40 Mount Street Case Study
Investa's new development at 40 Mount Street will include a greywater recycling system that will capture and store for reuse rainwater from the roof, stormwater, fire sprinklers test water and condensate water from air conditioning. The rainwater is to be captured from box gutters using syphonic gutter outlets. A syphonic system operates by causing a vacuum to form which sucks the water into the downpipes only when full, unlike a traditional gravity system which operates with small volumes of water. Syphonic systems are more environmentally-friendly for a number of reasons. They require fewer pipes compared with gravity systems (up to 80% less) and therefore use less materials and require less ground work in construction. Syphonic systems are also self-cleaning because they operate only under high flow rates therefore minimising maintenance.
The rainwater and greywater at 40 Mount Street will be captured in a 50,000 litre water collection tank. A pump will take the rainwater collected in the reuse water tank and pump it through automatic backwash filtration and bag filtration into a greywater treatment plant, before the chlorination and UV treatment stage. The rainwater system will ultimately join with the wastewater discharge to be treated by the same recycling plant.
The recycled (non-potable) cold water service from the tank will supply the following:
- Flushing of WCs.
- Mechanical makeup water.
- Hose taps used for wash down.
- Landscape irrigation services.
Water consumption in the development will be minimised by using High WELS (Water Energy Labelling Scheme) rated fittings, taps, showers and WCs (plus waterless urinals) and ensuring that onsite landscaping comprises drought resistant planting.
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