Electrified Water Systems for Sustainable Water Supply and Waste Management: Electro-Deionization

As pressure mounts on global water systems due to climate change, growing populations, and resource constraints, the need for more sustainable and adaptive water treatment solutions is more apparent than ever. Electrified water treatment offers a compelling path forward. By using electrical energy to drive separation and redox reactions, these systems reduce dependence on chemical additives while allowing for fine control over treatment performance. Their ability to pair with renewable energy sources like solar and wind also makes them especially suitable for decentralized and off-grid settings. Among the various electrochemical methods, technologies such as electrocoagulation, electrooxidation, and electro-disinfection are gaining traction for their compact footprint and on-demand operation. In particular, Capacitive Deionization (CDI) and its advanced form, Flow-Electrode CDI (FCDI), are showing strong promise, not just for desalinating brackish water, but for tackling a much broader set of challenges. Recent developments in FCDI have pushed the boundaries of what electro-deionization can achieve. Beyond conventional desalination, FCDI has been successfully used to recover valuable resources like lithium and rare earth elements from battery leachates and acid mine drainage. It has also been applied to remove naturally occurring metals such as iron and manganese from groundwater. In some cases, FCDI has even been combined with advanced oxidation processes to create hybrid systems that handle both ionic and organic contaminants in a single step. These diverse applications highlight the flexibility of the technology and its potential to adapt to a wide range of water treatment needs. This talk will explore how FCDI is helping to shape the next generation of low-carbon, electrified water treatment systems. We will look at how it can be integrated with renewable energy, how it fits into modular and scalable treatment architectures, and how it works in synergy with other electrochemical processes. As the water sector moves toward net-zero goals, electro-deionization technologies like FCDI are emerging as key tools, offering energy efficiency, chemical reduction, and resilience in the face of today’s evolving environmental and resource challenges