Energy Recovery from Municipal Sewage Sludge: Combustion Kinetics in a Varied Oxygen–Carbon Dioxide Atmosphere
Energy from municipal sewage sludge can be obtained by applying a thermal conversion method. In this study, the combustion kinetics of municipal sewage sludge were analyzed in an O<sub>2</sub>/CO<sub>2</sub> atmosphere. Studies were conducted in different gaseous atmospheres...
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2024-10-01
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| author | Jurand Bień Beata Bień |
| author_facet | Jurand Bień Beata Bień |
| author_sort | Jurand Bień |
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| description | Energy from municipal sewage sludge can be obtained by applying a thermal conversion method. In this study, the combustion kinetics of municipal sewage sludge were analyzed in an O<sub>2</sub>/CO<sub>2</sub> atmosphere. Studies were conducted in different gaseous atmospheres consisting of varying proportions of oxygen and carbon dioxide. The participation of oxygen was as follows: 20, 40, 60, 80 and 100% vol. The experimental temperatures varied from 873 to 1273 K. The experimentally obtained results helped establish the basic kinetic parameters, such as the reaction order n, factor Ko and activation energy E<sub>a</sub> of sludge grains. The values of the activation energy E<sub>a</sub> and K<sub>o</sub> were, respectively, 46 kJ/mol and 0.0127 mg/m<sup>2</sup>sPa. They show that the limiting factor of combustion is the diffusion of oxygen and that combustion reactions take place in the outer layer of the unreacted core. Therefore, sludge is promising for energy recovery because it has quite a high net calorific value (NCV) and a high gross calorific value (GCV). The GCV was 14.1 MJ/kg and the NCV was 12.8 MJ/kg. The experimental studies with a wide range of process parameters helped to create an array of apparent reaction rates as a function of the temperature and oxygen concentration, showing the significant effect of oxygen on the apparent reaction rate, in contrast to the effect of temperature. |
| format | Article |
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| institution | OA Journals |
| issn | 1996-1073 |
| language | English |
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| series | Energies |
| spelling | doaj-art-0ddc0edad7974da78c2c968ed879b8082025-08-20T02:14:15ZengMDPI AGEnergies1996-10732024-10-011721538210.3390/en17215382Energy Recovery from Municipal Sewage Sludge: Combustion Kinetics in a Varied Oxygen–Carbon Dioxide AtmosphereJurand Bień0Beata Bień1Faculty of Infrastructure and Environment, Czestochowa University of Technology, 42-200 Czestochowa, PolandFaculty of Infrastructure and Environment, Czestochowa University of Technology, 42-200 Czestochowa, PolandEnergy from municipal sewage sludge can be obtained by applying a thermal conversion method. In this study, the combustion kinetics of municipal sewage sludge were analyzed in an O<sub>2</sub>/CO<sub>2</sub> atmosphere. Studies were conducted in different gaseous atmospheres consisting of varying proportions of oxygen and carbon dioxide. The participation of oxygen was as follows: 20, 40, 60, 80 and 100% vol. The experimental temperatures varied from 873 to 1273 K. The experimentally obtained results helped establish the basic kinetic parameters, such as the reaction order n, factor Ko and activation energy E<sub>a</sub> of sludge grains. The values of the activation energy E<sub>a</sub> and K<sub>o</sub> were, respectively, 46 kJ/mol and 0.0127 mg/m<sup>2</sup>sPa. They show that the limiting factor of combustion is the diffusion of oxygen and that combustion reactions take place in the outer layer of the unreacted core. Therefore, sludge is promising for energy recovery because it has quite a high net calorific value (NCV) and a high gross calorific value (GCV). The GCV was 14.1 MJ/kg and the NCV was 12.8 MJ/kg. The experimental studies with a wide range of process parameters helped to create an array of apparent reaction rates as a function of the temperature and oxygen concentration, showing the significant effect of oxygen on the apparent reaction rate, in contrast to the effect of temperature.https://www.mdpi.com/1996-1073/17/21/5382sewage sludgeO<sub>2</sub>/CO<sub>2</sub> atmosphereenergy activationapparent reaction ratethermogravimetry |
| spellingShingle | Jurand Bień Beata Bień Energy Recovery from Municipal Sewage Sludge: Combustion Kinetics in a Varied Oxygen–Carbon Dioxide Atmosphere Energies sewage sludge O<sub>2</sub>/CO<sub>2</sub> atmosphere energy activation apparent reaction rate thermogravimetry |
| title | Energy Recovery from Municipal Sewage Sludge: Combustion Kinetics in a Varied Oxygen–Carbon Dioxide Atmosphere |
| title_full | Energy Recovery from Municipal Sewage Sludge: Combustion Kinetics in a Varied Oxygen–Carbon Dioxide Atmosphere |
| title_fullStr | Energy Recovery from Municipal Sewage Sludge: Combustion Kinetics in a Varied Oxygen–Carbon Dioxide Atmosphere |
| title_full_unstemmed | Energy Recovery from Municipal Sewage Sludge: Combustion Kinetics in a Varied Oxygen–Carbon Dioxide Atmosphere |
| title_short | Energy Recovery from Municipal Sewage Sludge: Combustion Kinetics in a Varied Oxygen–Carbon Dioxide Atmosphere |
| title_sort | energy recovery from municipal sewage sludge combustion kinetics in a varied oxygen carbon dioxide atmosphere |
| topic | sewage sludge O<sub>2</sub>/CO<sub>2</sub> atmosphere energy activation apparent reaction rate thermogravimetry |
| url | https://www.mdpi.com/1996-1073/17/21/5382 |
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