Design Procedure for Dialysis to Produce Ultrapure Water

The design procedure for an electrodialysis ultrapure water process is as follows:

I. Pre-design Data Preparation

• Raw water salinity and main ionic components;

• Freshwater production rate and finished water quality requirements;

• Specifications of the electrodialysis unit and its auxiliary equipment;

• Electrodialysis unit constant and current efficiency;

II. Model and Assembly Method Selection;

III. Calculation of Required Membrane Area;

IV. Determination of Operating Parameters, mainly operating current;

V. Energy Consumption Calculation, including energy consumption of the electrodialysis unit and pumps;

VI. Economic Analysis Based on Membrane and Electricity Prices to Find the Optimal Current Density and Minimize Process Costs;

VII. On-site Testing and Design Modification.