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Comparison Among Thermal Pre-Treatments’ Effectiveness in Increasing Anaerobic Digestibility of Organic Fraction in Municipal Solid Wastes

Author

Listed:
  • Marco De Sanctis

    (Water Research Institute, National Research Council-C.N.R, Viale F. De Blasio 5, 70132 Bari, Italy)

  • Valerio Guido Altieri

    (Water Research Institute, National Research Council-C.N.R, Viale F. De Blasio 5, 70132 Bari, Italy)

  • Emanuele Barca

    (Water Research Institute, National Research Council-C.N.R, Viale F. De Blasio 5, 70132 Bari, Italy)

  • Luigi di Bitonto

    (Water Research Institute, National Research Council-C.N.R, Viale F. De Blasio 5, 70132 Bari, Italy)

  • Francesco Tedeschi

    (ICMEA S.r.l., Via Gravina 156, 70033 Corato, Italy)

  • Claudio Di Iaconi

    (Water Research Institute, National Research Council-C.N.R, Viale F. De Blasio 5, 70132 Bari, Italy)

Abstract

The organic fraction of municipal solid waste (OFMSW) is widely recognized as a possible substrate for anaerobic digestion processes. However, the heterogeneity of this matrix and the presence of slowly biodegradable compounds can slow down anaerobic digestion and reduce its performance. This study compares the effectiveness of different thermal pre-treatments in increasing OFMSW anaerobic digestibility. Thermal pre-treatments were compared with OFMSW shredding, considered as the minimum pre-treatment required in order to reduce particles size of the OFMSW. The pre-treatments were performed in autoclave (121 °C and 1.4 bar for 20 min) or in an ad hoc hydrolysis reactor designed for the experimental trial (140 °C and 7 bar for 30 min) with air or nitrogen as gas phase. The thermal pre-treatments affected methane yield (NmLCH 4 /gVS), depending on the pre-treatment strategy, with autoclaving allowing for an 80% increase with respect to the control run, and leading to a methane yield of 476 ± 194 NmL CH4 /gVS. The pre-treatments in the hydrolysis reactor caused a loss of organic matter (due to its volatilization) reducing the organic loading rate of the digester. Nevertheless, the digester performance in terms of COD (chemical oxygen demand) and VSS (volatile suspended solid) removal showed limited differences among the pre-treatments applied and ranged on average 79–94%.

Suggested Citation

  • Marco De Sanctis & Valerio Guido Altieri & Emanuele Barca & Luigi di Bitonto & Francesco Tedeschi & Claudio Di Iaconi, 2024. "Comparison Among Thermal Pre-Treatments’ Effectiveness in Increasing Anaerobic Digestibility of Organic Fraction in Municipal Solid Wastes," Energies, MDPI, vol. 17(24), pages 1-13, December.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:24:p:6293-:d:1543096
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    References listed on IDEAS

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