Greywater recycling by Nubian Water Systems
Greywater recycling in apartment blocks, hotels, schools, townhouses and
commercial buildings is now feasible using Nubian's OASIS greywater recycling process in
the system design. Engineers are seeking compact, above ground equipment that allows
recycling for irrigation or internal reuse in toilets and laundries.
Property investors, offering sustainable "Green Buildings" to environmentally responsible
tenants, can install economic OASIS systems that save substantial amounts of drinking water -
up to 60% of conventional usage patterns. Nubian has a portfolio of active projects in
apartments, offices, hotels, schools and mine sites throughout Australia.
Nubian launched its OASIS domestic greywater treatment system late in Dec 2006, and has a
growing number of residential installations in VIC, NSW, ACT, and QLD, where the system's
high water quality has been accredited for reuse internally in laundries and toilets, and
for above ground irrigation. In WA and SA recycled water can be used for above ground
irrigation. Nubian is currently working with regulators and consultants to achieve system
validation, under the National Water Recycling Guidelines to facilitate the use of the
technology in commercial and multi dwelling projects.
Nubian's OASIS technology is Australian with global patents pending. It uses the well
proven wastewater treatment processes of solids separation, biological treatment and
ultraviolet disinfection. The biological treatment step is the heart of the technology,
and is an innovative form of aerated biofilter, which provides very high rate processing
and is very robust in its ability to deal with varying and shock loads, which are typical
of residential greywater. Treated water is of a high quality, with BOD and Suspended Solids
levels typically less than 5 ppm. The high UV dosage consistently delivers Faecal Coliform
levels close to zero. The system is fully automated, and is designed to require no user
intervention between scheduled service calls. On-line and remote monitoring devices can be
added, and these can integrate with building automation systems.
Greywater recycling offers consistent water availability to overcome drought and water
restrictions. Architects can design sustainable buildings which can still offer residents
lush gardens and water features, using water that would otherwise be destined for the sewer.
Greywater treatment systems that are above ground and discreet in size, are increasingly
being requested for inclusion in "green buildings." In addition to the saving in mains
water consumption, there is a reduced load on sewage systems with greywater treated and
recycled rather than going to sewer.
The two system options are with the existing OASIS GT600 / Megalitre processors and a new
larger 5000 Lpd unit. Linking OASIS multiple processors in parallel on a skid mounted system,
together with a common greywater collection and screening system provides an immediately
available, scalable plant suitable for daily hydraulic loads of up to 15,000 litres per day.
Risk management can be enhanced with optional ultra filtration, chlorination, and real time
monitoring. Recycled water can be stored with rainwater in common tanks if overflows are
managed to ensure excess rainwater goes to stormwater, and excess recycled water goes to sewer.
Nubian is currently developing a larger biological treatment module to treat 5,000 litres
per day each. A group of these in a common system would occupy a single parking space in a
car park or be housed in a 20 foot container. It would be capable of treating up to 40,000 Lpd.
Property developers will use clusters of these systems in large estates, processing
greywater and irrigating common land, gardens and even reticulating into groups of houses.
Recycling treated water back into residences can reduce drinking water by more than 40%
and sewer discharge by 60% - promising substantial savings in capex reticulation of
sewage processing facilities and ongoing charges. OASIS greywater processors are attracting
attention from the commercial sector because of the simplicity of integrating into
engineered sustainable architectural designs. The systems are very space efficient. It
makes achieving environmentally responsible buildings a lot easier.
For further information contact:
Nubian Water Systems Pty Ltd
Address: Unit 3, Gateway Business Park, 63-79 Parramatta Road, Silverwater, NSW, 2128
Phone: 02 9647 2....
Fax: 02 9647 2....
Web: www.nubian.com.au
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