Stabilization of microbial network by co-digestion of swine manure and organic wastes

• Published in: Journal of environmental management 2024-03, Vol.355, p.120475-120475, Article 120475
• Main Authors: Zhao, Xin, Hong, Jin-Kyung, Park, So Yun, Yun, Jinhyeon, Jho, Eun Hea
• Format: Article
• Language: English
• Subjects: Anaerobiosis; Animals; Bacteria; Biofuels - analysis; Bioreactors; Co-digestion; Co-occurrence network; Digestion; Female; Food; Food Loss and Waste; Food waste; Manure - microbiology; Methane; Methanogen; Refuse Disposal; Swine; Swine manure; Tomato waste
• ISSN: 0301-4797; 1095-8630
• DOI: 10.1016/j.jenvman.2024.120475

The production of biogas from organic waste has attracted considerable interest as a solution to current energy and waste management challenges. This study explored the methane (CH4) production potential of swine manure (SM), food waste (FW), and tomato waste (TW) and the changes in the microbial community involved in the anaerobic digestion process. The results revealed that the CH4 production potentials of the four kinds of SM samples were influenced by the characteristics of SM (e.g., age and storage period). Among the four kinds of SM samples, the CH4 yield from the manure directly sampled from primiparous sows (SM3) was the highest. The CH4 yield was significantly improved when SM3 was co-digested with FW, but not with TW. The addition of SM fostered a stable CH4 production community by enhancing the interaction between methanogens and syntrophic bacteria. Furthermore, the addition of FW as a co-substrate may improve the functional redundancy structure of the methanogenesis-associated network. Overall, the characteristics of SM must be considered to achieve consistent CH4 yield efficiency from anaerobic digestion since CH4 production potentials of SM can be different. Also, the contribution of co-substrate to the synergistic relationship between methanogens and syntrophic bacteria can be considered when a co-substrate is selected in order to enhace CH4 yield from SM. [Display omitted] •Fresher sow manure yielded more CH4 than aged or growing pig manures.•Food waste not tomato waste yielded more CH4 when digested with manure.•Swine manure (SM) was a beneficial substrate for methanogenic community.•SM led to a robust and stable co-occurrence network of methanogens.•Food waste diversified methanogens enhancing functional redundancy.