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GREYWATER SYSTEMS. N MEHLIKA KAYAALP PRINCIPAL ADVISER WASTEWATER Department of Human Services. DEFINITIONS. Wastewater domestic wastewater =sewage =all wastewater industrial wastewater = process wastewater Greywater domestic wastewater except toilet wastewater, or

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GREYWATER SYSTEMS

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GREYWATER SYSTEMS

N MEHLIKA KAYAALP

PRINCIPAL ADVISER WASTEWATER

Department of Human Services

M Kayaalp - Onsite Sytems Seminar - October 2003 : Greywater Systems


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DEFINITIONS

  • Wastewater

    • domestic wastewater =sewage =all wastewater

    • industrial wastewater = process wastewater

  • Greywater

    • domestic wastewater except toilet wastewater, or

    • domestic wastewater except toilet & kitchen wastewater

  • Reclaimed Water

    • derived from sewage

    • treated to a standard satisfactory for intended reuse

  • Biosolids

    • sludge

    • not “solid waste”

M Kayaalp - Onsite Sytems Seminar - October 2003 : Greywater Systems


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GREYWATER CHARECTERISTICS

  • Greywater characteristics

    (Collated from WA Greywater Code + literature)

    • E Coli: < 30 (some laundry rinse) to 108 / 100mL= all ww

    • BOD5 : medium to high (90 - 290 mg/L)

    • SS: low to high (45 to 330 mg/L)

    • P : low to high (< 1 to 27 mg/L)

    • TKN : low to medium ( 2 - 30 mg/L)

    • Na: low to high (25 - 230 mg/L)

    • conductivity : low to high: (300 - 1100 S/cm)

M Kayaalp - Onsite Sytems Seminar - October 2003 : Greywater Systems


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GREYWATER REUSE SYSTEMS

  • Reuse is supported and encouraged

    • conserves resources

    • lessens environmental pollution - if done properly

  • Reduction in waste/ wastewater production must also be aimed for

M Kayaalp - Onsite Sytems Seminar - October 2003 : Greywater Systems


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GREYWATER REUSE SYSTEMS -2

  • System DESIGN and OPERATION must consider

    • public health risks (prevent / minimise)

    • water & nutrient balance and chemicals

    • prevention of pollution of soil, groundwater, surface water , marine environment

    • reuse purpose - to be suitable to the degree of treatment and method employed for reuse

M Kayaalp - Onsite Sytems Seminar - October 2003 : Greywater Systems


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DHS WASTEWATER WEBPAGE

  • Information on

    • greywater systems

    • other alternative onsite systems

    • standard onsite systems

    • town or communal wastewater systems

    • reclaimed water

      can be found on:

      www.dhs.sa.gov.au/pehs

M Kayaalp - Onsite Sytems Seminar - October 2003 : Greywater Systems


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M Kayaalp - Onsite Sytems Seminar - October 2003 : Greywater Systems


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  • Wastewater management

  • Wastewater Management in SA

  • Standard onsite wastewater systems~ Maintaining aerobic systems~ Maintaining septic tank systems

  • Alternative onsite systems

  • Towns & other large developments

  • Product approval

  • Reclaimed water (treated effluent) reuse

M Kayaalp - Onsite Sytems Seminar - October 2003 : Greywater Systems


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  • Composting toilets or other blackwater (toilet wastewater) systems

  • Greywater systems (laundry, bath, shower, kitchen etc)

  • Reedbed systems

  • Nutrient removal systems

  • Other wastewater systems using any technology

M Kayaalp - Onsite Sytems Seminar - October 2003 : Greywater Systems


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  • If you plan to install an alternative onsite wastewater system in:

    • a SA Water sewerage area OR

    • an area serviced by a council scheme where the alternative wastewater system will not be connected to the scheme OR

    • a private scheme

  • the proposal should be discussed with the service supplier, as a full or partial exemption from any requirement for connection before the application for installation is submitted

M Kayaalp - Onsite Sytems Seminar - October 2003 : Greywater Systems


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  • Guides and Standards

    • The following guides are provided to assist in the preparation of an application for an alternative onsite system:

    • Composting toilets or other blackwater (toilet wastewater) systems

    • Greywater /sullage systems

    • Reed bed systems

  • Application Form

    • Application form for the installation of alternative onsite wastewater systems

M Kayaalp - Onsite Sytems Seminar - October 2003 : Greywater Systems


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GREYWATER REUSE SYSTEMS - 1

  • separate greywater and blackwater

    - blackwater to :

    • sewer, STED, composting toilet, ST….

