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<p>The present study establishes a sustainable and integrated framework to maximize feedstock valorization by coupling biohydrogen (bio-H₂) production with organic nutrient recovery for agricultural application. The study was conducted in two sequential phases. In the first phase, food waste was utilized as a substrate in a hybrid semi-pilot-scale biofilm reactor for dark fermentation. The system achieved a cumulative bio-H₂ production of approximately 85&#xa0;L, alongside the generation of 14,112&#xa0;mg/L of volatile fatty acids (VFAs). The predominant fermentative metabolites identified were acetate, butyrate, and propionate, indicating stable acidogenic activity and efficient substrate conversion. In the second phase, the VFA-rich acidogenic effluent (AE), representing the liquid fraction of the bio-H₂ process, was evaluated for its agronomic potential as a phosphate-solubilizing amendment in chickpea (<i>Cicer arietinum</i>) cultivation. To assess VFA-mediated solubilization, tricalcium phosphate [Ca₃(PO₄)₂], an insoluble phosphorus source, was incorporated into the soil. Periodic supplementation of AE, diluted with water, was applied throughout the growth period. The results demonstrated that regular supplementation of AE significantly enhanced phosphorus solubilization and uptake, resulting in a 2.45-3.01-fold increase in phosphorus accumulation compared to the control. This improved nutrient availability translated into enhanced plant vigor and overall growth performance. Collectively, these findings highlight the potential of AE as a sustainable alternative or complement to conventional phosphate-solubilizing biofertilizers, thereby linking renewable energy production with circular nutrient management in organic farming systems.</p>

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Potential application of acidogenic effluent from dark fermentation process as a phosphate solubilizing organic liquid fertilizer

  • 期刊论文

  • 发表日期：

    2026年4月2日

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  • Sulogna Chatterjee,
  • Omprakash Sarkar,
  • S. Venkata Mohan

摘要

The present study establishes a sustainable and integrated framework to maximize feedstock valorization by coupling biohydrogen (bio-H₂) production with organic nutrient recovery for agricultural application. The study was conducted in two sequential phases. In the first phase, food waste was utilized as a substrate in a hybrid semi-pilot-scale biofilm reactor for dark fermentation. The system achieved a cumulative bio-H₂ production of approximately 85 L, alongside the generation of 14,112 mg/L of volatile fatty acids (VFAs). The predominant fermentative metabolites identified were acetate, butyrate, and propionate, indicating stable acidogenic activity and efficient substrate conversion. In the second phase, the VFA-rich acidogenic effluent (AE), representing the liquid fraction of the bio-H₂ process, was evaluated for its agronomic potential as a phosphate-solubilizing amendment in chickpea (Cicer arietinum) cultivation. To assess VFA-mediated solubilization, tricalcium phosphate [Ca₃(PO₄)₂], an insoluble phosphorus source, was incorporated into the soil. Periodic supplementation of AE, diluted with water, was applied throughout the growth period. The results demonstrated that regular supplementation of AE significantly enhanced phosphorus solubilization and uptake, resulting in a 2.45-3.01-fold increase in phosphorus accumulation compared to the control. This improved nutrient availability translated into enhanced plant vigor and overall growth performance. Collectively, these findings highlight the potential of AE as a sustainable alternative or complement to conventional phosphate-solubilizing biofertilizers, thereby linking renewable energy production with circular nutrient management in organic farming systems.