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<p>This study investigates optimization of net energy recovery from biodegradable solid waste (BSW) using a two-stage anaerobic digestion (TAD) system. BSW was pretreated by hydrolysis at 37&#xa0;°C (pH 4.5–6.5), with hydraulic retention time (HRT) of 5 days and total solid (TS) concentration of 120&#xa0;g/L. The liquid hydrolysate was collected, diluted, and fed continuously to a methane reactor (MR) operated at organic loading rate (OLR) of 1.9–11.4&#xa0;g-TS/L/d (corresponding HRT: 15.9–3.6 d). Maximum biogas yield and methane content (327 mL/g-TS and 71.6% CH₄) were observed at the lowest OLR (1.9&#xa0;g-TS/L/d) and pH 6.5; the minimum yield (193 mL/g-TS, 54.1% CH₄) occurred at pH 4.5 and the highest OLR. The relationship between operating conditions and net energy recovery was modeled using a quadratic multiple regression analysis, yielding a high correlation coefficient (R² = 0.8823). The model predicted the optimal energy recovery ∆E<sub>optimal</sub> was 6703&#xa0;J/g-TS (1862 Wh/kg-TS) at a pH of 6.5, OLR of 5.6&#xa0;g-TS/L/d, and HRT of 5.4 d. The optimized TAD configuration outperformed typical single-stage systems in net energy recovery and provides practical operating guidelines for waste-to-energy applications.&#xa0;</p> Graphical Abstract <p></p>

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Optimization of Net Energy Recovery from the Biodegradable Solid Waste in a Two-Stage Anaerobic Digestion System

  • 期刊论文

  • 发表日期：

    2026年1月15日

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  • Van Dinh Pham,
  • Van Toi Pham,
  • Van Manh Do,
  • Chang-Ping Yu,
  • Thu Hang Duong

摘要

This study investigates optimization of net energy recovery from biodegradable solid waste (BSW) using a two-stage anaerobic digestion (TAD) system. BSW was pretreated by hydrolysis at 37 °C (pH 4.5–6.5), with hydraulic retention time (HRT) of 5 days and total solid (TS) concentration of 120 g/L. The liquid hydrolysate was collected, diluted, and fed continuously to a methane reactor (MR) operated at organic loading rate (OLR) of 1.9–11.4 g-TS/L/d (corresponding HRT: 15.9–3.6 d). Maximum biogas yield and methane content (327 mL/g-TS and 71.6% CH₄) were observed at the lowest OLR (1.9 g-TS/L/d) and pH 6.5; the minimum yield (193 mL/g-TS, 54.1% CH₄) occurred at pH 4.5 and the highest OLR. The relationship between operating conditions and net energy recovery was modeled using a quadratic multiple regression analysis, yielding a high correlation coefficient (R² = 0.8823). The model predicted the optimal energy recovery ∆Eoptimal was 6703 J/g-TS (1862 Wh/kg-TS) at a pH of 6.5, OLR of 5.6 g-TS/L/d, and HRT of 5.4 d. The optimized TAD configuration outperformed typical single-stage systems in net energy recovery and provides practical operating guidelines for waste-to-energy applications. 

Graphical Abstract