Catalytic gasification of textile wastewater treatment sludge for hydrogen production in supercritical water with K2CO3/H2O2: Reaction variables,mechanism and kinetics |
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| Affiliation: | 1. College of Chemical, Fuzhou University, Fuzhou 350116, Fujian, China;2. Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou 350108, Fujian, China;3. Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, Fujian, China;4. Advanced Energy Science and Technology Guangdong Laboratory, 29 Sanxin North Road, Huizhou 116023, Guangdong, China;1. School of Chemical Engineering and Technology, Hainan University, Haikou 570228, China;2. Key Laboratory of Solid Waste Resource Utilization and Environmental Protection of Haikou City, Haikou 570228, China;3. Department of Chemistry, National University of Singapore, Singapore 119077, Singapore;1. Centre for Offshore Engineering and Safety Technology, China University of Petroleum, Qingdao 266580, China;2. Department of Building Environment and Energy Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China;3. School of Computer Science, China University of Geosciences, Wuhan, China |
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| Abstract: | As the main by-product, sludge was generated during the process of textile wastewater treatment. Due to containing organic compounds, textile sludge has great potential to be effectively reused for production of clean energy. In this work, gasification of textile sludge in supercritical water for hydrogen production was investigated. In order to improve hydrogen production, H2O2 and K2CO3 were used as catalysts. Effects of reaction variables (including temperature, retention time, oxidation coefficient and alkali catalyst dosage) on hydrogen yield were studied. Experimental results indicate that hydrogen yield increases with rise of temperature. When reaction temperature reaches 500 °C, the maximum value of hydrogen yield being 10.6 mol/kg was obtained. When excessive H2O2 was added, decrease of hydrogen yield was achieved. However, the addition of K2CO3 is favor to hydrogen yield, which is about 1.5 times as much as that of without catalyst. Meanwhile, reaction mechanism and kinetics of textile sludge gasification in supercritical water were explored. Reaction activation energy and Arrhenius constants were obtained in the established kinetic model. |
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| Keywords: | Supercritical water gasification Textile sludge Hydrogen production Alkali catalyst |
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