EcoSan Toilet

Partner

  • Parnter Name
    Yixing Eco-Sanitary Manufacture Co. Ltd. (EcoSan)
  • Partner Type
    Commercial Partner
  • Contact Info
    Yixing Eco-Sanitary Manufacture Co., Ltd (Eco-San) Mr. Xiaokang Zhou (zhouxiaokang@hotmail.com) Yixing, Jiangsu China
  • Website
    http://www.eco-san.cn
  • Descriptive Overview
    Eco-San is one of the leading developers of the CalTech technology, focusing on school and public toilets, and containerized toilet units. The backend processing technology capitalizes on anaerobic digestion of solids and an electrolysis system to convert waste into water, hydrogen, and solid fertilizer. Eco-San is piloting three units in China, and two in South Africa. Eco-San’s sister company, Yixing Entrustech, is producing and reducing the cost of the electrodes that drive the electrolysis treatment process to make available to all partners.
  • Use Case Details
    Core processing technology scalable for school, or public/ community application; capable of servicing 50-800 users per day with one system. It is suitable for "wipe" or "wash" configurations.
  • Dimensions (meters)
    L 12 m X W 2.2 m X H 2.7 m
  • Regularly Scheduled Required Maintenance
    Solid waste should be emptied at least every 6 months, and membranes changed once per quarter
  • Use Cases
    • Multi-stall Toilet
  • Interface Type
    Various
  • Frontend Description
    Includes up to 8 toilets and urinals built into a container. Any user interface can be used. The frontend is typically located near the backend processing components. No urine/feces separation is required. Instead, mixed waste passively settles in a septic tank with anaerobic digestion. Active pre-processing with an anaerobic/aerobic system is available.
  • Flush Water Source
    External Plumbing
  • Users per Day (Expected)
    Capable of servicing 50-800 users per day with one system. Capacity is approximately 800 flushes per day.
  • Users per Day (Maximum)
    800
  • Type of Waste Treated
    Combined Stream (solids and liquids)
  • Core Processing Technology
    Electrochemical
  • Processing Overview
    Electrochemical system oxidizes the wastewater at a semiconductor anode and water is reduced at the metal cathode to form H2. Chloride in the wastewater is oxidized to reactive chlorine species, increasing disinfection.
  • Processing Capacity
    800 Flushes/day
  • Processing Parameters
    Chloride, from table salt, can be added if there is an insufficient amount in the waste. Membrane microfiltration is currently included for polishing the final effluent. Typical hydraulic retention time is more than 10 hours.
  • Consumable Chemicals Needed
    Table salt only if there is an insufficient amount of Chloride ion in the waste
  • Power Systems Overview
    Powered by solar panels mounted above the frontend, with energy storage via battery stack, and/or grid electricity.
  • Energy Balance
    Estimated 18kwh required per m3
  • Operating Expense Estimate (USD)
    5840
  • Operating Expense Estimate Notes
    Estimated operating cost of $0.02/flush/day. At a maximum capacity of 800 flushes/day, annualized operating cost may be as much as $5,840 per year (365 days).
  • Current: Cost per user per day (USD)
    0.02
  • Expected Design Lifetime (Years)
    10
  • Currently in Active Development
    True
  • Commercialization Status
    Ready To Purchase
  • Commercialization Activities
    Eco-San is piloting three units in China, two at tourist locations – a park, and a temple – and one at an elementary school. Two units are being commissioned as community ablution blocks in Durban, South Africa
  • Intellectual Property Status
    Patent Pending
  • Intellectual Property Details
    Patents pending from CalTech on the electrochemical process in the United States, India, and China. See WO 2014/058825 A1 for further information.
  • Frequency of Emptying Outputs
    Settled solids are evacuated once a year, if needed. Water is recycled for flush when operating in a closed-loop system.
  • Nutrient Reuse
    Approximately 1 ton per year of fertilizer. 4-5 cubic meters per day of usable (but not potable) water is available.
  • Liquid Emission Characteristics
    Total pathogen removal is confirmed. Water is usable, but not potable.
  • Technology Development Milestones
  • Product Available
    TRL: 8 (2018)
    1. Eco-San is piloting three units in China, two at tourist locations – a park, and a temple – and one at an elementary school. 2. Two units are being commissioned as community ablution blocks in Durban, South Africa
Patent Number Description Link
WO2014058825A1 Self-contained, pv-powered domestic toilet and wastewater treatment system. Patents pending from CalTech on the electrochemical process in the United States, India, and China Link