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Commercial Greywater Recycling Systems

Supplier: Nubian Water Systems

Nubian's Commercial Nubian Greywater Recycling received enthusiastically by developers, builders, architects and engineers.


Greywater recycling in apartment blocks, hotels, schools, townhouses and commercial buildings, is rapidly becoming mainstream..

Property investors, offering sustainable “Green Buildings” to environmentally responsible tenants, can install economic Nubian systems that save substantial amounts of drinking water – up to 60% of conventional usage patterns.

Engineers are seeking compact, above ground equipment that allows recycling for irrigation or internal reuse in toilets and laundries.

Nubian has a portfolio of active projects in apartments, offices, hotels, schools and mine sites throughout Australia.

Nubian launched its Nubian domestic (single dwellings) greywater treatment system late in Dec 2006, and has a growing number of residential installations throughout Australia 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 currently be used for above ground irrigation in single dwellings, however accreditation for internal re-use is expected very soon. Nubian has recently achieved excellent results in validation trials and is working with regulators and consultants to achieve Australia wide system validation, under the Australian Guidelines for Water Recycling to expedite the implementation of commercial and multi dwelling projects.

Proudly Australian, Nubian has the first patents issued and others pending. Using 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 routinely delivers zero Faecal Coliform levels . 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.

To achieve the very demanding water quality and risk management requirements as outlined in the Australian Guidelines for Water Recycling, Nubian has adopted the approach of using modular "add-on" components including, ultrafiltration units, chlorination systems and continuous on-line water quality monitoring systems. These systems can be added, as required, to meet the requirements of specific projects according to regulatory requirements. Impressive log reductions of pathogens, and the provision of multiple barriers are achieved using this approach.

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.

Nubian has a number of system options, based around three different biofilter modules; the GT600, capable of treating 1,200 litres per day, the GT2K, capable of treating up to 2,500 litres per day and the GT5K, capable of treating 5000 Lpd, of residential greywater. Linking multiple Nubian biofilters in parallel, together with a common greywater collection and screening system provides an immediately available, scalable plant suitable for daily hydraulic loads of up to 50,000 litres per day.

Systems are very flexible and can be skid mounted, containerized or simply installed in simple quick connect modules into prepared internal or external spaces.

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 40 - 60% and sewer discharge by 60% - promising substantial savings in capital expenditure on reticulation of sewage processing facilities and ongoing charges.

Nubian 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.