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Sustainable co-valorization of medical waste and biomass waste: Innovative process design, optimization and assessment

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  • Zhou, Jianzhao
  • Ayub, Yousaf
  • Shi, Tao
  • Ren, Jingzheng
  • He, Chang

Abstract

A novel co-valorization process integrating plasma gasification and Fischer-Tropsch synthesis is designed for converting medical waste (MW) and biomass waste (BMW) into mixed e-fuels where the additional required hydrogen is supplied by solar-based electrolysis. Optimization and comprehensive assessments have been conducted for three scenarios with different ratios of BMW. Operations optimization based on genetic algorithm (GA) has led to a remarkable enhancement in the quality of syngas, with a more than 10% increase in H2 mole fraction. Techno-economic analysis reveals the net present values (NPVs) of three scenarios are −2.56 MM$, 3.38 MM$ and 40.1 MM$ with internal rates of return of 3.4 %, 9.5 % and 14.0 %. By improving the subside of MW treatment, the economic viabilities of all scenarios have been enhanced significantly with higher positive NPVs. Environmental assessment shows ∼2.5 kg eqCO2/kg waste and ∼0.1 g eqCO2 per MJ fuel have been generated across the system boundary and the operation of the designed process has been identified to be the largest source of emissions. These findings underscore the potential of our integrated approach to efficiently convert MW and BMW into valuable e-fuels while maintaining a focus on environmental sustainability.

Suggested Citation

  • Zhou, Jianzhao & Ayub, Yousaf & Shi, Tao & Ren, Jingzheng & He, Chang, 2024. "Sustainable co-valorization of medical waste and biomass waste: Innovative process design, optimization and assessment," Energy, Elsevier, vol. 288(C).
    • Handle: RePEc:eee:energy:v:288:y:2024:i:c:s0360544223031973
    DOI: 10.1016/j.energy.2023.129803
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