Journal
BIORESOURCE TECHNOLOGY
Volume 337, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.125380
Keywords
Co-fermentation; Biohydrogen; Antibiotic fermentation residue; Fallen leaves; Microbial community
Funding
- National Natural Science Foundation of China [51338005]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT-13026]
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The study investigated the co-fermentation of antibiotic fermentation residue (AFR) and fallen leaves to enhance biohydrogen production. Results showed that the optimal mixing ratio of AFR to leaves was 25:75, which significantly increased hydrogen yield. Co-fermentation promoted microbial activity, enriched hydrogen-producing bacteria, and enhanced the expression of hydrogen-producing functional genes, fundamentally responsible for synergistic biohydrogen fermentation.
This investigation explored the co-fermentation of antibiotic fermentation residue (AFR) and fallen leaves for enhancing biohydrogen production, and analyzed the mechanism from the aspects of microbial activity, microbial community and functional genes. The results showed that the optimal mixing ratio of AFR to leaves was 25:75 (VS basis), which balanced the substrate condition and synergistically enhanced the biohydrogen productivity, and the hydrogen yield was 37.45 mL/g-VSadded, which was 438.8% and 9.2% higher compared to the sole AFR fermentation and the sole leaves fermentation, respectively. The co-fermentation also improved the organics utilization and induced a more effective metabolic pathway. Further microbiology analysis found that the co-fermentation promoted the microbial activity, enriched more hydrogen-producing bacteria (Clostridium sensu stricto 1), and enhanced the expression of hydrogen-producing functional genes (e.g. genes encoding ferredoxin hydrogenase (EC 1.12.7.2) and pyruvate-ferredoxin oxidoreductase (EC 1.2.7.1)), which were fundamentally responsible for the synergistic biohydrogen fermentation.
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