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Pilot-Scale Anaerobic Co-Digestion of Food Waste and Polylactic Acid

Author

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  • Angeliki Maragkaki

    (Department of Agriculture, School of Agricultural Science, Hellenic Mediterranean University, 71401 Crete, Greece)

  • Christos Tsompanidis

    (ENVIROPLAN S.A., 23 Perikleous & Iras Str., Gerakas, 15344 Athens, Greece)

  • Kelly Velonia

    (Department of Materials Science and Technology, University of Crete, 71003 Heraklion, Greece)

  • Thrassyvoulos Manios

    (Department of Agriculture, School of Agricultural Science, Hellenic Mediterranean University, 71401 Crete, Greece)

Abstract

Bioplastics are frequently utilized in daily life, particularly for food packaging and carrier bags. They can be delivered to biogas plants through a separate collection of the organic fraction of municipal waste (OFMSW). The increased demand for and use of bioplastics aimed at mitigating plastic pollution raises significant questions concerning their life cycle and compatibility with waste management units. Anaerobic digestion (AD) in OFMSW is a valuable resource for biogas production. In this work, the valorization of poly-L-lactic acid (PLLA) composed of food waste within the Biowaste to Bioplastic (B2B) Project framework was studied in laboratory and pilot-scale anaerobic liquid conditions. Taking into account that the addition of PLLA to biowaste can increase biogas production, we performed laboratory-scale anaerobic tests on food waste enriched with different molecular-weight PLLAs produced from food waste or commercial PLLA at a mesophilic temperature of 37 °C. PLLA with the highest molecular weight was subjected to AD on the pilot scale to further validate our findings. The addition of PLLA increased biogas production and had no apparent negative impact on the operation of the reactors used in the laboratory or on the pilot scale. Biogas production was higher when using PLLA with the lowest molecular weight. In the pilot-scale experiments, co-digestion of FW with PLLA increased biogas production by 1.1 times. When PLLA was added to the feed, biomethane was 8% higher, while volatile solids (VS) and total chemical oxygen demand (TCOD) removal were almost the same. Importantly, no effect was observed in the operation of the digesters.

Suggested Citation

  • Angeliki Maragkaki & Christos Tsompanidis & Kelly Velonia & Thrassyvoulos Manios, 2023. "Pilot-Scale Anaerobic Co-Digestion of Food Waste and Polylactic Acid," Sustainability, MDPI, vol. 15(14), pages 1-11, July.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:14:p:10944-:d:1192604
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    References listed on IDEAS

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    1. Ankita Shrestha & Mieke C. A. A. van-Eerten Jansen & Bishnu Acharya, 2020. "Biodegradation of Bioplastic Using Anaerobic Digestion at Retention Time as per Industrial Biogas Plant and International Norms," Sustainability, MDPI, vol. 12(10), pages 1-9, May.
    2. Abdullah Nsair & Senem Onen Cinar & Ayah Alassali & Hani Abu Qdais & Kerstin Kuchta, 2020. "Operational Parameters of Biogas Plants: A Review and Evaluation Study," Energies, MDPI, vol. 13(15), pages 1-27, July.
    3. Benjamin Nachod & Emily Keller & Amro Hassanein & Stephanie Lansing, 2021. "Assessment of Petroleum-Based Plastic and Bioplastics Degradation Using Anaerobic Digestion," Sustainability, MDPI, vol. 13(23), pages 1-14, December.
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