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Semi-continuous co-digestion of sludge, fallen leaves, and grass performance

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  • Elsayed, Mahmoud
  • Blel, Walid
  • Soliman, Mohamed
  • Andres, Yves
  • Hassan, Raouf

Abstract

The aim of this study is to improve the management of different types of wastes using an anaerobic digestion process and CH4 production from the semi-continuous co-digestion of multi-substrates of fallen leaves (FL), grass (GR) and primary sludge (PS). As a first step, the co-digestion of FL, GR and PS was carried out using the BMP test based on C/N ratios. The results showed that the best CH4 production was at a C/N ratio of 13. Kinetic analysis of the methane produced showed no adaptation phase was needed for the methanogenic bacteria to stimulate their anaerobic digestion activity. The inflection point in the cumulative methane production curve is identified as the biological hydrolysis phase of the substrates by endogenous microorganisms. In the second step, semi-continuous co-digestion of FL, GR and PS was carried out. The performance of the reactor was monitored in particular for biodegradability of the feedstock and biogas production rate under different OLRs. The highest biogas production rate of 35 L/d was recorded at an OLR of 1 g VS/L·d. However, partial overloading occurred at an OLR of 1.5 g VS/L·d. The highest CH4 content of biogas produced was achieved at an OLR of 1.0 g VS/L·d.

Suggested Citation

  • Elsayed, Mahmoud & Blel, Walid & Soliman, Mohamed & Andres, Yves & Hassan, Raouf, 2021. "Semi-continuous co-digestion of sludge, fallen leaves, and grass performance," Energy, Elsevier, vol. 221(C).
    • Handle: RePEc:eee:energy:v:221:y:2021:i:c:s0360544221001377
    DOI: 10.1016/j.energy.2021.119888
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    References listed on IDEAS

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    1. Xiao, Benyi & Zhang, Wenzhe & Yi, Hao & Qin, Yu & Wu, Jing & Liu, Junxin & Li, Yu-You, 2019. "Biogas production by two-stage thermophilic anaerobic co-digestion of food waste and paper waste: Effect of paper waste ratio," Renewable Energy, Elsevier, vol. 132(C), pages 1301-1309.
    2. Cremiato, Raffaele & Mastellone, Maria Laura & Tagliaferri, Carla & Zaccariello, Lucio & Lettieri, Paola, 2018. "Environmental impact of municipal solid waste management using Life Cycle Assessment: The effect of anaerobic digestion, materials recovery and secondary fuels production," Renewable Energy, Elsevier, vol. 124(C), pages 180-188.
    3. Meike Nitsche & Frank Hensgen & Michael Wachendorf, 2017. "Using Grass Cuttings from Sports Fields for Anaerobic Digestion and Combustion," Energies, MDPI, vol. 10(3), pages 1-11, March.
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