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Evaluation of anaerobic co-digestion of spent brewery grains and an azo dye

Author

Listed:
  • Gonçalves, I.C.
  • Fonseca, A.
  • Morão, A.M.
  • Pinheiro, H.M.
  • Duarte, A.P.
  • Ferra, M.I.A.

Abstract

Anaerobic batch biodegradation of spent brewery grains (SBG) was investigated in the presence of co-substrates and a monoazo dye (Acid Orange 7 – AO7) under mesophilic and thermophilic regimes. The highest values for the yield coefficient of biogas (STP) on substrate (Ybs) were obtained under mesophilic conditions (0.381–0.516 Lbiogas/g CODremoved and 0.147 to 0.475 Lbiogas/g CODremoved for mesophilic and thermophilic regimes, respectively). A stimulation of the degradation of SBG associated with microbial growth was observed in the presence of co-substrates (glucose and acetate). Supplemented co-substrates also lowered the residual COD leading to an increase in the COD removal efficiency, particularly under thermophilic regime (from 41% to 70%). Although biogas yield (Ybs) indicates a decrease in the presence of the dye, suggesting that it has inhibitory effects, the overall COD removal was not significantly altered. An increase of colour removal was observed when the temperature of the operation was increased (87 ± 2% and 93 ± 1% for mesophilic and thermophilic reactors, respectively), which could be explained by both faster adsorption and biotic reductive cleavage of azo dye bond mechanisms. These results indicate that raw SBG is more prone to biodegradation under an anaerobic mesophilic regime; hence its bio-energetic valorisation is possible.

Suggested Citation

  • Gonçalves, I.C. & Fonseca, A. & Morão, A.M. & Pinheiro, H.M. & Duarte, A.P. & Ferra, M.I.A., 2015. "Evaluation of anaerobic co-digestion of spent brewery grains and an azo dye," Renewable Energy, Elsevier, vol. 74(C), pages 489-496.
    • Handle: RePEc:eee:renene:v:74:y:2015:i:c:p:489-496
    DOI: 10.1016/j.renene.2014.08.053
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    Cited by:

    1. Aleksandra Szaja & Agnieszka Montusiewicz & Sylwia Pasieczna-Patkowska & Magdalena Lebiocka, 2022. "Technological and Energetic Aspects of Multi-Component Co-Digestion of the Beverage Industry Wastes and Municipal Sewage Sludge," Energies, MDPI, vol. 15(15), pages 1-19, July.
    2. Zhang, Quanguo & Hu, Jianjun & Lee, Duu-Jong, 2016. "Biogas from anaerobic digestion processes: Research updates," Renewable Energy, Elsevier, vol. 98(C), pages 108-119.
    3. Chen, Guanyi & Liu, Gang & Yan, Beibei & Shan, Rui & Wang, Jianan & Li, Ting & Xu, Weiwei, 2016. "Experimental study of co-digestion of food waste and tall fescue for bio-gas production," Renewable Energy, Elsevier, vol. 88(C), pages 273-279.
    4. Gunes, Burcu & Stokes, Joseph & Davis, Paul & Connolly, Cathal & Lawler, Jenny, 2019. "Pre-treatments to enhance biogas yield and quality from anaerobic digestion of whiskey distillery and brewery wastes: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 113(C), pages 1-1.

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