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    Commercial Greywater

    Diversion Potential:
    595K Tons

    Economic Value Per Ton:

    GHGs Reduced:
    0K Tons

    Jobs Created:
    0 Jobs


    An on-site treatment technology, greywater aerobic digesters use combinations of nutrients or enzymes and bacteria to break food organics down until soluble, where it is flushed into the sewage system


    • Units are expensive, ranging from $40,000 to $75,000, and are more popular in Europe and East Asia where higher landfill fees offer a faster economic payback than in the U.S.
    • There is limited transparency of biological processes and the nature of material going down the drain, which is a major concern of municipal water authorities responsible for preventing pipe clogs and running WRRFs.
    • These units can be controversial since they do not fully digest the food scraps and may require additional processing by WRRFs, which may or may not have the capacity for processing in place.
    • Units require electricity to operate and release greenhouse gases during partial digestion, leading to uncertainty regarding environmental impacts.

    Stakeholder Actions

    • Nonprofits and manufacturers can conduct additional research on biological processes and potential environmental impacts to ensure commercial greywater systems do not have adverse and unintended impacts.
    • Large restaurants or cafeterias can research whether a three- to five-year payback period is achievable through waste collection savings.

    Examples & Resources

    • The Intercontinental Miami uses ORCA, a popular commercial greywater system, to reduce its monthly waste bill by $2,600 per month.

    Related Solutions

    Top Rated Solution:
    Largest Waste Diverted
    Most Jobs Created

    Centralized Anaerobic Digestion (AD)

    A series of biological processes in which microorganisms break down biodegradable material in the absence of oxygen resulting in two end products: biogas and digestate. There are many different AD technologies, including wet and dry versions, the latter being generally better suited for food waste mixed with yard waste.

    $21 /ton
    in financial benefit

    1884 K tons/yr
    in diversion potential

    0 M meals/yr
    meals recovered

    1179 K tons/yr
    in GHG reduction

    0 B gal/yr
    in water conservation

    jobs created

    Learn How >

    In-Vessel Composting

    Composting at small-scale at institutions or businesses with heat and mechanical power to compost relatively quickly (less than one month versus more than two months for windrow composting)

    $-95 /ton
    in financial benefit

    12 K tons/yr
    in diversion potential

    0 M meals/yr
    meals recovered

    34 K tons/yr
    in GHG reduction

    0 B gal/yr
    in water conservation

    jobs created

    Learn How >
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