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<p>A novel bacterial consortium comprising <i>Bacillus paralicheniformis</i>, <i>Bacillus atrophaeus</i>, and <i>Bacillus amyloliquefaciens</i> was developed to enhance the decomposition rate of sugarcane bagasse through targeted microbial activation under Iranian climatic conditions. This study uniquely characterizes the complementary enzymatic profiles of consortium members, specifically focusing on their distinct ligninolytic and cellulolytic functions. Among the strains, <i>B. amyloliquefaciens</i> exhibited the highest enzyme activities, producing key enzymes such as endo-β-1,4-glucanase (2.68 U/ml) and exo-β-1,4-glucanase (3.68 U/ml). Consortium treatments at 0.5%, 1%, and 1.5% (w/w) led to rapid attainment of thermophilic phase, pronounced reduction in C/N ratio, and increased degradation of organic content over 60 days. Additionally, bioactivator application significantly improved the availability of essential nutrients and micronutrients in compost, with notable increases in copper (91%) and manganese (56%). This work provides the first systematic dose-response assessment for this novel multi-strain consortium, integrating enzyme activity profiling for effective lignocellulose breakdown in agro-industrial waste. The distinctive approach presented here offers practical potential for advancing sustainable bioprocessing and crop residue management in intensive agricultural settings.</p> Graphical abstract <p></p>

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Microbial bioactivators for the accelerated composting of agricultural wastes: a case study on sugarcane bagasse

  • 期刊论文

  • 发表日期：

    2026年3月9日

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  • Hossein Kari Dolatabad,
  • Hossein Saffari,
  • Seyed Hossein Mahmoodi Nezhad Dezfully

摘要

A novel bacterial consortium comprising Bacillus paralicheniformis, Bacillus atrophaeus, and Bacillus amyloliquefaciens was developed to enhance the decomposition rate of sugarcane bagasse through targeted microbial activation under Iranian climatic conditions. This study uniquely characterizes the complementary enzymatic profiles of consortium members, specifically focusing on their distinct ligninolytic and cellulolytic functions. Among the strains, B. amyloliquefaciens exhibited the highest enzyme activities, producing key enzymes such as endo-β-1,4-glucanase (2.68 U/ml) and exo-β-1,4-glucanase (3.68 U/ml). Consortium treatments at 0.5%, 1%, and 1.5% (w/w) led to rapid attainment of thermophilic phase, pronounced reduction in C/N ratio, and increased degradation of organic content over 60 days. Additionally, bioactivator application significantly improved the availability of essential nutrients and micronutrients in compost, with notable increases in copper (91%) and manganese (56%). This work provides the first systematic dose-response assessment for this novel multi-strain consortium, integrating enzyme activity profiling for effective lignocellulose breakdown in agro-industrial waste. The distinctive approach presented here offers practical potential for advancing sustainable bioprocessing and crop residue management in intensive agricultural settings.

Graphical abstract