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

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

Energy, 2023, vol. 264, issue C

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.

Keywords: Anaerobic digestion; Lignocellulosic; Free nitrous acid; Wheat straw; Pretreatment; Biogas (search for similar items in EconPapers)
Date: 2023
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:264:y:2023:i:c:s0360544222031358

DOI: 10.1016/j.energy.2022.126249

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