Eurobodalla Integrated Water Cycle Management Strategy

182
Eurobodalla Integrated Water Cycle Management Strategy
The costs in Table 9-31 is based on modified gravity transport system with transfer to the
Bodalla STP.
Provision of Full System with Greywater Reuse
On-site systems that achieve a suitable level of treatment for greywater would be
maintained, and blackwater only would be transported to the Bodalla STP using the
reticulation systems described above. The resulting greywater could then be utilised for a
variety of outdoor uses and for toilet flushing. Maintaining current aerated systems in Potato
Point for greywater reuse would reduce the volume of wastewater requiring treatment by
2.7 ML/a. This in addition to reducing the volume of imported of reticulated water required
for Potato Point, would reduce the hydraulic load on the Bodalla STP. With the
implementation of appropriate monitoring systems, long term environmental and water
resource sustainability and public health protection could be achieved.
Provision of Full System with Grey Water Reuse and Roof water harvesting
This option is as per the previous option, with the incorporation of rainwater tanks. Systems
that are not suitable for greywater reuse (e.g. septic tanks) would be de-sludged and
disinfected and used to collect roofwater for non-potable uses including garden watering
and toilet flushing. This would result in an additional 3.68 ML/a of wastewater not requiring
transportation and treatment at the Bodalla STP. Together with greywater reuse from
aerated systems, a total of 6.38 ML/a could be saved.