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Anaerobic co-digestion of tobacco processing residue: Multi-step approach for process optimization, key syntrophic microbiome identification, and techno-economic analysis

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  • Rhee, Chaeyoung
  • Cho, Subin
  • Kang, Ilwoo
  • Bae, Ilho
  • Cho, Kyungjin
  • Shin, Seung Gu

Abstract

This study evaluated the improved applicability of tobacco dust mixture (TDX), a residue generated during tobacco processing, as a substrate for anaerobic digestion (AD). The biochemical methane potential (BMP) test demonstrated that TDX alone produced 201.3 mL CH4/g volatile solids (VS), while food waste (FW) and sludge (SL) exhibited CH4 yields of 568.9 and 91.4 mL CH4/g VS, respectively. Additionally, the inhibition effect on biogas production due to nicotine content was found to be negligible below the threshold of 1 g nicotine/L. Co-digestion of TDX with FW and SL resulted in a synergistic effect, mainly when FW constituted at least 25 % of the total VS. The microbial analysis revealed microbes, such as Syntrophomonas and Sedimentibacter, that played key roles in AD of TDX. A techno-economic analysis assessed the feasibility of different AD process configurations under three primary objectives: waste removal, energy production, and digester volume optimization. Results indicated that prioritizing energy production reduced operational costs by up to 28 %, whereas strategies emphasizing waste removal and minimized digester footprint led to 15 % and 20 % reductions, respectively. In conclusion, TDX's co-digestion with FW enhances CH4 production efficiency and offers a practical and economically viable strategy for sustainable waste management.

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  • Rhee, Chaeyoung & Cho, Subin & Kang, Ilwoo & Bae, Ilho & Cho, Kyungjin & Shin, Seung Gu, 2025. "Anaerobic co-digestion of tobacco processing residue: Multi-step approach for process optimization, key syntrophic microbiome identification, and techno-economic analysis," Energy, Elsevier, vol. 319(C).
    • Handle: RePEc:eee:energy:v:319:y:2025:i:c:s0360544225007613
    DOI: 10.1016/j.energy.2025.135119
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