Eurobodalla Integrated Water Cycle Management Strategy

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196 Eurobodalla Integrated Water Cycle Management Strategy Another alternative is to upgrade the septic system to one that achieves nutrient removal and therefore results in a higher quality effluent discharge (e.g. aerated tanks). This would increase the potential uses of the treated effluent. Both these options would minimise the potential of environmental degradation as well as reducing the likelihood of public health issues and odour complaints. Centralised Management of Effluent from On-site Facilities As an alternative to providing a full reticulated sewage system, the effluent from existing onsite systems (e.g. septic tanks) could be collected and transported to a central treatment facility. This type of system relies on smaller pipes than those required for a conventional reticulated sewerage system. Pipes can be laid in the ground at a lesser gradient and at a more shallow depth than that of conventional gravity sewerage, as the solids are captured by the on-site system and the pipes only need to carry liquid wastewater. Appendix P provides a description of the available effluent transport and local treatment options. The effluent could also be transported to Narooma STP for treatment. The reclaimed water could also be managed in a number of ways, if the effluent was treated at a local treatment facility. Appendix C provides a detailed description of the available management options. Preliminary appraisal suggests dunal infiltration and agricultural reuse are suitable disposal methods. Costs in Table 14.1 are based on Centralised effluent drainage (CED) for transport, a reed bed system for treatment and dunal infiltration as an opportunity or transfer to the Kianga STP as an alternative. Provision of Full Reticulated Sewerage System An alternative to on-site sewerage treatment facilities is to transfer wastewater through a centralised sewer transport network to either a local package treatment facility or to Kianga STP. Unlike in the previous opportunity the sewer transport pipes would 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 9-39 are based on a modified gravity transport system, a local package extended aeration treatment plant and dunal infiltration. Provision of a Full reticulated sewerage system with greywater reuse and roof water harvesting On-site systems that achieve a suitable level of treatment for greywater would be maintained, and blackwater only would be transported to the 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 Mystery Bay for greywater reuse would reduce the volume of wastewater requiring treatment by 3.35 ML/a. This in addition to reducing the volume of imported of reticulated water required for Mystery Bay, would reduce the hydraulic load on the Kianga STP. With the implementation of appropriate monitoring systems, long term environmental and water resource sustainability and public health protection could be achieved. 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 2.32 ML/a of wastewater not requiring transportation and treatment at the Kianga STP. Together with greywater reuse from aerated systems, a total of 5.67 ML/a could be saved.
Eurobodalla Integrated Water Cycle Management Strategy Table 9-40 Social and Environmental Aspects of The Medium to Long Term Opportunities for Mystery Bay Opportunities Social Environmental Improved management of existing on-site facilities Enhanced management of existing on-site facilities Centralised management of effluent from onsite facilities Provision of full reticulated sewerage system Local treatment and management Transfer to Narooma system Local treatment and management Local treatment and management with greywater reuse Transfer to Narooma system Associated odour and noise impacts Inconvenience of pumpout trucks in the area Improved air quality and visual character Enhanced aesthetic appeal for the local area, good for tourism and recreational activities Potential disturbance during construction period Solution would be tailored to match local requirements Potential disturbance during construction period Limited additional treatment infrastructure required Existing resources can be utilised Potential disturbance during construction period Solution would be tailored to match local requirements Solution would be tailored to match local requirements Larger capital investment required Short term inconvenience for residents during construction i.e. noise, vehicle movement Solution would be tailored to match local requirements Larger capital investment required Short term inconvenience for residents during construction i.e. noise, vehicle movement Decreased reticulated water demands Decreased hydraulic and biological loads on the system Limited additional treatment infrastructure required Existing resources can be utilised Short term inconvenience for residents during construction i.e. noise, vehicle movement Improved environmental outcomes, minimises the incidence of septic effluent contaminating groundwater Reduced impact to local waterways and the environment Would encourage local reuse and recycling Less overall environmental impacts than conventional gravity systems Possible environmental impact during construction Less overall environmental impacts than conventional gravity systems May allow for regional reuse Improved quality of effluent discharged to environment Increased opportunities for effluent reuse Possible environmental impact during construction Significantly reduced likelihood of groundwater contamination Improved quality of effluent discharged to environment Increased opportunities for effluent reuse Possible environmental impact during construction Significantly reduced likelihood of groundwater contamination Improved quality of effluent discharged to environment Increased opportunities for effluent reuse Possible environmental impact during construction Significantly reduced likelihood of groundwater contamination 197
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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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9.5 Mogo 9.5.1 Background 140 Eurob
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