ASTK--EDI Ultrapure Water Machine

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EDI Ultrapure Water Machine

EDI PROCESS:

EDI removes ions from water using conventional ion-exchange resins, but the resins need no chemicals for regeneration. In EDI, an electrical current is used to force a continuous migration of ions out of the feed water, through the resin bed, into the reject stream. The current also splits the water molecules into hydrogen and hydroxyl ions, and those ions continuously regenerate the resin bed.

EDI replaces the primary mixed-bed in conventional water treatment systems, predictable or consistently producing water of the highest quality.

The following requirements are the barriers that an EDI system may work properly,more restrict conditions should be considered when possible.

1.Feed water: softened single pass reverse osmosis permeate water or permeate from double pass reverse osmosis.

2.Feed water conductivity : 1-40(µs/cm). TEA(Total Exchangeable Anion)<25ppm(as CaCO₃). TEC(Total Exchangeable Cation)<25ppm(as CaCO₃).

3.pH:6.0-9.0

4.Temperature:5-35(60-95)

5.Hardness:<1.0ppm(CaCO₃)

6.Silica:<0.5ppm

7.Carbon dioxide:<10ppm.EDI may be used at high CO₂ conditions, but resistivity of purified water may be lower./P>

8.TOC:<0.5ppm

9.Transition metals: Fe<0.01ppm,Mn<0.01ppm

Benefits:

　ASTK EDI enables a Simple System (no concentrate recirculation)
　No chemical regeneration
　Lower operation cost
　Continuous and automatic process
　EDI Produces Ultrapure Water up to 18.1 Megohm
　Single Unit Capacities from 0.5 m³/hr to 3.5 m³/hr
　Compact, Lightweight, Patented Design

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