Eurobodalla Integrated Water Cycle Management Strategy

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174 Eurobodalla Integrated Water Cycle Management Strategy Table 9-27 Integrated Water Cycle Management Opportunities for Bodalla Centralised management of effluent from onsite facilities Provision of full reticulated sewerage system Cost Estimate Capital ($m) NPV @ 7% ($m) 2.57 2.85 Package Treatment Plant 2.66 2.93 Package Treatment Plant with greywater reuse of suitable systems 1 2.66 2.93 Package Treatment Plant with greywater reuse of suitable systems and roofwater harvesting utilising disinfected tanks 1 2.66 2.93 Note 1: As this is a strategy document, the saving s to Council for greywater reuse have not been costed. These option will incur greater community costs 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 effluent. This option has been priced with a package treatment plant and opportunistic reuse Reed beds are local treatment option that may be viable in Bodalla. Constructed Reed beds use passive biological systems to treat a variety of wastes such as human, animal, plant and industrial wastes. It is an extremely effective system with many environmental benefits when compared with traditional treatment options. Provision of Full Reticulated Sewerage System An alternative to on-site treatment sewerage facilities is to transfer wastewater through a Centralised sewer transport network to a treatment plant as described above. Unlike in the previous opportunities the sewer transport pipes would be larger and possibly installed at greater depths. Provision of Full Reticulated Sewerage System with Grey Water Reuse 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 Bodalla for greywater reuse would reduce the volume of wastewater requiring treatment by 1.3 ML/a. This in addition to reducing the volume of imported of reticulated water required for Bodalla, would reduce the hydraulic load on the future 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 Reticulated Sewerage System with Grey Water Reuse and Roofwater Harvesting This opportunity incorporates the components of the previous opportunity. In addition to the elements described above, systems that are not suitable for greywater reuse (e.g. septic
Eurobodalla Integrated Water Cycle Management Strategy 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 3.16 ML/a of wastewater not requiring transportation and treatment. Together with greywater reuse from aerated systems, a total of 4.36 ML/a could be saved. Social and Environmental Aspects of Medium to Long Term Water Cycle Management Opportunities The TBL assessment in Table 9-28 provides the comparative environmental and social benefits of each water cycle management opportunities. Table 9-28 Social and Environmental Aspects of the Medium to Long Term Opportunities for Bodalla Centralised management of effluent from on-site facilities Provision of full reticulated sewerage system Package Treatment Plant Package Treatment Plant with greywater reuse of suitable systems Package Treatment Plant with greywater reuse of suitable systems and roofwater harvesting utilising disinfected tanks Social Environmental Limited additional infrastructure required Use of existing resources Improved air quality and visual character Potential disturbance during construction period Limited additional infrastructure required Use of existing resources Improved air quality and visual character Potential disturbance during construction period Limited additional infrastructure required Use of existing resources Improved air quality and visual character Potential disturbance during construction period Limited additional infrastructure required Use of existing resources Improved air quality and visual character Potential disturbance during construction period 9.10.4 Integrated Water Cycle Management Scenarios Improved environmental outcomes Improved environmental outcomes More efficient use of resources as part of the regional reuse scheme Improved environmental outcomes More efficient use of resources Improved environmental outcomes More efficient use of resources Using the bundling process the above water management opportunities can be combined into integrated scenarios presents examples of integrated scenarios. Table 9-29 presents these integrated scenarios for Bodalla. 175
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xviii TABLES Eurobodalla Integrated
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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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8.3.2 Immediate Measures 84 Eurobod
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9.2 South Durras 9.2.1 Background 1
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228 SCENARIO 1 Regional Water Suppl
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