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Used disposable nappies and expired food products co-digestion: A pilot-scale system assessment

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  • Tsigkou, Konstantina
  • Tsafrakidou, Panagiota
  • Zagklis, Dimitris
  • Panagiotouros, Anastasios
  • Sionakidis, Dimitris
  • Zontos, Dimitris Marios
  • Zafiri, Constantina
  • Kornaros, Michael

Abstract

The present work demonstrates the co-digestion of Used Disposable Nappies (DN) hydrolysate and Expired Food Products (EFP) at 60/40 (v/v) ratio in a two-stage pilot-scale mesophilic (37 °C) anaerobic system, in comparison with previously published data obtained from lab-scale experiments. The aim of the study was to validate the scale-up simulation of the lab experimentation and to evaluate the efficiency of the pilot-scale system. The operational conditions (acidogenic reactor: constant pH 5.5, HRT 2 d, and methanogenic reactor: HRT 20 d) were selected with respect to lab-scale results. The pilot-system succeeded a 75% COD removal, 0.63 ± 0.06 LCH4/LReactor.d and 0.37 ± 0.09 LH2/LReactor.d. The daily obtained gaseous biofuels’ yields correspond to 45.7 MJ of energy, which is 2.85 times higher than the energy needed for the operation of the equipment. It is estimated that the pilot-stage system converted 73% of the chemical energy of the feed materials to gaseous biofuels. Negligible differences between the two scales of the system were recorded, and the results are promising for the development of a full-scale process that would valorize these specific waste streams.

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  • 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.
    • Handle: RePEc:eee:renene:v:165:y:2021:i:p1:p:109-117
    DOI: 10.1016/j.renene.2020.11.013
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    1. 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.
    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.
    3. Constantin Stan & Gerardo Collaguazo & Constantin Streche & Tiberiu Apostol & Diana Mariana Cocarta, 2018. "Pilot-Scale Anaerobic Co-Digestion of the OFMSW: Improving Biogas Production and Startup," Sustainability, MDPI, vol. 10(6), pages 1-15, June.
    4. He Song & Yue Zhang & Sigrid Kusch-Brandt & Charles J. Banks, 2020. "Comparison of Variable and Constant Loading for Mesophilic Food Waste Digestion in a Long-Term Experiment," Energies, MDPI, vol. 13(5), pages 1-14, March.
    5. Ormaechea, P. & Castrillón, L. & Suárez-Peña, B. & Megido, L. & Fernández-Nava, Y. & Negral, L. & Marañón, E. & Rodríguez-Iglesias, J., 2018. "Enhancement of biogas production from cattle manure pretreated and/or co-digested at pilot-plant scale. Characterization by SEM," Renewable Energy, Elsevier, vol. 126(C), pages 897-904.
    6. Bi, Shaojie & Hong, Xiujie & Yang, Hongzhi & Yu, Xinhui & Fang, Shumei & Bai, Yan & Liu, Jinli & Gao, Yamei & Yan, Lei & Wang, Weidong & Wang, Yanjie, 2020. "Effect of hydraulic retention time on anaerobic co-digestion of cattle manure and food waste," Renewable Energy, Elsevier, vol. 150(C), pages 213-220.
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    Cited by:

    1. 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.
    2. 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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