BOILER FEEDWATER TREATMENT: IMPROVEMENTS IN CONTINUOUS ELECTRODEIONIZATION

摘要

New developments in CEDI module construction have improved both physical integrity and module reliability while simultaneously enabling process simplification such as elimination of concentrate recirculation and elimination of salt injection into the concentrate stream. However, reliable long-term operation of an RO/CEDI system requires careful attention to process design, and in particular hardness and CO_2. With good module and system design, it is possible to design deionized water systems based on RO/CEDI that will consistently meet the makeup water quality requirements of high-pressure boilers without the use of hazardous chemicals and without creating regenerant waste.