Influence of sludge properties on the direct gasification of dewatered sewage sludge in supercritical water |
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| Affiliation: | 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;3. Environmental Policy and Standard Research Department, Environmental Science Research and Design Institute of Zhejiang Province, Hangzhou, Zhejiang 310007, PR China;1. Química de Recursos Energéticos y Medio Ambiente, Instituto de Química, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia, UdeA – Colombia, Calle 70 No. 52-21, Medellín, Colombia;2. Sustainable Process Technology Group, Faculty of Science and Technology, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands;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;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;3. School of Civil Engineering, Hefei University of Technology, Hefei 230009, PR China;1. College of Environment, Hohai University, Nanjing 210098, PR China;2. Department of Earth and Space Science and Engineering, York University, Toronto, Ontario M3J 1P3, Canada;3. 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 the present study, ten different types of dewatered sewage sludges were treated in supercritical water in a high-pressure autoclave under a given condition (at 400 °C, 60 min and 23 MPa). The feasibility of direct gasification and the effect of sludge properties on the gasification of dewatered sewage sludge with various properties in supercritical water were investigated. The results showed that dewatered sewage sludge with various water contents (73.48–88.51 wt%), organic matter contents (29.25–73.02 wt%, on dry basis) and inorganics can be directly gasified in supercritical water. The total gas and phenol production increased linearly with the increment of organic matter content in dewatered sewage sludge. The difference in hydrogen content in the gaseous product may be related to the content of water and inorganic as well as pH value of the sludge. The char/coke formed in the solid residue increased with decrement of water content, which inhibited the gasification reaction and resulted in the carbonization reaction. |
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| Keywords: | Sludge property Supercritical water gasification Sewage sludge Phenol Char/coke |
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