OASIS Domestic Grey Water Treatment System White Paper Contents 1 Introduction 3 2 Nubian Water Systems 4 3 Technology and Performance 5 3 1 Treatment Processes 5 3 2 Mechanisms for Organics Nutrients and Pathogen Removal 5 3 3 Flow Management 5 3 4 Expected Performance 6 3 5 Control and Operation 7 4 5 Installation and Operation 8 4 1 Maintenance Requirements 8 4 2 Required Infrastructure 8 4 3 Typical Applications and Size 9 Non Technical Information 10 5 1 Economics 10 5 2 Environmental 10 5 3 Intellectual Property 10 Company contact details 11 Attachment A System Configuration 12 6 2 12 1 Introduction Nubian Water Systems was established by to provide a range of leading urban water management solutions The OASIS Domestic Greywater Treatment System described in this document has been developed for use in single dwelling multi dwelling commercial and industrial applications It has been designed for integration with existing water and sewage infrastructure It has been accredited to the highest level of re use options by NSW Health 3 12 2 Nubian Water Systems Nubian Water Systems has developed a range of leading urban water solutions applicable to residential commercial and industrial properties Borne out of the need for intelligent and effective water management practices Nubian Water Systems provides both standard products and tailored packages to meet individual needs Nubian Water Systems aims to instigate the paradigm shift necessary to rescue Australia from the current water crisis and lead the field in providing effective local level water management systems and solutions Nubian Water Systems has an engineering alliance with GHD GHD is an international multidisciplinary consultancy that provides engineering management and environmental services with over 75 years of experience Currently GHD has an integrated network of 62 offices and over 3 500 personnel in Australia the Middle East Asia New Zealand and the Americas and ranks in the worlds top 50 engineering and architecture firms GHD is a national leader for experience expertise and reputation in the water engineering discipline Nubian Water Systems is headquartered in Sydney and operates Australia wide The greywater treatment system described in this report is designed to operate as part of the Nubian domestic water management packages Packages have been prepared for rural and urban areas and single and multi dwelling premises 4 12 3 Technology and Performance The OASIS Domestic Greywater Treatment System DGTS has been designed for onsite greywater recycling in sewered and unsewered areas It treats water from baths showers and hand basins for safe reuse in toilets urinals and washing machines and for irrigation and other external applications The OASIS DGTS comprises of a feed water tank processing system incorporating a proprietary treatment column coupled with U V disinfection and a treated water storage tank 3 1 Treatment Processes The OASIS DGTS utilises three unit processes to ensure effluent quality meets the relevant standards The first stage of treatment occurs upstream of the feed water tank where a screen removes lint and other coarse materials to prevent blockages and fouling of the system The principal stage of treatment in the OASIS DGTS occurs in the treatment column where the water flows down through the non static bed of proprietary media Contaminant removal is achieved through physical removal adsorption and microbial induced aerobic degradation The physical removal mechanisms are those typical of granular medium filters straining sedimentation impaction interception and adhesion However the OASIS DGTS is superior to conventional granular medium filters as it provides additional treatment through the proprietary media The properties of the media allow a significant degree of adsorption to occur which complements the physical removal mechanisms Further the column is arranged to promote the development of an aerobic biomass on the media The combined capacities for physical removal adsorption and bacterial degradation create an extremely robust treatment system Treatment is completed through U V disinfection The System Configuration is illustrated at Attachment A 3 2 Mechanisms for Organics Nutrients and Pathogen Removal The combined treatment processes achieve a very high degree of organic nutrient and pathogen removal In the treatment column straining impaction and interception on the media cause the media to retain a high portion of organic matter and pathogens Further retention of particulate organics and dissolved organics and nutrients is achieved by adsorption Retained contaminants are discharged to sewer during the automatic backwash cycle The final stage of disinfection achieves a high kill rate of pathogenic organisms 3 3 Flow Management 3 3 1 Treatment Column The modular nature of the OASIS DGTS treatment column provides flexibility to treat any flow of greywater The nominal unit for single domestic premises has been designed to treat the peak and average flows associated with the NSW Health guidelines for a 10 person rated DGTS 720 1 080 L d However this column may be redesigned for specific applications with higher or lower flows Alternatively a bank of columns may be installed to treat larger flows of greywater such as those from 5 12 commercial industrial or multi dwelling applications Further scope to treat a range of flows is achieved through utilisation of the flow management facilities and procedures outlined below 3 3 2 Management of Peak Generation The OASIS DGTS maintains its high standard of treatment when receiving peak and low flows and loads While the treatment system has been designed to treat the flows dictated in the NSW Health guidelines it has the capacity to treat much higher and lower flows Under low flow conditions the DGTS automatically cycles the feed pump under level control Further the weir and arrangement of components ensure that the media remains submerged During periods of extended low flows a feed system may be initiated to preserve the biomass or alternatively the biomass may be allowed to reduce and regrow when flows resume This is satisfactory because the physical removal mechanisms are sufficient for treatment Peak flows are managed by a feed water balance tank which equalises flow through the treatment column The management of peak flows and loads is also dependent on the nature of the application In sewered areas the system is designed to overflow to sewer
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