Abstract
Fe4O3 has shown great potential as an enhancer of batch anaerobic digestion performance. In this study, the effect of two types of Fe3O4 additive utilization strategies (magnetic separation recycling strategy and replenishment without recycling strategy) on semi-continuous anaerobic co-digestion of sludge and corn straw were investigated. A maximum methane yield of 163.88 ± 12.18 mL/g·VS·d was obtained at the dosage of 10 g/kg Fe3O4 with magnetic separation recycling strategy compared to the control without the addition of Fe3O4. As compared to the replenishment strategy, the recycling strategy improved specific daily methane yields by 38.45% and 45.75% for Fe3O4 addition amounts of 5 g/kg and 10 g/kg, respectively. The results show that the recycling of Fe3O4 additives can further optimize the composition of VFAs. Although the total VFAs were not elevated, the proportion of acetic acid increased and the proportion of propionic acid as well as butyric acid decreased. The present research supports the magnetic recycling of Fe3O4 as a new strategy to solve the problem of additive loss in semi-continuous anaerobic digestion process.
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Acknowledgements
This work was supported by National key research and development programs, China (Grant Nos. 2023YFE0106000 and 2020YFC1910000) and the Post-doctoral Scientific Research Funded Project of Henan Province, China (Grant No. HN2022114), and the National Natural Science Foundation of China (Grant No. 52176184).
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Jiao, Y., Qin, Y., He, X. et al. The Research on Different Strategies of Fe3O4 Additive Utilization during Semi-Continuous Anaerobic Co-Digestion: A Comparison of Magnetic Separation Recycling and Replenishment without Recycling. Waste Biomass Valor 15, 3477–3486 (2024). https://doi.org/10.1007/s12649-024-02440-4
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DOI: https://doi.org/10.1007/s12649-024-02440-4