首页|Coffee grounds and fruit and vegetable waste co-digestion in dark Fermentation: Evaluation of mixing ratio and hybrid pretreatments impact on bio-hydrogen production

Coffee grounds and fruit and vegetable waste co-digestion in dark Fermentation: Evaluation of mixing ratio and hybrid pretreatments impact on bio-hydrogen production

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  • NETL
  • NSTL
  • Elsevier
Biohydrogen production using organic waste is gaining increasing interest due to its sustainable, efficient, and energy-efficient nature. Dark fermentation is one of the promising processes to produce this energy. This study explores the feasibility of dark fermentation co-digestion, specifically examining the combination of coffee grounds (CG) with fruit and vegetable wastes (FVW). Various ratios of FVW and CG co-digestion were examined under thermophilic and mesophilic conditions in the biochemical hydrogen potential test batch (BHP tests) to assess dark fermentation (DF) performance. An 80 % FVW and 20 % CG mixing ratio yielded optimal production at 517 mL bioH_2/g total volatile solids (TVS) at 55 ℃, marking a 15.67 % increase compared to mono-digestion of FVW (447 mL bioH_2/gTVS) and a 137.15 % increase compared to mono-digestion of CG (218 mL bioH_2/ gTVS). Under mesophilic conditions, the maximum production reached 415.45 mL bioH_2/gTVS with the 80 % FVW and 20 % CG ratio, showing a 5.44 % increase compared to FVW alone (394 mL bioH_2/gTVS) and a 108.55 % increase compared to CG (199.20 mL bioH_2/gTVS). The second phase of the study involved applying hybrid (thermal-alkaline) pretreatment to FVW and hydrothermal to CG. This pretreatment resulted in a 315 % increase in soluble chemical oxygen demand (SCOD) solubilization, consequently enhancing the overall bio-hydrogen yield by 17.5 %. A kinetic analysis, incorporating model fitting with three models (modified Gompertz model (GM), transference function (TF), and first-order model), was conducted to determine which model most accurately depicted the effect on the degradation rate and ultimate bioH_2 yield.

Keys words: Dark fermentationCoffee groundsFood wasteBio-hydrogenPretreatments

Achouri Ouafa、Derbal Kerroum、Panico Antonio、Righa Lamis、Bensegueni Chaima、Zerdazi-Zamouche Rania、Bencheikh-Lehocine Mossaab

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Process Engineering Faculty, Environmental Engineering Department, University Constantine 3 Salah Boubnider, Ali Mendjeli Nouvelle Ville, Constantine, Algeria

Ecole Nationale Polytechnique de Constantine, Process Engineering, Department, Bp 75, A, Nouvelle Ville RP, Constantine, Algeria

Dipartimento di Ingegneria (DI) Universita degli Studi della Campania 'Luigi Vanvitelli', Real Casa dell'Annunziata via Roma 29, 81031, Aversa CE, Italy

2025

10.1016/j.biombioe.2025.107896

Biomass & bioenergy

Biomass & bioenergy

SCI
ISSN：0961-9534
年,卷(期)：2025.199(Aug.)
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