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Free nitrous acid (FNA) pretreatment enhances biomethanation of lignocellulosic agro-waste (wheat straw)

Author

Listed:
  • Tamang, Phurba
  • Tyagi, Vinay Kumar
  • Gunjyal, Neelam
  • Rahmani, Ali Mohammad
  • Singh, Rajesh
  • Kumar, Pradeep
  • Ahmed, Banafsha
  • Tyagi, Pooja
  • Banu, Rajesh
  • Varjani, Sunita
  • Kazmi, A.A.

Abstract

Agro-residues having lignocellulosic biomass are considered the most effective source (heating value 16 MJ/kg) for energy production through anaerobic digestion (AD). However, complex lignocellulosic fraction in agro-residue obstructs its biotransformation and is a rate-limiting step of the AD process. This study presents a novel free nitrous acid (FNA) pretreatment to enhance the biomethanation of wheat straw (WS). The effect of FNA pretreatment was evaluated through anaerobic digestion test and model-based evaluation performed in two phases, i.e., mono-digestion (phase I) and co-digestion of wheat straw with cattle manure and food waste (phase II). For phase I, the first-order, transference, and dual pool first-order models showed the best model fit with R2 > 0.98, but the dual pool first-order model (DP-FOM) showed the least root mean square error (RMSE) of 1.88–62.10. The DP-FOM analysis of assays from anaerobic digestion test showed the biogas yields of 576, 564, and 565 mL/g VSadded at 1.77, 3.54, and 5.31 mg HNO2–N/L FNA concentrations and 12 h reaction time, respectively. The corresponding increment in biogas yields was 10.87, 8.85 and 8.80%. In phase II, DP-FOM analysis revealed the best model fit with R2 > 0.99 and the least RMSE of 8.88–13.04. The DP-FOM analysis from assays from anaerobic digestion test for 12 h FNA pretreatment showed the peak biogas yields of 715, 648, and 654mL/gVSadded at 1.77, 3.54 and 5.31 mg HNO2–N/L FNA concentrations, respectively. The corresponding improvement in biogas yields was 32.24, 19.81, and 20.90%. The FNA pretreatment can potentially improve the biogas yield from wheat straw effectively under mono- and co-digestion conditions. Even co-digestion could achieve enhanced biogas yield over mono-digestion.

Suggested Citation

  • Tamang, Phurba & Tyagi, Vinay Kumar & Gunjyal, Neelam & Rahmani, Ali Mohammad & Singh, Rajesh & Kumar, Pradeep & Ahmed, Banafsha & Tyagi, Pooja & Banu, Rajesh & Varjani, Sunita & Kazmi, A.A., 2023. "Free nitrous acid (FNA) pretreatment enhances biomethanation of lignocellulosic agro-waste (wheat straw)," Energy, Elsevier, vol. 264(C).
    • Handle: RePEc:eee:energy:v:264:y:2023:i:c:s0360544222031358
    DOI: 10.1016/j.energy.2022.126249
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    References listed on IDEAS

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    1. Chandra, R. & Takeuchi, H. & Hasegawa, T., 2012. "Methane production from lignocellulosic agricultural crop wastes: A review in context to second generation of biofuel production," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(3), pages 1462-1476.
    2. Bai, Xue & Lant, Paul A. & Jensen, Paul D. & Astals, Sergi & Pratt, Steven, 2016. "Enhanced methane production from algal digestion using free nitrous acid pre-treatment," Renewable Energy, Elsevier, vol. 88(C), pages 383-390.
    3. S. Bhuvaneshwari & Hiroshan Hettiarachchi & Jay N. Meegoda, 2019. "Crop Residue Burning in India: Policy Challenges and Potential Solutions," IJERPH, MDPI, vol. 16(5), pages 1-19, March.
    4. Lohan, Shiv Kumar & Jat, H.S. & Yadav, Arvind Kumar & Sidhu, H.S. & Jat, M.L. & Choudhary, Madhu & Peter, Jyotsna Kiran & Sharma, P.C., 2018. "Burning issues of paddy residue management in north-west states of India," Renewable and Sustainable Energy Reviews, Elsevier, vol. 81(P1), pages 693-706.
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