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Leopold – a Xylem brand Oxelia TM Ozone-Enhanced Biologically Active Filtration System for Sustainable Water Reuse What problem did this aim to solve? The Oxelia TM System was developed to advance the implementation of O 3 -BAF solutions as either a displacement or an enhancement to RO-based reuse treatment trains. While RO produces a high quality water, drinking water standards can be met with non-RO based solutions that are less expensive and do not generate a significant toxic brine stream that must be managed or disposed. Many utilities cannot afford RO-based solutions and/or don’t have an option to dispose of the brine stream. Furthermore, TDS levels of wastewater are often at or near drinking water standards and significant salt removal is not required. If RO is needed, O 3 -BAF as an additional barrier and pretreatment has been shown to significantly improve the performance of downstream membranes resulting in an optimized holistic solution. The Oxelia TM System has further demonstrated additional efficiencies, performance, and reliability required for critical applications like potable water reuse. Process Description Leopold’s Oxelia TM System is an advanced treatment solution leveraging ozone, filtration, and analytics to provide a fully integrated, ozone-enhanced biologically active filtration system (O 3 -BAF) that enables safe, reliable, cost-effective, and sustainable water reuse. O 3 -BAF technology has recently been demonstrated by Xylem and others to be one of the best available solutions for simultaneously inactivating pathogens and destroying chemicals of emerging concern in treated secondary effluent. The Oxelia TM System utilizes on-line sensors and real-time monitoring and control to reduce energy costs and ensure performance. What this means for the future? There are now more sustainable alternatives, like Leopold’s Oxelia TM System, that have been demonstrated and proven to effectively and safely address our water resource challenges A smartly designed advanced treatment train will create additional opportunities for utilities to implement potable reuse schemes by reducing life cycle costs and mitigating the impacts of brine stream management associated with RO systems This will ultimately result in potable reuse options being more readily available for a greater number of utilities, thereby extending water supplies in a cost-effective and efficient manner Xylem 1 International Dr. Rye Brook, NY 10573 www.xyleminc.com What is the compelling value proposition? As a key unit operation of a multiple-barrier treatment train, O 3 - BAF offers a sustainable alternative to reverse osmosis (RO) to achieve potable water reuse standards at a reduced carbon footprint and without generating a significant brine residual. The Oxelia TM System brings the following benefits to the customer: Early stage design support with state-of-the-art pilot testing equipment and services for project-specific technology evaluation and optimization Single source supplier responsible for overall system design, delivery, and service backed up with a performance guarantee Combined control platform for seamless system integration Advanced sensor network with optimized process control loops to reduce ozone costs and ensure overall system performance and regulatory compliance 1. Oxidation 2. Filtration 3. Biological Treatment What are the results? Pilot- and demonstrate-scale projects at multiple facilities with the Oxelia TM System have demonstrated the following results on secondary effluent for potable water reuse: 40% removal of total organic carbon (TOC) High removal rates of CECs (pharma, personal care products) Significantly enhances the performance of downstream unit operations: 1)increases flux rate through UF by ~2x, 2)reduces toxicity of RO brine stream, and 3)increases UV transmittance up to 90% Mitigates formation of NDMA Reduces ozone usage by 30% with optimize real-time monitoring and control while ensure consistent effluent quality Containerized Ozone System BAF Filtration Tanks MF-Ozone-BAF MF-RO-AOP Installed capital cost ~ 40% lower High Annual operation and maintenance cost ~ 50% lower High Energy Low High Consumables Low (GAC does not need to be replaced) No (RO membranes must be replaced) Residual Management Minimal Yes TDS/Salinity Removal No (use partial RO treatment if needed) Yes Destroys TOrCs and TOC Yes No (creates a residual waste stream) NDMA UV photolysis (use as needed) Removed 1.5 MGD Demonstration Unit San Diego’s’ North City Water Reclamation Plant Comparison of O3-BAF and RO Treatment Train for Potable Reuse Xylem’s Mobile Oxelia Pilot System
