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CONTENTS

On-Site Generation of Sodium Hypochlorite 531

Electrolytic Formation of Sodium Hypochlorite Process Overview 532

531

System Components 534

Water Softener 534 Brine Saturator Tank 537 Soft-Water Heater 539 Soft-Water Chiller 540 Brine Metering 542 Electrolytic Cell 542

Brine Dilution Rectifier 546

545

Hydrogen Formation, Separation, and Safety

546

Hydrogen Dilution Blowers 553 Sodium Hypochlorite Storage Tank

556

Sodium Hypochlorite Feed Equipment 556 On-Site Sodium Hypochlorite Generation System Design

557

Equipment Sizing 557 System Redundancy 558 Amount of Sodium Hypochlorite Storage System Layout 559

559

System Manufacturers 565

ClorTec 565 Klorigen 566 MIOX 567 OSEC 567 Process Solutions, Inc. (PSI)

568

References 571

Dechlorination Introduction 572

History 572 Significance of Chlorine Species

576

Sulfur Dioxide 577 Chemical Properties

577

Dechlorination Chemistry

579

Contactor Design 580

Chemical Dose Calculations

581

Sulfite Compounds 581

Chemical Properties 581 Dechlorination Chemistry

582

xvii

572

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