Eurobodalla Integrated Water Cycle Management Strategy

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122 Eurobodalla Integrated Water Cycle Management Strategy Treating effluent at a local facility would result in a number of options for the management of reclaimed water. Appendix P provides a detailed description of the available management options. Preliminary appraisal suggests river disposal, or agricultural reuse as the most suitable options worthy of further evaluation. Costs in Table 9-5 are based on centralised effluent drainage (CED) for transport, a local package plant for treatment and river disposal. Provision of a Full Reticulated Sewerage System An alternative to providing any on-site treatment facilities is to transfer wastewater (i.e. black and greywater) through a centralised sewer transport network to either a local treatment facility as discussed for the previous opportunity or to the Batemans Bay STP. A slight variation on this option would be to incorporate local greywater reuse and only transfer blackwater to the Batemans Bay STP. Unlike in the previous opportunity, the sewer transport pipes would need to be larger and possibly installed at greater depths. Appendix P provides a detailed description of the available transport and local treatment options. The shortlisted reclaimed water management options are the same as those discussed for the above opportunity. Costs in Table 9-5 are based on a modified gravity transport system, a local package extended aeration treatment plant and river disposal. 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 Batemans Bay 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 Nelligen for greywater reuse would reduce the volume of wastewater requiring treatment by 0.325 ML/a. If in addition, current septic tanks were converted to rainwater tanks for reuse purposes an additional 3.6 ML/a could be saved. In addition to reducing the volume of imported or reticulated water required for Nelligen, this would reduce the hydraulic load on the Batemans Bay STP. With the implementation of appropriate monitoring systems, long term environmental and water resource sustainability and public health protection could be achieved.
Eurobodalla Integrated Water Cycle Management Strategy Table 9-6 Social and Environmental Aspects of the Medium to Long Term Opportunities for Nelligen Opportunities Social Environmental Improved management of existing water supply Harvested roof water supplemented with reticulated water from the regional scheme Provision of full reticulated water system from the regional scheme Improved management of existing onsite facilities Enhanced management of existing onsite facilities Centralised management of effluent from onsite facilities Local treatment and management Transfer to Batemans Bay system Reduces demands for water and increases security Increases public awareness of water conservation issues Decreases public health risks and increases security Eliminates the need to import water Water for potable uses would meet the Australian Drinking Water Guidelines Decreases public health risk and increases security Eliminates the need to import water Provision available for fire fighting purposes Short term inconvenience for residents during construction, i.e. noise, vehicle movement Water for potable uses would meet the Australian Drinking Water Guidelines Associated odour and noise impacts Inconvenience of pumpout trucks in the area Improves air quality and visual character Enhances aesthetic appeal for the local area, good for tourism and recreational activities Solution would be tailored to match local requirements Limited additional infrastructure required Lower cost than conventional gravity Existing resources can be utilised More conservative/efficient water use Incorporates sustainable use of water resources Increases pressure on regional water sources Less pressure on local environments, however increases pressure on regional water sources Increases runoff, which may result in increased pollutant loads entering the environment Possible environmental impact during construction Improves environmental outcomes, minimises the incidence of septic effluent contaminating local waterways Reduces impact to local waterways and the environment Less overall environmental impacts than conventional gravity systems Less overall environmental impacts than conventional gravity systems Possible environmental impact during construction May allow for regional reuse 123
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FACT SHEET 3 Rainwater Tanks 18 Eur
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FACT SHEET 9 Loss Reduction 24 Euro
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38 Number of Persons 2,500 2,000 1,
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42 % Occupancy 80% 70% 60% 50% 40%
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46 Annual Volume (ML/Yr) 2,500 2,00
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48 Demand ML/a Eurobodalla Integrat
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6.5.3 Stormwater Issues 58 Euroboda
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9.14.2 What are the Issues? 202 Eur
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9.15.2 What Are the Issues? 208 Eur
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214 ML/a 8000 7000 6000 5000 4000 3
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228 SCENARIO 1 Regional Water Suppl
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