1. Introduction 2. Nubian Water Systems 3. Technology and Performance 3.1 Treatment Processes 3.2 Mechanisms for Organics, Nutrients and Pathogen Removal 3.3 Flow Management 3.3.1 Treatment Column 3.3.2 Management of Peak Generation 3.3.3 Management of Peak Demands 3.4 Expected Performance 3.4.1 Treatment Column Performance Analysis 3.4.2 Removal of Organics and Nutrients 3.4.3 Pathogen Control 3.5 Control and Operation 3.5.1 Procedures and Practices 3.5.2 Integration with Centralised Management System (SCADA monitoring and control, or equivalent with appropriate alarms 4. Installation and Operation 4.1 Maintenance Requirements 4.1.1 NSW Health Accreditation 4.1.2 Ongoing Maintenance 4.1.3 Warranty and Support 4.2 Required Infrastructure 4.2.1 Collection and Distribution 4.2.2 Integration and Redundancy 4.3 Typical Applications and Size 5. Non-Technical Information 5.1 Economics 5.2 Environmental 5.3 Intellectual Property 6. Company contact details Attachment A - System ConfigurationOASIS Domestic Grey Water Treatment System White Paper2/12 1111Contents 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. Installation and Operation 8 4.1 Maintenance Requirements 8 4.2 Required Infrastructure 8 4.3 Typical Applications and Size 9 5. Non-Technical Information 0 5.1 Economics 10 5.2 Environmental 10 5.3 Intellectual Property 0 6. Company contact details 1 Attachment A - System Configuration 23/12 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.4/12 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.5/12 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 from6/12 commercial, industrial or multi-dwelling
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