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Effects of Iron-Loaded Biochar on the Anaerobic Co-Digestion of Food Waste and Sewage Sludge and Elucidating the Mechanism Thereof

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  • Wenxu Lu

    (School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China)

  • Guanyong Deng

    (School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China)

  • Xiaoge Cheng

    (School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China)

  • Wan Wang

    (School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China)

Abstract

The inhibition of volatile fatty acid (VFA) production is an important factor affecting biogas (methane) production in the anaerobic co-digestion systems comprising food waste and sewage sludge. In this study, batch experiments were conducted at medium temperature (36 ± 0.5 °C), during which the biogas production index and material–liquid characteristic parameters of the anaerobic digestion systems containing different concentrations of iron-loaded biochar (Fe-BC) were monitored. The cumulative biogas production data were analyzed using a modified Gompertz kinetic model to determine the effect of the Fe-BC on biogas production in the anaerobic co-digestion system. Studies have shown that addition of Fe-BC does not significantly influence the hydrolysis and acidification stages of anaerobic co-digestion, but does have a significant effect on promoting methanogenesis by alleviating the accumulation of VFAs and improving both the buffer capacity of the system and the efficiency of substrate-to-biogas conversion. When the Fe-BC concentration was 16 g·L −1 , the cumulative biogas production reached 329.42 mL·g-VS −1 , which was 49.7% higher than the blank group, and the lag period was 3.55 d, which was 42% shorter than the blank group. Mechanistic studies have shown that Fe-BC increased the concentration of coenzyme F 420 and the conductivity of the digestate in the co-digestion system, which increased the activity of methanogens in the anaerobic digestion system, thereby promoting methanogenesis.

Suggested Citation

  • Wenxu Lu & Guanyong Deng & Xiaoge Cheng & Wan Wang, 2022. "Effects of Iron-Loaded Biochar on the Anaerobic Co-Digestion of Food Waste and Sewage Sludge and Elucidating the Mechanism Thereof," Sustainability, MDPI, vol. 14(15), pages 1-11, August.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:15:p:9442-:d:877935
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    References listed on IDEAS

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    1. Shamurad, Burhan & Sallis, Paul & Petropoulos, Evangelos & Tabraiz, Shamas & Ospina, Carolina & Leary, Peter & Dolfing, Jan & Gray, Neil, 2020. "Stable biogas production from single-stage anaerobic digestion of food waste," Applied Energy, Elsevier, vol. 263(C).
    2. Zhen, Guangyin & Lu, Xueqin & Kobayashi, Takuro & Li, Yu-You & Xu, Kaiqin & Zhao, Youcai, 2015. "Mesophilic anaerobic co-digestion of waste activated sludge and Egeria densa: Performance assessment and kinetic analysis," Applied Energy, Elsevier, vol. 148(C), pages 78-86.
    3. Hassan, Gamal K. & Abdel-Karim, Ahmed & Al-Shemy, Mona T. & Rojas, Patricia & Sanz, Jose L. & Ismail, Sameh H. & Mohamed, Gehad G. & El-gohary, Fatma A. & Al-sayed, Aly, 2022. "Harnessing Cu@Fe3O4 core shell nanostructure for biogas production from sewage sludge: Experimental study and microbial community shift," Renewable Energy, Elsevier, vol. 188(C), pages 1059-1071.
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