Copper Alliance HSDG Australia

Desalination plants operating
throughout every state in Australia
Areas that are supplemented by
desalinated water include:
• Sydney, NSW
• Melbourne, Vic
• Adelaide, SA
• Perth, WA
• Coober Pedy, WA
• Penneshaw, SA
• Marion Bay, SA
• Gold Coast, Qld
Private Black And Grey Water Treatment
Systems
Black and grey water reuse is similar to
towns mains recycled supply as described
previously in this section. Black and grey
water reuse is generally associated with
private small scale waste water treatment
systems in residential and commercial
buildings.
The reason a building owner installs a
black and grey water treatment system
is to reduce the reliance on the town’s
main water supply and to increase the
environmental sustainability of the building.
Black and grey water systems must be
designed and installed correctly. There is
a risk to the public and building occupants
if a treatment system fails. The design of
a black and grey water system must be
designed by a suitably qualified person and
before installation commences be approved
by the relevant regulatory authority.
The designer, installer and building owner
must also be aware of the federal, state and
local government approvals process when
installing a treatment system.
The designer, installer and building owner
shall be aware of the operational and
maintenance responsibilities associated
with operating a wastewater treatment plant.
Black And Grey Water Sources Within
A Building
Generally there are three sources of
wastewater within a building. These
sources of wastewater are:
Black Water
Black water is a portion of the wastewater
stream that originates from toilet fixtures.
Grey Water
Grey water is captured from non-food
preparation sinks, showers, baths, spa baths,
clothes washing machines, and laundry tubs.
Reject Waste Water
Reject waste water is wastewater that
cannot be treated for reuse within the
building. Reject waste water includes
cooling water bleed off water, fire
sprinkler system drain down water, trade
waste water and grease water etc.
Rejected wastewater can be treated
for reuse but generally isn’t, due to the
excessive cost associated additional
pretreatment systems.
Black and Grey Waste Water Treatment
Systems
Black water (Figure 5.3) and Grey water
(Figure 5.4) reuse has been identified as
an alternate water source to supplement
the drinking water supply similar to
rainwater harvesting.
When deciding on a waste water system
the designer and building owner must select
a system that achieves the required water
reduction targets from the town’s water main.
The wastewater treatment system is limited
to the amount of black and grey water that
is generated within the building.
Hydraulic Services Design Guide - 5 th Edition March 2022
Chapter Five
38
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