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Enhancement of System and Environmental Performance of High Solids Anaerobic Digestion of Lignocellulosic Banana Waste by Biochar Addition

Author

Listed:
  • Xia Yang

    (Department of Civil & Environmental Engineering, University of South Florida, Tampa, FL 33620, USA)

  • Qiong Zhang

    (Department of Civil & Environmental Engineering, University of South Florida, Tampa, FL 33620, USA)

  • Sarina J. Ergas

    (Department of Civil & Environmental Engineering, University of South Florida, Tampa, FL 33620, USA)

Abstract

Banana waste, a lignocellulosic waste material, is generated in large quantities around the world. High Solids Anaerobic Digestion (HS-AD) of lignocellulosic waste can recover energy and reduce its environmental impacts. However, high carbon/nitrogen ratios and low water content in HS-AD can potentially cause system acidification and/or failure. This study investigated the addition of biochar to enhance the performance of HS-AD of mixed banana waste (peel, stem, and leaf). Biochemical methane potential assays with varying biochar dosages (2.5–30%) showed that 10% biochar addition increased methane yields by 7% compared with unamended controls. Semi-continuous HS-AD studies, without and with 10% biochar addition, were conducted at varying solids retention times (42, 35, and 28 days) for long-term performance evaluation. Biochar addition reduced volatile fatty acid accumulation, improved system stability, and increased methane production by 20–47%. The nutrient content of digestate from HS-AD of banana waste indicated its potential use as a bio-fertilizer. Life cycle assessment results showed that biochar addition to HS-AD resulted in greater environmental benefits in most categories compared with the unamended control, including eutrophication, ecotoxicity, and fossil fuel depletion when biochar was available within a radius of 8830 km.

Suggested Citation

  • Xia Yang & Qiong Zhang & Sarina J. Ergas, 2023. "Enhancement of System and Environmental Performance of High Solids Anaerobic Digestion of Lignocellulosic Banana Waste by Biochar Addition," Sustainability, MDPI, vol. 15(8), pages 1-20, April.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:8:p:6832-:d:1126629
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    References listed on IDEAS

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    3. Xinhua Shen & Raghava R. Kommalapati & Ziaul Huque, 2015. "The Comparative Life Cycle Assessment of Power Generation from Lignocellulosic Biomass," Sustainability, MDPI, vol. 7(10), pages 1-14, September.
    4. Gahyun Baek & Jaai Kim & Jinsu Kim & Changsoo Lee, 2018. "Role and Potential of Direct Interspecies Electron Transfer in Anaerobic Digestion," Energies, MDPI, vol. 11(1), pages 1-18, January.
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