关键词: EDI, 除盐水, 混合离子交换, 水质, 节能, 经济效益

Abstract: The traditional demineralized water system is based on the reverse osmosis and mixed ion exchange technology. The process is complicated, the effluent quality is poor, and a large amount of acidic and alkaline wastewater is generated during the regeneration of the mixed bed. The reverse osmosis and EDI (Electrodeionization) system has the advantages of small discharge of process wastewater, simple operation and maintenance, no acidic and alkaline wastewater. The conductivity of the produced water is reduced to below 0.1 μS/cm, and the sodium and silicon ion content is controlled below 10 μg/L, which is an ideal demineralized water system process. The application of EDI in the demineralized water system is introduced in detail. The differences in energy consumption, energy saving and emission reduction, economic benefit and operation before and after the EDI module update are compared and analyzed. Compared with the MK-2 module, the conductivity of produced water is further reduced to below 0.06 μS/cm, and it has outstanding performance in energy saving, emission reduction and economic benefits.

Key words: EDI, demineralized water, mixed ion exchange, water quality, energy saving, economic benefits