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<p>Reactor instability in anaerobic digestion (AD) critically impedes the efficient utilization of biomass potential energy, affecting biogas yield and economic viability while contributing to environmental pollution and resource wastage. Optimizing the operational conditions of AD systems is critical for evaluating the thresholds and thus maximizing reactor efficacy. A novel pilot-scale anaerobic baffled reactor (ABBR, 10 m<sup>3</sup>) was assessed for 165 days at three hydraulic retention times (HRT): HRT1 (25 days), HRT2(20 days), and HRT3 (15 days), to optimize the substrate retention time of the reactor for maximum methane yield. <i>Hydrilla verticillata</i> (HV), a lignocellulosic aquatic weed biomass, was used as the substrate, and cow dung was used as the inoculum. HRT2 at an organic loading rate (OLR) of 20.24&#xa0;kg-VS/day showed the highest cumulative biogas production of 85.802 m<sup>3</sup> and a methane yield of 121.04 mL/g-VS. HRT3 (15 days) at an OLR of 25.35&#xa0;kg-VS/day showed the highest daily biogas production of 3.84 m<sup>3</sup>/day but with fluctuating daily biogas generation and lower methane yield. The effluent characteristics regarding substrate removal and volatile fatty acids (VFA) accumulation were slightly better for HRT1, followed by HRT2 and HRT3, suggesting possible reactor instability when exposed to higher organic loads for long periods. However, the kinetic analysis using the first-order kinetic, Grau second-order, and modified Stover-Kincannon models indicated better predictability and reactor performance at lower HRTs. This may be attributed to the limitation of kinetic models in accounting for alterations in AD pathways. These findings highlight the importance of HRT management in maximizing the biogas yield and effluent quality.</p>

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Optimizing biogas yield and process performance in a novel anaerobic bi-phased baffled reactor (ABBR) for aquatic weed biomass valorization

  • 期刊论文

  • 发表日期：

    2025年5月23日

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  • Arun Sathyan,
  • Dhamodharan Kondusamy,
  • Meena Khwairakpam,
  • Ajay S. Kalamdhad

摘要

Reactor instability in anaerobic digestion (AD) critically impedes the efficient utilization of biomass potential energy, affecting biogas yield and economic viability while contributing to environmental pollution and resource wastage. Optimizing the operational conditions of AD systems is critical for evaluating the thresholds and thus maximizing reactor efficacy. A novel pilot-scale anaerobic baffled reactor (ABBR, 10 m3) was assessed for 165 days at three hydraulic retention times (HRT): HRT1 (25 days), HRT2(20 days), and HRT3 (15 days), to optimize the substrate retention time of the reactor for maximum methane yield. Hydrilla verticillata (HV), a lignocellulosic aquatic weed biomass, was used as the substrate, and cow dung was used as the inoculum. HRT2 at an organic loading rate (OLR) of 20.24 kg-VS/day showed the highest cumulative biogas production of 85.802 m3 and a methane yield of 121.04 mL/g-VS. HRT3 (15 days) at an OLR of 25.35 kg-VS/day showed the highest daily biogas production of 3.84 m3/day but with fluctuating daily biogas generation and lower methane yield. The effluent characteristics regarding substrate removal and volatile fatty acids (VFA) accumulation were slightly better for HRT1, followed by HRT2 and HRT3, suggesting possible reactor instability when exposed to higher organic loads for long periods. However, the kinetic analysis using the first-order kinetic, Grau second-order, and modified Stover-Kincannon models indicated better predictability and reactor performance at lower HRTs. This may be attributed to the limitation of kinetic models in accounting for alterations in AD pathways. These findings highlight the importance of HRT management in maximizing the biogas yield and effluent quality.