Electrodeionization (EDI) technology is now being applied in new process designs at several recently constructed power plants. This paper describes utilization of the EDI process on several feed water sources at zero liquid discharge power plants. The challenge to EDI as a critical process operation lies in both changes in feed composition and varying flow rates as a result of changes in plant operating modes.

This paper has discussed in detail EDI performance against the backdrop of complex integrated membrane systems. The EDI units are designed to operate continuously even while the plant changes operating modes. EDI units have demonstrated stable operation for long periods, and, when cleanings are required, full performance has been restored.

Authors: Ted Prato and Chris Gallagher (formerly Ionics) Reprinted from International Water Conference