MIXED BED DEIONIZERS - Water quality from a mixed-bed system is much higher than a separate-bed system, with 18 megohm-cm (0.028 parts per million) possible. In mixed-bed deionization, cation and anion resin are mixed to produce many separate-bed, ion-exchange sites within the tank.

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Mixed Bed Deionizers

Deionization

Source: Water & Power Technologies, Inc.

Deionization is an ion-exchange process in which water flows through resin beds.

Synthetic, cation resin exchanges hydrogen ions (H ) for positive ions, and anion resin exchanges hydroxide ions (OH-) for negative ions.

Product water quality from separate-bed deionization systems is typically within the 1 megohm-cm range (approximately 1 part per million as CaC03).

Water quality from a mixed-bed system is much higher than a separate-bed system, with 18 megohm-cm (0.028 parts per million) possible.

In mixed-bed deionization, cation and anion resin are mixed to produce many separate-bed, ion-exchange sites within the tank.

In many applications, separate-bed deionization units precede mixed-bed deionizers in order to extend the life of the mixed bed and maximize the output of high-purity water.

WATERTRAK™ Mixed Bed

Source: Aquatech International Corporation

Mixed Bed deionizers are quite superior to two column deionizers in terms of the water quality they produce. As water passes through the mixed bed it has millions of chances to contact a cation bead, then an anion, then another cation and so on

An exchange takes place of course only when a positive ion contacts a negative ion and visa versa.

With each exchange the purity of the water improves because more ions are removed and held by resin beads. This repeated process will deliver water which approaches chemically '' pure'' water.

Treated water quality will be normally 0.15 us/cm conductivity, 10 PPB sodium and 10 PPB silica.

Features

·       100 PSI Carbon Steel Rubber Lined Tank

·       Three Sight Glass Windows

·       Strong Acid Cation & Strong Base Anion Resin

·       Skid Mounted Schedule 80 PVC Piping

·       PVC Hub Radial Inlet

·       PVC Header Lateral Middle Collector

·       Strainer on Plate Bottom Collector

·       Thermal Safety Valve

·       CI Butterfly Valve with SS Disc & EPDM Seat or Ball Valves

·       Inlet/Outlet Pressure Gauges

·       Thornton Conductivity Analyzer on Product

·       Signet Flowmeter on Feed

·       NEMA 4 CS Local Control Box

·       PLC Controls

Applications

·       As a working mixed bed

·       As a polishing mixed bed

·       Condensate polishing

·       When maximum silica removal is required

·       When chemically pure water is required

https://www.wateronline.com/doc/deionization-0001

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