Recycling Toilet


  • Parnter Name
    Clear (Suzhou) Environmental Technology Co., Ltd
  • Partner Type
    Technology Partner
  • Contact Info
    "Tim" Cao (
  • Website
  • Descriptive Overview
    The Clear toilet uses a full-water cycling process for treatment of the sewage. A rain water collecting system can also replenish the water to the processor for self-renewal. Blackwater from the toilet is pumped up to the sewage processor for treatment and then recycled to the storage tank for flushing. An advanced unique “Biofilm-MBR” treatment process is employed as the core technology for treatment, producing a stable and clean effluent that is further disinfected to ensure safety of the effluent for reuse.
  • Key Features
    • Current design has four stalls and three urinals and can serve up to 1000 users/ day
    • Ability to operate in remote, or water-scarce conditions where there is not existing sanitation solutions such as sewers
    • Wifi and media player features available
  • Use Case Details
    Multi-unit: Design of system is most readily applicable to tourism sites, school, or public/community applications. Technology could be potentially scaled down to serve as a single household unit for up to 10 users per day.
  • Dimensions (meters)
    L 6.06m x W 5.96m x H 5.04m
  • Other Waste Accepted
    Treats solids and liquids
  • Regularly Scheduled Required Maintenance
    Membranes to be monitored and replaced as needed every two years. Solids may need to be emptied every year.
  • Use Cases
    • Single-stall Toilet
    • Multi-stall Toilet
  • Interface Type
  • Frontend Description
    Compatible with multiple front ends, currently designed as a multi-seat unit. The wastewater is grounded and listed to the treatment unit.
  • Flush Water Source
    Internal (Recycled)
  • Users per Day (Expected)
    Current design of system has four stalls and three urinals and can serve up to 1000 users/day.
  • Users per Day (Maximum)
  • Type of Waste Treated
    Solids Processing
  • Core Processing Technology
  • Processing Overview
    Initially treated with physical precipitation using a special aerobic media in the aerobic reactor. Proprietary bacteria specifically developed for treating wastewater is attached on the media as a biofilm.
  • Processing Parameters
    The biofilm can effectively biodegrade more than 50% of the organic pollutants and reduce its concentration.
  • Type of Waste Treated
    Liquids Processing
  • Core Processing Technology
    Membrane Filtration
  • Processing Overview
    The wastewater is treated by a MBR (membrane biological reactor) to separate large size pollutants that can be refluxed in the biodegrade process producing clean water. Produced clean water is further disinfected via UV to kill all bacteria in the water.
  • Power Systems Overview
    The system requires external power either from grid electricity, or from solar panels. Estimated requirement is 5.65 kWh / day.
  • Energy Balance
    No energy is recovered. Energy is used in the process.
  • Capital Expense Estimate (USD)
  • Capital Expense Estimate Notes
    $50,000 for TT-1 model
  • Operating Expense Estimate (USD)
  • Operating Expense Estimate Notes
    Estimated daily operating cost is $0.03 per user/day. Operating expense estimate assumes the maximum of 1,000 users per day at 365 days per year
  • Current: Cost per user per day (USD)
  • Expected Design Lifetime (Years)
  • Currently in Active Development
  • Commercialization Status
    Ready To Purchase
  • Commercialization Activities
    Over 100 units have been sold and are in operation at sites across China.
  • Intellectual Property Status
  • Frequency of Emptying Outputs
    Solids may need to be emptied every year.
  • Nutrient Reuse
    Water is recycled to be self-sustaining. No products are produced for reuse.
  • Linked Enabling Components
  • None linked
  • Linked Processing Technologies
  • None linked
Patent Number Description Link
CN107587575 Circular water flushing toilet in tourist attractions Link