Impact of organic loading rate and reactor design on thermophilic anaerobic digestion of mixed supermarket waste

  • L. Megido /
  • L. Negral /
  • Y. Fernández-Nava /
  • B. Suárez-Peña /
  • P. Ormaechea /
  • P. Díaz-Caneja /
  • L. Castrillón /
  • E. Marañón
Journal ar
Waste Management
  • Volumen: 123
  • Fecha: 15 marzo 2021
  • Páginas: 52-59
  • ISSN: 18792456 0956053X
  • Tipo de fuente: Revista
  • DOI: 10.1016/j.wasman.2021.01.012
  • Tipo de documento: Artículo
  • Editorial: Elsevier Ltd
© 2021 Elsevier LtdA mixture of supermarket food waste from bakery, butchery, cooked meats and cheese, fishmonger, fruit, and vegetable sections was subjected to anaerobic digestion under thermophilic conditions (55 °C). Lab-scale induced bed reactors (IBR) and completely stirred tank reactors (CSTR) were operated at different organic loading rates (OLR), i.e., 3.0, 3.6 and 4.6 kg volatile solids (VS) per m3 of reactor and day. Regardless of the type of reactor, an OLR of 3.6 kg VS/m3·day was found to be the optimum, achieving up to 48.1% more methane production per kg of treated waste than for the other OLRs tested. In general, there were no statistically significant differences (p-value < 0.05) between IBR and CSTR performance at the same OLR tested. However, for the optimum OLR, the IBR achieved a mean methane production of 1.5 L CH4/Lreactor·day (426.7 L CH4/kg VS) and the highest VS removal (89.0%, on average). This reactor obtained 22.1% more CH4 yield than the analogous CSTR and the highest methane content in the biogas (66.9% CH4). Finally, the process was successfully tested under large-scale conditions (1.25 m3 IBR pilot-plant). The CH4 production and the biodegradation yield were in line with those obtained in the lab-scale IBR.

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