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Used disposable nappies and expired food products valorisation through one- & two-stage anaerobic co-digestion

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  • Tsigkou, Konstantina
  • Tsafrakidou, Panagiota
  • Kopsahelis, Alexandros
  • Zagklis, Dimitris
  • Zafiri, Constantina
  • Kornaros, Michael

Abstract

In the present work, an innovative approach of used disposable nappies (DN) treatment is presented aiming at energy recovery through anaerobic co-digestion of their biodegradable content along with a waste fraction containing expired food products (EFP). More specifically, a mixture of hydrolysate, prepared from used disposable nappies with pulverized fruits/vegetables that have lost their retail value, was used as feedstock in two- and one-stage mesophilic anaerobic digestion systems at a 60:40 (v/v) ratio. For the two-stage experiments, different combinations of pH and Hydraulic Retention Time (HRT) were tested in the acidogenic and methanogenic reactor. The performance of the system, operated at steady-state conditions, in terms of COD removal, digestion stability, and biofuels (H2 and CH4) production, was compared with that obtained from the one-stage configuration. The comparison between the two systems revealed that COD removal reached 80% in the two-stage system, but only 68% in the one-stage. At HRT 25d the yield of produced methane in the methanogenic reactor of the two-stage system reached the theoretical value of 0.35 LCH4/gt-COD removed. Comparing the two-stage system, operated at HRT 15d, with the one-stage system, it was evident that the energy production of the two-stage system was higher by 18.4%.

Suggested Citation

  • Tsigkou, Konstantina & Tsafrakidou, Panagiota & Kopsahelis, Alexandros & Zagklis, Dimitris & Zafiri, Constantina & Kornaros, Michael, 2020. "Used disposable nappies and expired food products valorisation through one- & two-stage anaerobic co-digestion," Renewable Energy, Elsevier, vol. 147(P1), pages 610-619.
    • Handle: RePEc:eee:renene:v:147:y:2020:i:p1:p:610-619
    DOI: 10.1016/j.renene.2019.09.028
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    1. Ghimire, Anish & Frunzo, Luigi & Pirozzi, Francesco & Trably, Eric & Escudie, Renaud & Lens, Piet N.L. & Esposito, Giovanni, 2015. "A review on dark fermentative biohydrogen production from organic biomass: Process parameters and use of by-products," Applied Energy, Elsevier, vol. 144(C), pages 73-95.
    2. Schievano, A. & Tenca, A. & Lonati, S. & Manzini, E. & Adani, F., 2014. "Can two-stage instead of one-stage anaerobic digestion really increase energy recovery from biomass?," Applied Energy, Elsevier, vol. 124(C), pages 335-342.
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    1. Tsigkou, Konstantina & Zagklis, Dimitris & Tsafrakidou, Panagiota & Zapanti, Paraskevi & Manthos, Georgios & Karamitou, Konstantina & Zafiri, Constantina & Kornaros, Michael, 2021. "Expired food products and used disposable adult nappies mesophilic anaerobic co-digestion: Biochemical methane potential, feedstock pretreatment and two-stage system performance," Renewable Energy, Elsevier, vol. 168(C), pages 309-318.
    2. Vincenzo Torretta & Athanasia K. Tolkou & Ioannis A. Katsoyiannis & Francesca Maria Caccamo & Marco Carnevale Miino & Marco Baldi & Maria Cristina Collivignarelli, 2021. "Enhancement of Methanogenic Activity in Volumetrically Undersized Reactor by Mesophilic Co-Digestion of Sewage Sludge and Aqueous Residue," Sustainability, MDPI, vol. 13(14), pages 1-11, July.
    3. Tsigkou, Konstantina & Tsafrakidou, Panagiota & Zagklis, Dimitris & Panagiotouros, Anastasios & Sionakidis, Dimitris & Zontos, Dimitris Marios & Zafiri, Constantina & Kornaros, Michael, 2021. "Used disposable nappies and expired food products co-digestion: A pilot-scale system assessment," Renewable Energy, Elsevier, vol. 165(P1), pages 109-117.
    4. Srisowmeya, G. & Chakravarthy, M. & Nandhini Devi, G., 2020. "Critical considerations in two-stage anaerobic digestion of food waste – A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 119(C).
    5. Margarita Andreas Dareioti & Aikaterini Ioannis Vavouraki & Konstantina Tsigkou & Michael Kornaros, 2021. "Assessment of Single- vs. Two-Stage Process for the Anaerobic Digestion of Liquid Cow Manure and Cheese Whey," Energies, MDPI, vol. 14(17), pages 1-14, August.
    6. Georgios Manthos & Dimitris Zagklis & Constantina Zafiri & Michael Kornaros, 2024. "Techno-Economic Assessment of Anaerobic Digestion for Olive Oil Industry Effluents in Greece," Sustainability, MDPI, vol. 16(5), pages 1-13, February.
    7. Patel, Sanjay K.S. & Das, Devashish & Kim, Sun Chang & Cho, Byung-Kwan & Kalia, Vipin Chandra & Lee, Jung-Kul, 2021. "Integrating strategies for sustainable conversion of waste biomass into dark-fermentative hydrogen and value-added products," Renewable and Sustainable Energy Reviews, Elsevier, vol. 150(C).
    8. Manthos, Georgios & Dareioti, Margarita & Zagklis, Dimitris & Kornaros, Michael, 2023. "Using biochemical methane potential results for the economic optimization of continuous anaerobic digestion systems: the effect of substrates’ synergy," Renewable Energy, Elsevier, vol. 211(C), pages 296-306.
    9. Tsigkou, Konstantina & Sventzouri, Eirini & Zafiri, Constantina & Kornaros, Michael, 2023. "Digestate recirculation rate optimization for the enhancement of hydrogen production: The case of disposable nappies and fruit/vegetable waste valorization in a mesophilic two-stage anaerobic digestio," Renewable Energy, Elsevier, vol. 215(C).

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