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The increasing need for sustainable waste management solutions has driven the search for technologies that minimize environmental impacts while promoting resource recovery. Sewage sludge, a byproduct of wastewater treatment, poses significant challenges due to its high moisture content, complex composition, and disposal difficulties. In line with EU environmental policies that prioritize waste circularity and landfill reduction, plasma gasification emerges as a promising thermochemical conversion technology for transforming sewage sludge into a valuable energy resource. This study investigates plasma gasification as a viable method for sewage sludge treatment, focusing on mass and energy balances to evaluate process efficiency and syngas quality. The methodology includes physicochemical characterization of different sewage sludge samples, such as proximate and ultimate analyses, thermogravimetric assessments, and thermal conductivity measurements. A theoretical mass and energy balance model was developed based on the principles of mass and energy conservation, considering an Equivalence Ratio (ER) of 0.29, a commonly applied value in sewage sludge gasification. The results indicate that domestic sewage sludge presents a higher, lower heating value (LHV) and higher heating value (HHV) compared to other sludge types, making it a more suitable feedstock for plasma gasification. Additionally, its lower ash content contributes to a cleaner and more efficient conversion process. Theoretical energy balance calculations suggest an overall process efficiency of approximately 75%, demonstrating the potential of this technology for energy recovery. However, further experimental validation is required to optimize process parameters and assess real-world performance. In conclusion, plasma gasification offers a promising solution for sewage sludge management by reducing landfill dependency and generating syngas for energy applications. While the preliminary results highlight its feasibility, further research is needed to refine operational conditions, enhance system efficiency, and evaluate syngas composition under different scenarios. Future work will focus on validating theoretical models and optimizing key parameters to facilitate the large-scale application of this technology in wastewater treatment plants.

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Plasma Gasification of Sewage Sludge: Mass and Energy Balance

  • 会议论文

  • 发表日期：

    2026年

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  • N. Pacheco,
  • C. Castro,
  • M. Gonçalves,
  • L. Marques,
  • J. Carvalho,
  • C. Vilarinho

摘要

The increasing need for sustainable waste management solutions has driven the search for technologies that minimize environmental impacts while promoting resource recovery. Sewage sludge, a byproduct of wastewater treatment, poses significant challenges due to its high moisture content, complex composition, and disposal difficulties. In line with EU environmental policies that prioritize waste circularity and landfill reduction, plasma gasification emerges as a promising thermochemical conversion technology for transforming sewage sludge into a valuable energy resource. This study investigates plasma gasification as a viable method for sewage sludge treatment, focusing on mass and energy balances to evaluate process efficiency and syngas quality. The methodology includes physicochemical characterization of different sewage sludge samples, such as proximate and ultimate analyses, thermogravimetric assessments, and thermal conductivity measurements. A theoretical mass and energy balance model was developed based on the principles of mass and energy conservation, considering an Equivalence Ratio (ER) of 0.29, a commonly applied value in sewage sludge gasification. The results indicate that domestic sewage sludge presents a higher, lower heating value (LHV) and higher heating value (HHV) compared to other sludge types, making it a more suitable feedstock for plasma gasification. Additionally, its lower ash content contributes to a cleaner and more efficient conversion process. Theoretical energy balance calculations suggest an overall process efficiency of approximately 75%, demonstrating the potential of this technology for energy recovery. However, further experimental validation is required to optimize process parameters and assess real-world performance. In conclusion, plasma gasification offers a promising solution for sewage sludge management by reducing landfill dependency and generating syngas for energy applications. While the preliminary results highlight its feasibility, further research is needed to refine operational conditions, enhance system efficiency, and evaluate syngas composition under different scenarios. Future work will focus on validating theoretical models and optimizing key parameters to facilitate the large-scale application of this technology in wastewater treatment plants.