Home' Sustainable Engineering Australia : SEA Issue 1 - 2013 Contents Trialling new wastewater disposal scheme
he Water Corporation has started work on an innovative
septic tank effluent disposal scheme for a regional
community in Western Australia.
The Water Corporation has been working closely with
the Wheatbelt Shire of Kondinin to implement the innovative
Septic Tank Effluent Disposal (STED) scheme that will be
trialled in the town of Hyden.
STED sewerage systems may be appropriate for locations
where standard sewerage treatment and disposal schemes
are likely to be uneconomical and where the failure of leach
drains in existing household septic systems can result in
environmental and health issues.
The STED scheme will take partially treated wastewater
from up to 130 existing septic tanks through a pipeline system
to a combined infiltration and evaporation effluent disposal
pond located out of town. Leach drains will be
disconnected from the septic tanks and
decommissioned as part of the trial.
If successful, the trial has the
potential to pave the way for effective
wastewater disposal at significantly
reduced costs for small rural towns.
The Western Australian Infill Sewerage Program aims to reduce
potential health and environmental risks, by capturing and treating
wastewater in a modern and safe manner.
Priorities have been set for the program which will make sewer
connection possible to over 100,000 homes, reducing the threat
posed by septic systems to our groundwater, public health and
This large program of sewerage provision is based on clear strategic
guidelines and objectives, with environmental considerations given
The Water Corporation is working with
other government agencies on a new
innovative sewerage service, which
has a major advantage of significantly
reducing construction and operational
costs compared with sewerage projects
built to metropolitan standards in
This will enable the provision of
reasonably priced sewer services with
appropriate standards to small WA
The town of Hyden has been selected to become the first rural
Western Australian town to trial the new Septic Tank Effluent
Disposal (STED) system.
The local Shire of Kondinin and a minimum of 75% of residents must
support the proposal for the STED system trial to go ahead in the
town of Hyden.
The Water Corporation will work with the Chief Executive Officer of
the Shire of Kondinin to gain approval for the scheme.
This leaflet provides some general information about the STED
system. You will receive further information and there will be
displays and meetings publicised through your local press.
You have my assurance that your views will be considered and any
decision made will be one that has the support of the majority of
Hon Bill Marmion MLA
Minister for Environment; Water
A MESSAGE FROM THE MINISTER
HYDEN SEPTIC TANK EFFLUENT DISPOSAL
(STED) SYSTEM TRIAL
The Wheatbelt town of Hyden has been selected to trial an
innovative new sewerage system – Septic Tank Effluent
STED sewerage systems may be appropriate for locations where
standard sewerage treatment and disposal schemes are likely to
be uneconomical and where the failure of leach drains in existing
household septic systems can result in environmental and
Successful STED systems have been operating since 1962 in
many small towns in South Australia.
Implementing the trial requires the support of at least 75% of
the residents of Hyden and contribution in cash or kind from the
Kondinin Shire Council equivalent at least 15% of the estimated
If the scheme is successful in Hyden, STED schemes could be rolled
out to other rural Western Australian towns that would otherwise
not enjoy the benefits of a sewerage scheme.
WHAT IS A SEPTIC TANK EFFLUENT
DISPOSAL (STED) SYSTEM?
The STED system is designed to take partially treated overflow
from the existing household septic tanks and deliver it via a
pipeline system and a pumping station to an effluent disposal
pond located a suitable distance from town.
Because the household wastewater continues to be partially
treated by the existing septic tanks, the pipes, pump station and
disposal ponds handling the effluent can be significantly reduced
in size compared with a standard infill sewerage system which
must handle all the wastewater, including solids.
Existing leach drains will be decommissioned by Water
Corporation as part of the Hyden project.
WHAT ARE THE BENEFITS OF A STED SYSTEM?
Benefits of a STED system include:
• Better public health and safety for the community
• Environmental benefits
• Proper disposal of sewage from the town
• A practical and affordable alternative to a conventional
• Significantly reduced construction and operational costs
Existing leach drains
out of town
New drain connected
from septic tank
outlet to new sewer
gravity draining to
the program click
A new scheme will take wastewater from 130 existing septic
tanks through a pipeline to a disposal site pond of town.
sustainable engineering australia issue 1 2013
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