The 4th International Conference on New Energy and Future Energy System
Plenary Speakers
Prof. Shijie Liu

Professor and Associate Chair
Department of Paper and Bioprocess Engineering
State University of New York
New York, USA

Abstract: As one of the most abundant polymers on earth, lignocellulosics or cellulose from woody biomass is an important industrial raw material and source of renewable energy. The enzymatic hydrolysis of cellulose pulp to glucose by cellulase is one of the major methods to convert lignocellulosic biomass to biofuel and biomaterials. Enzymatic hydrolysis, catalyzed by cellulase, is a heterogeneous reaction, which is influenced by characteristics of cellulose (e.g. crystallinity, the degree of polymerization and accessible surface area) and other biomass components (lignin and hemicellulose). In this study paulownia pulp, after hot-water pretreatment and delignification was utilized as the substrate while a preparatory commercial cellulase composed of endoglucanase, exo-glucanase, and β-glucosidase was employed as the catalyst. The effect of temperature and pH were investigated. In the temperature experiment, the highest yield of sugar was reached at 55°C in 72 hours. For the pH, the highest conversion was achieved at 4.8 in 96 hours. Kinetic studies were performed with different enzyme loadings. Proton NMR was used for the quantification of glucose and cellobiose. The highest glucose yield in 166 hours was found to be 62.5% at 18.5FPU/g while cellobiose remained at a low and relatively constant concentration during the process. A kinetic model was developed based on a proposed mechanism to explain the production of glucose. The hydrolysis rate was found to increase with increasing temperature at short reaction times, while decrease with increasing temperature at long reaction times.

photo: Damian Gorczany
Prof. Dr.-Ing. Hermann-Josef Wagner

Ruhr-University Bochum, Germany

Keynote speech title: Life cycle assessment of the offshore wind farm alpha ventus
Abstract: Due to better wind conditions at sea, offshore wind farms have the advantages of higher electricity production compared to onshore and inland wind farms. In contrast, a greater material input, leading to increased energy consumptions and emissions during the production phase, is required to build offshore wind farms. These contrary effects are investigated for the first German offshore wind farm alpha ventus in the North Sea. In a life cycle assessment, its environmental influence is compared to that of Germany’s electricity mix. In comparison to the existent electricity mix, in Germany alpha ventus had better indicators in nearly every investigated impact category. One kilowatt-hour electricity, generated by the wind farm, was burdened with 0,137 kWh Primary Energy-Equivalent and 32 g CO2-Equivalent, which represented only a small proportion of the accordant values for the mix. Furthermore, the offshore foundations as well as the submarine cable were the main energy intensive components. The energetic and greenhouse gas payback period was less than one year. Therefore, offshore wind power, even in deep water, is compatible with the switch to sustainable electricity production relying on renewable energies. It was the first published eco-balance for an offshore wind park worldwide.

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The 4th International Conference on New Energy and Future Energy System
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