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Acidogenic digestion of food waste in a thermophilic leach bed reactor: effect of pH and leachate recirculation rate on hydrolysis and volatile fatty acid production

Par Conseil national de recherches du Canada

DOITrouver le DOI : https://doi.org/10.1016/j.biortech.2017.08.130
AuteurRechercher : 1; Rechercher : 1; Rechercher : 1
Affiliation
  1. Conseil national de recherches Canada. Énergie, les mines et l'environnement
FormatTexte, Article
Sujetacidogenic digestion; food waste; leach bed reactor; pH control; leachate recirculation rate
Résumé
The effect of pH control (4, 5, 6, 7) on volatile fatty acids (VFA) production from food waste was investigated in a leach bed reactor (LBR) operated at 50°C. Stabilisation of pH at 7 resulted in hydrolysis yield of 530 g soluble chemical oxygen demand (sCOD)/kg total volatile solids (TVS) added and VFA yield of 247 g COD/kg TVS added, which were highest among all pH tested. Butyric acid dominated the VFA mix (49-54%) at pH of 7 and 6, while acetate composed the primary VFA (41-56%) at pH of 4 and 5. A metabolic shift towards lactic acid production was observed at pH of 5. Improving leachate recirculation rate further improved the hydrolysis and degradation efficiency by 10-16% and the acidification yield to 340 g COD/kg TVS added. The butyric acid concentration of 16.8 g/L obtained at neutral pH conditions is among the highest reported in literature.
Date de publication
Maison d’éditionElsevier
Dans
  • Bioresource Technology.
Langueanglais
Publications évaluées par des pairsOui
Numéro NPARC23002235
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Identificateur de l’enregistrement1556353c-73b6-4c51-a3bc-17bded0c4cb9
Enregistrement créé2017-09-12
Enregistrement modifié2020-03-16
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