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Energy and exergy analyses of sewage sludge thermochemical treatment

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  • Atienza-Martínez, María
  • Ábrego, Javier
  • Mastral, José Francisco
  • Ceamanos, Jesús
  • Gea, Gloria

Abstract

The aim of this research was to provide a methodology for calculating the energy and exergy balances for the thermochemical treatment of sewage sludge. The results of the balances were assessed and compared for three different scenarios (torrefaction, pyrolysis and pyrolysis combined with catalytic post-treatment of the vapors). The balances were calculated based on previously published experimental data and evaluated under different conditions. The results indicated that the endothermicity decreased with the severity of the process. The energy recovery from the products favored the exothermicity of the processes. The three-step process (pyrolysis of torrefied sewage sludge combined with catalytic post-treatment of the hot vapors) was the least exergy efficient scenario.

Suggested Citation

  • Atienza-Martínez, María & Ábrego, Javier & Mastral, José Francisco & Ceamanos, Jesús & Gea, Gloria, 2018. "Energy and exergy analyses of sewage sludge thermochemical treatment," Energy, Elsevier, vol. 144(C), pages 723-735.
    • Handle: RePEc:eee:energy:v:144:y:2018:i:c:p:723-735
    DOI: 10.1016/j.energy.2017.12.007
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    5. Baghel, Paramjeet & Sakhiya, Anil Kumar & Kaushal, Priyanka, 2022. "Influence of temperature on slow pyrolysis of Prosopis Juliflora: An experimental and thermodynamic approach," Renewable Energy, Elsevier, vol. 185(C), pages 538-551.
    6. Yang, Qingchun & Zhang, Dawei & Zhou, Huairong & Zhang, Chenwei, 2018. "Process simulation, analysis and optimization of a coal to ethylene glycol process," Energy, Elsevier, vol. 155(C), pages 521-534.
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    8. Greco, Gianluca & Di Stasi, Christian & Rego, Filipe & González, Belén & Manyà, Joan J., 2020. "Effects of slow-pyrolysis conditions on the products yields and properties and on exergy efficiency: A comprehensive assessment for wheat straw," Applied Energy, Elsevier, vol. 279(C).
    9. Wilhelm Jan Tic & Joanna Guziałowska-Tic & Halina Pawlak-Kruczek & Eugeniusz Woźnikowski & Adam Zadorożny & Łukasz Niedźwiecki & Mateusz Wnukowski & Krystian Krochmalny & Michał Czerep & Michał Ostryc, 2018. "Novel Concept of an Installation for Sustainable Thermal Utilization of Sewage Sludge," Energies, MDPI, vol. 11(4), pages 1-17, March.
    10. Chaudhary, Amita & Lakhani, Jay & Dalsaniya, Priyank & Chaudhary, Prins & Trada, Akshit & Shah, Niraj K. & Upadhyay, Darshit S., 2023. "Slow pyrolysis of low-density Poly-Ethylene (LDPE): A batch experiment and thermodynamic analysis," Energy, Elsevier, vol. 263(PB).
    11. Eldredge, T.V., 2021. "The feasibility of solar assisted pyrolysis of sewer sludge and its potential for CO2 emissions reductions," Energy, Elsevier, vol. 226(C).
    12. Tang, Siqi & Zheng, Chunmiao & Yan, Feng & Shao, Ningning & Tang, Yuanyuan & Zhang, Zuotai, 2018. "Product characteristics and kinetics of sewage sludge pyrolysis driven by alkaline earth metals," Energy, Elsevier, vol. 153(C), pages 921-932.

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