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Using bioelectrohydrogenesis left-over residues as a future potential fertilizer for soil amendment.

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Agricultural straw waste converted into hydrogen energy produces residues that act as a potent biofertilizer. These residues contain plant growth-promoting microbes and essential nutrients, offering a sustainable alternative to chemical fertilizers.

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Area of Science:

  • Agricultural Science
  • Environmental Science
  • Microbiology

Background:

  • Agricultural straw wastes are abundant and pose disposal challenges.
  • Current inorganic fertilizers are costly and can have negative environmental impacts.
  • Dark fermentation-microbial electrolysis cells (DF-MEC) offer a method for waste bioconversion and energy production.

Purpose of the Study:

  • To investigate the potential of DF-MEC residues as a biofertilizer.
  • To analyze the microbial communities and nutrient content of the residues.
  • To evaluate the impact of these residues on plant growth.

Main Methods:

  • Utilized activated sludge in a DF-MEC system for agricultural straw bioconversion.
  • Analyzed the microbial composition of the DF-MEC residues.
  • Quantified macro- and micronutrients within the residues.
  • Applied MEC-effluent as a biofertilizer to tomato, chilli, and brinjal plants.

Main Results:

  • Residues were rich in plant growth-promoting microbes like Enterobacter, Paenibacillus, and Pseudomonas.
  • Microbial communities capable of producing phytohormones (IAA, Gibberellins) and fixing nitrogen/solubilizing phosphate were identified.
  • Adequate concentrations of essential macro- and micronutrients (N, P, K) were detected.
  • Application of MEC-effluent significantly enhanced plant growth, flowering, and fruit production.

Conclusions:

  • DF-MEC residues are a viable and sustainable alternative to costly inorganic fertilizers.
  • This technology provides a novel approach for agricultural waste management.
  • The developed biofertilizer is eco-friendly and cost-effective, promoting crop yield.