RESEARCH
August-September 2014 | Desalination & Water Reuse | 39 |
Scenario 3 - Direct Potable Reuse (DPR)
Advanced water treatment in scenario 2
is followed by recycling via a local
distribution tank that forms part of the
conventional potable supply distribution
system to the city. The conventional
potable water source, supply, treatment and
distribution system are all pre-existing.
Scenario 4 - Dual Pipe Reuse
New advanced treatment of secondary
effluent from six decentralized existing
modern WWTPs produce recycled water
Table 1. Characteristics of scenarios.
Sophie
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of suitable quality for non-potable uses
in greenfield areas such as toilet flushing;
outdoor uses such as of irrigation of parks;
and fire-fighting.
This scenario differs from the others
in that a new recycled water reticulation
network is assumed to be required.
CoStS
Model costs for scenario 1 were
benchmarked against Australian
desalination plants serving coastal cities
including Perth 1, Perth 2, Gold Coast,
Sydney, Melbourne and Adelaide.
Model costs for scenarios 2 and 3 were
benchmarked against Bundamba AWTP,
Western Corridor Project in Queensland,
60 Ml/d (2008-9).
Model costs for scenario 4 were
benchmarked against Pimpama Coomera,
Queensland Dual Pipe Scheme, 17 Ml/d.
The nominal total capacity of treatment
and delivery systems for all scenarios was
an average of 120 Ml/d of product water or
at least 40 Gl a year leaving the gate.
A summary of the four scenarios is
Capital costs: desalination plants
serving Australian coastal cities
including Sydney were used to
model costs in scenario 1.
