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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

GREYWATER SYSTEMS

N MEHLIKA KAYAALP

PRINCIPAL ADVISER WASTEWATER

Department of Human Services

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

definitions
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

greywater charecteristics
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

greywater reuse systems
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

greywater reuse systems 2
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

dhs wastewater webpage
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

slide8
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

slide9
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

slide10
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

slide11
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

greywater reuse systems 1
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

greywater reuse systems 213
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

greywater interstate
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

greywater diversion device
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

greywater diversion device 2
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

greywater diversion device 3
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

greywater diversion device 4
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

greywater diversion device 5
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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