Urine Stabilization


  • Parnter Name
    Eawag: Swiss Federal Institute of Aquatic Science and Technology
  • Partner Type
    Technology Partner
  • Contact Info
    Dr. Juri Lienert (juri.lienert@eawag.ch)
  • Website
  • Use Case Details
    Currently being designed for a single stall toilet.
  • Regularly Scheduled Required Maintenance
    Water refill, fertilizer harvest from urine treatment, and supply of chemical reagent.
  • Use Cases
    • Single-stall Toilet
  • Users per Day (Expected)
    Currently being designed for 10 users/day
  • Users per Day (Maximum)
  • Type of Waste Treated
    Liquids Processing
  • Core Processing Technology
  • Processing Overview
    Urine is chemically stabilized then undergoes passive evaporation, resulting in a solid product that can be harvested as fertilizer.
  • Processing Capacity
    20 L/day
  • Consumable Chemicals Needed
    Calcium hydroxide used for urine stabilization.
  • Power Systems Overview
    Requires power supply. Current prototype operated by solar power.
  • Energy Balance
    Requires power supply: 140 W-h/L urine current, 20-80 W-h/L urine target.
  • Currently in Active Development
  • Commercialization Status
    In Development
  • Commercialization Activities
    Field testing ongoing.
  • Intellectual Property Status
  • Frequency of Emptying Outputs
    Occasional emptying of fertilizer container
  • Nutrient Reuse
    Nutrient recovery: >70% nitrogen, >80% phosphorus, >70% potassium and others
  • Technology Development Milestones
  • Field Tests for Urine Module
    TRL: 4 (2010)
    Field tests ongoing for urine module