g g?¹ in a natural, and 0.31 g g?¹ in a powder state pretreatment). In addition, for rice husk, the highest amount of ethanol was also obtained in 1.00% NaOH pretreatment (0.24 g g?¹ in a natural, and 0.23 g g?¹ in a powder state pretreatment). Moreover, 0.75% NaOH pretreatment resulted in ethanol yield near about 1.00% NaOH pretreatment for both rice straw and rice husk (natural and powder state). It was confirmed that higher amount of NaOH use is cost effective. Moreover, higher amount of glucose and ethanol was observed when powder was prepared after pretreatment. So 0.75% NaOH pretreatment in a natural state is supposed to be suitable for enzymatic saccharification and fermentation for bioethanol production.
Conversion of bioethanol from old paper money bill by separate hydrolysisand fermentation
Shabina Yeasmin,Chul-Hawn Kim,Mominul Islam Sheikh,Hyun-Jin Park,Sung-Ho Kim,Jee-Young Lee 한국펄프·종이공학회 2010 한국펄프·종이공학회 학술발표논문집 Vol.2010 No.10
Paper money billis believed to be one of the mostpromising feedstock for near-term commercial application oftechnology for converting cellulosic raw materials intocommodity products. In this study, we conducted saccharification of waste papermoney using cellulase and β-glucosidase enzyme. Finally, we carried fermentation of paper money glucose by Saccharomyces cerevisiae KCCM 11304. By the separate hydrolysis and fermentation, we got 0.65 ㎎/g ethanol. Paper money can be used for simultaneous saccharification and fermentation.
김성호,김철환,안병일,이지영,Md. Momin,Shabina Yeasmin 한국펄프·종이공학회 2011 한국펄프·종이공학회 학술발표논문집 Vol.2011 No.4
During the last decades, global warming from the increased amount of greenhouse gases, mainly carbon dioxide has become a major political and scientific issue. Burning fossil fuels (natural gas, coal and oil) releases CO₂, which is also a major cause of global warming. Among the clean environment, wood pellets are considered as promising renewable fossil fuels because of clean burning characteristics, reduction of particulate and NOx emission from combustion. In Korea, more than 50% pellets have to be imported every year because of shortage of feedstocks. On the other hand, about 80% of wood pulps are greatly dependent upon overseas products due to limited forest resources. Under this situation, this study explored how efficiently we have to use forest biomass instead of total dependence on wood as raw materials for pellets.
Mominul Islam Sheikh,Chul-Hawn Kim,Shabina Yeasmin,Hyun-Jin Park,Sung-Ho Kim,Jee-Young Lee 한국펄프·종이공학회 2010 한국펄프·종이공학회 학술발표논문집 Vol.2010 No.10
Increased acceptance of climate change iscreated by human activities and raising oil demand with insecure deliverance obliges the searching for alternative fuels. Therefore, in recent years biofuel has emerged as mostimportant alternative resource for liquid fuel and has generated a great deal of research interestin biofuel fermentation.This paper reports a preliminary study on the chemical pretreatment, microbial saccharification and fermentation of the agricultural leftovers like rice husk,rice straw and industrial wastes like paper money sludge.A combination of sodium hypochlorite (NaClO) and hydrogen peroxide (H₂O₂) were used for pretreatment, cellulase from Trichodermareesei ATCC 26921 and Novozymes 188 for saccharification, and Saccharomyces cerevisiae KCCM 11304 were used for carrying out fermentation in an aerobic condition.Rice husk, rice straw and paper money sludge resulted in biofuel yield 0.45 ㎎/g, 0. 52 ㎎/g &1.26 ㎎/g respectively. Firstly, the objective of this study is to produce biofuel from raw materials which will treat with various combinations of the microbial strains after screening, and secondly, to reduce dependency on foreign oiland to remove disposal problem of wastes andmake environment safe from pollution.
김경철,김철환,안병일,이지영,Md. Mominul Islam Sheikh,Shabina Yeasmin 한국펄프·종이공학회 2011 한국펄프·종이공학회 학술발표논문집 Vol.2011 No.4
In the world, burning fossil fuels such as oil, petroleum, gasoline has created the global warming due to especially carbon dioxide gas emission. Therefore, these fossil fuels must be replaced by eco-friendly feadstocks. The wood pellets are one of valuable alternative fuels that can replace oil-based fuels within a short period of time. Unfortunately, there are no enough forest biomass for wood pellets in Korea. Nevertheless, Korea government has been trying to use most of forest biomass generated from the National Forest Management Operation. This does not make sense in an economic point of view.
M. Mominul Islam Sheikh,Chul-Hwan Kim,Ji-Yong Lee,Shabina Yeasmin,Hyeon-Jin Park,Gyeong-Chul Kim,Sung-Ho Kim,Jae-Won Kim 한국펄프·종이공학회 2011 한국펄프·종이공학회 학술발표논문집 Vol.2011 No.4
Current fuel ethanol research and development deals with process engineering trends for improving biotechnological production of ethanol. Recently, a large amount of studies regarding the utilization of lignocellulosic biomass as a good feedstock for producing fuel ethanol is being carried out worldwide. The plant biomass is mainly composed of cellulose, hemicellulose and lignin. The main challenge in the conversion of biomass into ethanol is the complex, rigid and harsh structures which require efficient process and cost effective to break down. The isolation of microorganisms is one of the means for obtaining enzymes with properties suitable for industrial applications. For these reasons, crude cultures containingcellulosic biomass degrading microorganismswere isolated from rice field soil, cow farm soil and rotten rice straw from cow farm. Carboxymethyl cellulose (CMC), xylan and Avicel (microcrystalline cellulose) degradation zone of clearance on agar platefrom rice field soil resulted approximately at 25 ㎜, 24 ㎜ and 22 ㎜ respectively. As for cow farm soil, CMC, xylan and Avicel degradation clearancezone on agar plateresulted around at 24㎜, 23㎜ and 21 ㎜ respectively. Rotten rice straw from cow farm also resulted for CMC, xylan and Avicel degradation zone almost at 24 ㎜, 23 ㎜ and 22 ㎜ respectively. The objective of this study is to isolatebiomass degrading microbial strains having good efficiency in cellulose hydrolysisandobserved the effects of different substrates (CMC, xylan and Avicel) on the production of cellulase enzymes (endo-glucanase, exo-glucanase, cellobiase, xylanase and avicelase) for producing low cost biofuel from cellulosic materials.
박현진,김철환,안병일,이지영,MD Mominul Islam Sheikh,Shabina Yeasmin,곽혜정,김성호,김경철 한국펄프·종이공학회 2011 한국펄프·종이공학회 학술발표논문집 Vol.2011 No.4
Currently, many forest residues have been generated by the National Forest Management Operation. Unfortunately, most of the forest residues are supposed to be used as raw materials for burning fuels like wood pellets. Even though the forest biomass must be effectively used for making high value-added products, they may be subject to disposable raw materials for wood pellets. Wood pellets are regarded as burning fuels with less contribution to the decrease in carbon gas emission, compared to raw materials for kraft pulps. In this study, we studied whether or not forest biomass mixed with various ages and, species could be used as raw materials for kraft pulps.