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Mechanisms of hydrogen-producing community reconstruction under organic loading control: the synergistic effects of initial organic loading rate and hydraulic retention time

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  • Wang, Dengyang
  • Cui, Peiqi
  • Tian, Yu
  • Wang, Yaoqiang
  • Su, Haijia

Abstract

Valorizing high-value kitchen waste requires precise control of initial organic loading rate (OLR) and hydraulic retention time (HRT) for stable semi-continuous biohydrogen production. This study reveals dynamic OLR-HRT thresholds governing competition between hydrogen-producing bacteria (HPB) and lactic acid bacteria (LAB). Results indicate that with an initial OLR of 11% total solids (TS) and an HRT of 30 h, HPB dominated the microbial community, achieving the highest hydrogen production rate (HPR) of 11.2 L/L/d and a hydrogen yield (HY) of 139 mL/g VSadd in the semi-continuous system. Conversely, increasing OLR (6% - 16% TS) or reducing HRT (36 - 24 h) impaired microbial antioxidant capacity, motility, and metabolite excretion. This suppressed HPB abundance, reducing HY by 53% while promoting LAB proliferation (>50.6%) and lactate accumulation (33.1 g/L). These findings demonstrate coordinated OLR-HRT control regulates HPB-LAB balance, enhancing operational controllability for sustainable biohydrogen recovery from kitchen waste.

Suggested Citation

  • Wang, Dengyang & Cui, Peiqi & Tian, Yu & Wang, Yaoqiang & Su, Haijia, 2026. "Mechanisms of hydrogen-producing community reconstruction under organic loading control: the synergistic effects of initial organic loading rate and hydraulic retention time," Renewable Energy, Elsevier, vol. 266(C).
    • Handle: RePEc:eee:renene:v:266:y:2026:i:c:s0960148126005069
    DOI: 10.1016/j.renene.2026.125681
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