A recent study published in Nature Catalysis introduces an innovative electrochemical method to extract urea from urine and convert it into a valuable fertilizer.

• The process enhances urban wastewater treatment while promoting sustainable agriculture.

About the Process

• Transformation of Urea: Urea, a nitrogen-rich compound in urine, is converted into percarbamide, a crystalline peroxide derivative.
• Dual Benefit 
• • Facilitates urine treatment in urban wastewater systems.
  • Converts waste urine into an eco-friendly agricultural resource.

Chemical Process Involved

• Electrochemical Conversion: Urea (CH₄N₂O) undergoes electrochemical splitting, forming ammonia, hydrogen ions (H⁺), and reactive intermediates.
• Hydrogen ions interact with urea to produce per carbamide in the presence of an activated graphite-carbon catalyst.
• Catalyst Role: Activated graphite-carbon enhances hydrogen bonding, increasing efficiency.
• It accelerates two reaction pathways leading to per carbamide formation.

Advantages of Percarbamide

• Sustainable Nutrient Release: 
• • Gradual nitrogen release supports long-term plant growth.
  • Slow oxygen release enhances soil aeration and root respiration.
• Environmental Benefits: Prevents eutrophication by controlling nutrient runoff into water bodies.
  • Promotes efficient nutrient recycling from urine, reducing chemical fertilizer dependency.

Potential Applications

• Urban Wastewater Management: Enhances nutrient recovery in wastewater treatment plants. Provides an eco-friendly alternative to traditional waste disposal.
• Agricultural Use: Ideal for sustainable farming, especially in resource-limited regions. Reduces reliance on synthetic fertilizers while improving soil health.

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