Experimental study on the energy conversion of food waste via supercritical water gasification: Improvement of hydrogen production |
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| Affiliation: | 1. Institute of Energy and Power Engineering, Zhejiang University of Technology, Hangzhou 310014, China;2. Department of Chemical Engineering, Institut Teknologi Bandung, Bandung 40132, Indonesia;3. Center of Excellence in Environmental Catalysis and Adsorption, Thammasat University, Pathumthani 12120, Thailand;4. Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia;1. Department of Earth and Space Science and Engineering, York University, Ontario M3J 1P3, Canada;2. Department of Chemical and Biological Engineering, University of Saskatchewan, Saskatchewan S7N 5A9, Canada;1. State Key Laboratory of Multiphase Flow in Power Engineering, Xi''an Jiaotong University, Xi''an 710049, Shaanxi, China;2. School of Mechanical and Mining Engineering, University of Queensland, St Lucia, QLD 4072, Australia;3. Australian Institute for Bioengineering and Nanotechnology, University of Queensland, St Lucia, QLD 4072, Australia;4. School of Natural Sciences and Queensland Micro- and Nanotechnology Center, Nathan Campus, Griffith University, Brisbane 4111, Australia;1. Department of Earth and Space Science and Engineering, York University, Ontario, Canada;2. Department of Chemical Engineering, Indian Institute of Technology Roorkee, Uttarakhand, India;3. Department of Chemistry, York University, Ontario, Canada;4. Department of Chemical and Biological Engineering, University of Saskatchewan, Saskatchewan, Canada;1. College of Environment, Hohai University, Nanjing 210098, PR China;2. National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Hohai University, Nanjing, Jiangsu 210098, PR China |
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| Abstract: | In this study, the model food waste was gasified to hydrogen-rich syngas in a batch reactor under supercritical water condition. The model food consisted of rice, chicken, cabbage, and cooking oil. The effects of the main operating parameters including temperature (420–500 °C), residence time (20–60 min) and feedstock concentration (2–10 wt%) were investigated. Under the optimal condition at 500 °C, 2 wt% feedstock and 60 min residence time, the highest H2 yield of 13.34 mol/kg and total gas yield of 28.27 mol/kg were obtained from non-catalytic experiments. In addition, four commercial catalysts namely FeCl3, K2CO3, activated carbon, and KOH were employed to investigate the catalytic effect of additives at the optimal condition. The results showed that the highest hydrogen yield of 20.37 mol/kg with H2 selectivity of 113.19%, and the total gas yield of 38.36 mol/kg were achieved with 5 wt% KOH addition Moreover, the low heating value of gas products from catalytic experiments with KOH increased by 32.21% compared to the non-catalytic experiment. The catalytic performance of the catalysts can be ranked in descending order as KOH > activated carbon > FeCl3 > K2CO3. The supercritical water gasification (SCWG) with KOH addition can be a potential applied technology for food waste treatment with production of hydrogen-rich gases. |
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| Keywords: | Food waste Supercritical water Gasification Hydrogen Catalyst |
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