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<p>The expansion of water hyacinth in water bodies negatively impacts the water body. Anaerobic digestion is a promising method for managing this biomass. But the recalcitrant lignin hinders the effective use of lignocellulosic biomass for biogas production. This study investigated the effects of biofilm carriers derived from coffee husk in the anaerobic digestion of compressed water hyacinth juice. The experiments were conducted in upflow anaerobic sludge blanket reactors (UASB) at three different hydraulic retention times (HRT) of 2, 4, and 6&#xa0;days. Primarily, batch experiments were performed to optimize the biofilm carrier properties. The result revealed that a particle size of 1.69 mm and carbonization temperature of 578 °C activated with NaOH yield higher commutative biogas. With respect to the continuous experiments, digesters amended with biochar and activated biochar demonstrated notable improvements in cumulative methane production, with enhancements of 31.6% and 47.8% respectively compared to the control experiment at HRT of 2 days. The average chemical oxygen demand (COD) removal efficiencies were 65.5%, 72.7%, and 80.2% for the control, biochar, and activated biochar-amended reactor, respectively. The significant changes in the physicochemical properties like surface functional groups of the biochar brought by NaOH treatment, such as hydroxyl and carboxyl, can act as attachment sites for bacteria, increasing microbial colonization and activity thereby increasing anaerobic digestibility of water hyacinth juice. A large surface area provides several sites for microbial attachment and enhances biofilm formation, which promotes microbial growth and activity. As such, this research clarified that modifications of biochar with NaOH have a substantial effect on enhancing the water hyacinth juice treatment efficiency by UASB reactor.</p>

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Treatment of water hyacinth juice in an upflow anaerobic sludge blanket reactor with biofilm carriers

  • 期刊论文

  • 发表日期：

    2025年2月24日

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  • Asefash Getachew,
  • Nigus Gabbiye,
  • Surafel Argahegn,
  • Gemechu Kasseye,
  • Eshetu Getahun,
  • Hialemeriam Zewudu,
  • Zenamarkos Bantie,
  • Solomon Addisu,
  • Pranshu Bhatia,
  • Masaaki Fujiwara,
  • Shin-ichi Akizuki,
  • Shinjiro Sato

摘要

The expansion of water hyacinth in water bodies negatively impacts the water body. Anaerobic digestion is a promising method for managing this biomass. But the recalcitrant lignin hinders the effective use of lignocellulosic biomass for biogas production. This study investigated the effects of biofilm carriers derived from coffee husk in the anaerobic digestion of compressed water hyacinth juice. The experiments were conducted in upflow anaerobic sludge blanket reactors (UASB) at three different hydraulic retention times (HRT) of 2, 4, and 6 days. Primarily, batch experiments were performed to optimize the biofilm carrier properties. The result revealed that a particle size of 1.69 mm and carbonization temperature of 578 °C activated with NaOH yield higher commutative biogas. With respect to the continuous experiments, digesters amended with biochar and activated biochar demonstrated notable improvements in cumulative methane production, with enhancements of 31.6% and 47.8% respectively compared to the control experiment at HRT of 2 days. The average chemical oxygen demand (COD) removal efficiencies were 65.5%, 72.7%, and 80.2% for the control, biochar, and activated biochar-amended reactor, respectively. The significant changes in the physicochemical properties like surface functional groups of the biochar brought by NaOH treatment, such as hydroxyl and carboxyl, can act as attachment sites for bacteria, increasing microbial colonization and activity thereby increasing anaerobic digestibility of water hyacinth juice. A large surface area provides several sites for microbial attachment and enhances biofilm formation, which promotes microbial growth and activity. As such, this research clarified that modifications of biochar with NaOH have a substantial effect on enhancing the water hyacinth juice treatment efficiency by UASB reactor.