  • greywater to :

    • diversion device or treatment system

  • provide appropriate treatment

  • reuse (mainly by irrigation)

    • subsurface - if not treated and/or not disinfected

    • above surface - if treated and disinfected

  • M Kayaalp - Onsite Sytems Seminar - October 2003 : Greywater Systems


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    GREYWATER REUSE SYSTEMS - 2

    • Currently, mostly at “onsite systems” areas

      • 50 REEDBED installations

      • 50 COMPOSTING TOILET installations

    • With current water restrictions inquiries increased multi fold

    • More inquiries in sewered areas

    • A circular sent to councils

    • 21 councils indicated concurrence so far incl. Adelaide metropolitan & other sewered areas

    M Kayaalp - Onsite Sytems Seminar - October 2003 : Greywater Systems


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    GREYWATER - INTERSTATE

    • Interstate approach is similar to ours

      • WA

        • Code of Practice for the Reuse of Greywater, 2003

      • Victoria

        • Reuse Options for Household Wastewater, 2001

      • NSW

        • Domestic Greywater Systems Accreditation Guidelines, 2000

        • Greywater Reuse in Sewered Single Domestic Premises, 2000

      • Queensland

        • Onsite Sewerage Code, 2002

    M Kayaalp - Onsite Sytems Seminar - October 2003 : Greywater Systems


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    GREYWATER DIVERSION DEVICE

    • A new greywater system is coming to SA

      • It diverts only bath and laundry water

      • Incorporates trench irrigation system

    • Approved- an interim approval-24 months

    • After 24 months to be re-evaluated

    • May be installed in :

      • sewered / reticulated wastewater areas, and

      • onsite systems areas

    M Kayaalp - Onsite Sytems Seminar - October 2003 : Greywater Systems


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    GREYWATER DIVERSION DEVICE - 2

    • has a filter, and

    • an overflow feature to direct wastewater (in case of blockages and/or irrigation area failure) to the main wastewater system for the dwelling, ie to:

      • sewer, or

      • STEDS drain, or

      • other communal system, or

      • onsitewcs

    M Kayaalp - Onsite Sytems Seminar - October 2003 : Greywater Systems


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    GREYWATER DIVERSION DEVICE - 3

    • Approval is issued with a warning to be on the packaging: Notice to SA users

    • Notice to SA users - warning states that

      • if the building is within a reticulated wastewater system area first check with SA Water or council or the owner / operator of the reticulated wastewater scheme - whichever is appropriate

    M Kayaalp - Onsite Sytems Seminar - October 2003 : Greywater Systems


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    GREYWATER DIVERSION DEVICE - 4

    • Notice to SA users (continued -2)

      • approval by local council or DHS

      • installation by a licensed plumber

      • it is only for laundry and/or bath water,

        NOT for kitchen wastewater

      • Gravity connection to the device and its above ground installation is required

      • with soils < 10 L/m2d permeability, reuse of greywater for irrigation is not permitted

    M Kayaalp - Onsite Sytems Seminar - October 2003 : Greywater Systems


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    GREYWATER DIVERSION DEVICE -5

    • Notice to SA users (continued -3)

    • Irrigation area must comply with all set backs stated in SA Septic Tank Codes and its supplements A & B

      • 2.5 meters from any building or boundary ,etc

      • 50 meters away from any bore, dam or watercourse;

      • above the 1956 River Murray flood level, and greater than 100 meters from its pool level;

      • at least 500 mm from the bottom of the irrigation trench to the groundwater or bedrock; and

      • in coastal areas, check with local council regarding the minimum set back from the coast

    M Kayaalp - Onsite Sytems Seminar - October 2003 : Greywater Systems


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