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The Fe3O4 nanoparticles-modified mycelium pellet-based anaerobic granular sludge enhanced anaerobic digestion of food waste with high salinity and organic load

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  • Cui, Peiqi
  • Ge, Jiye
  • Chen, Yingyun
  • Zhao, Yilin
  • Wang, Shaojie
  • Su, Haijia

Abstract

The accumulation of volatile fatty acids and high osmotic pressure of food waste usually result in poor operation performance and even failure of anaerobic digestion (AD). A novel Fe3O4 nanoparticles-modified Aspergillus tubingensis (AT) mycelium pellets-based anaerobic granular sludge (NPs@AT-AGS) was therefore developed to enhance energy recovery efficiency of food waste AD treatment. The AT mycelium particles, with three-dimensional spatial structure formed by large amounts of hyphae, served as support to attach activated sludge microbes. The Fe3O4 nanoparticles (NPs) stimulated extracellular polymeric substances (EPS) secretion of AT mycelium pellets to 117.55 mg/gVSS, and further increased the microbe absorption quantity to 1.23 g/gAT. The abundant EPS of the NPs@AT-AGS could protect microbes from high osmotic pressure, which resulted in a methane yield of 583.8 mL/gVS under a high salinity of 20 g/L NaCl, 1.6 times higher than that of the activated flocculent sludge (AFS). Moreover, the methane yield of actual food with high organic load also had a 24% improvement with the NPs@AT-AGS. Therefore, the NPs@AT-AGS is promising in the effective AD treatment of food waste with high salinity and organic load.

Suggested Citation

  • Cui, Peiqi & Ge, Jiye & Chen, Yingyun & Zhao, Yilin & Wang, Shaojie & Su, Haijia, 2022. "The Fe3O4 nanoparticles-modified mycelium pellet-based anaerobic granular sludge enhanced anaerobic digestion of food waste with high salinity and organic load," Renewable Energy, Elsevier, vol. 185(C), pages 376-385.
    • Handle: RePEc:eee:renene:v:185:y:2022:i:c:p:376-385
    DOI: 10.1016/j.renene.2021.12.050
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    References listed on IDEAS

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    1. Ohimain, Elijah Ige & Izah, Sylvester Chibueze, 2017. "A review of biogas production from palm oil mill effluents using different configurations of bioreactors," Renewable and Sustainable Energy Reviews, Elsevier, vol. 70(C), pages 242-253.
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    1. Raquel Barrena & Javier Moral-Vico & Xavier Font & Antoni Sánchez, 2022. "Enhancement of Anaerobic Digestion with Nanomaterials: A Mini Review," Energies, MDPI, vol. 15(14), pages 1-11, July.

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