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New approach to agro-industrial solid and liquid waste management: Performance of an EGSB reactor at different hydraulic retention times for methane production

Author

Listed:
  • Rodrigues, Caroline Varella
  • de Oliveira Filho, Leonardo Matias
  • Camargo, Franciele Pereira
  • Souza Dornelles, Henrique de
  • Sakamoto, Isabel Kimiko
  • Maintinguer, Sandra Imaculada
  • Silva, Edson Luiz
  • Varesche, Maria Bernadete Amâncio

Abstract

This study investigated the removal of agro-industrial wastes (5 g COD L⁻1 from coffee and 0.5 g COD L⁻1 from brewery wastewater, plus 1 g L⁻1 of coffee pulp and husk) in a continuous Expanded Granular Sludge Bed (EGSB) reactor at 35 °C. The effect of Hydraulic Retention Times (HRTs) of 72h, 48h, and 24h on CH₄ yield was examined using a mixed culture of cattle manure and granular sludge. Methane yields were 201, 124.5, and 113.8 mL CH₄ g⁻1 COD for the 1st, 2nd, and 3rd phases, respectively. Volatile fatty acids, particularly acetic acid, increased at lower HRTs. Sequencing of the 16S rRNA gene on the Illumina HiSeq platform revealed a syntrophic relationship between Syntrophorhabdus, Syntrophobacter, and Pseudomonas with methanogens Methanomassiliicoccus, Methanospirillum, and Methanobacterium, aiding in the removal of phenolic compounds. The study suggests that an HRT of 72h is optimal for maximizing CH₄ production in the EGSB reactor.

Suggested Citation

  • Rodrigues, Caroline Varella & de Oliveira Filho, Leonardo Matias & Camargo, Franciele Pereira & Souza Dornelles, Henrique de & Sakamoto, Isabel Kimiko & Maintinguer, Sandra Imaculada & Silva, Edson Lu, 2024. "New approach to agro-industrial solid and liquid waste management: Performance of an EGSB reactor at different hydraulic retention times for methane production," Renewable Energy, Elsevier, vol. 237(PC).
    • Handle: RePEc:eee:renene:v:237:y:2024:i:pc:s0960148124018901
    DOI: 10.1016/j.renene.2024.121822
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    References listed on IDEAS

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    1. Pin, Bruno Vasconcelos da Rosa & Barros, Regina Mambeli & Silva Lora, Electo Eduardo & Almazan del Olmo, Oscar & Silva dos Santos, Ivan Felipe & Ribeiro, Eruin Martuscelli & Victor de Freitas Rocha, J, 2020. "Energetic use of biogas from the anaerobic digestion of coffee wastewater in southern Minas Gerais, Brazil," Renewable Energy, Elsevier, vol. 146(C), pages 2084-2094.
    2. Liu, Jianfeng & Tang, Zhengkang & Wang, Changmei & Wu, Kai & Song, Yuanlin & Wang, Xingping & Zhang, Zhiwen & Zhao, Xingling & Yang, Bin & Piao, Mingguo & Yin, Fang & Zhang, Wudi, 2021. "Novel technique for sustainable utilisation of water hyacinth using EGSB and MCSTR: Control overgrowth, energy recovery, and microbial metabolic mechanism," Renewable Energy, Elsevier, vol. 163(C), pages 1701-1710.
    3. Abumalé Cruz-Salomón & Edna Ríos-Valdovinos & Francisco Pola-Albores & Selene Lagunas-Rivera & Rocío Meza-Gordillo & Víctor M. Ruíz-Valdiviezo, 2017. "Evaluation of Hydraulic Retention Time on Treatment of Coffee Processing Wastewater (CPWW) in EGSB Bioreactor," Sustainability, MDPI, vol. 10(1), pages 1-11, December.
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