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CONTENTS

Contactor Design 582 Chemical Dose Calculation 583

Other Dechlorination Chemicals 583 Dechlorination Facility Design 585

Design of Gaseous System Sulfur Dioxide Sulfur Dioxide Leak Detectors 589 Liquid System Design for Sulfites 592

586

References 593

Process Controls for Chlorination and Dechlorination

Introduction 594 Background 596 Online Analytical Measurements

598

Amperometry 598 Voltametry 599 Polarography 599 Membrane Cell 600 Potentiometry 600

Online Analyzers for Chlorination Analytical Technology, Inc. 608

607

Hach 611 Capital Controls 614 GLI International 619 Orion Research, Inc. 620 Wallace & Tiernan 621 Stranco Products 622 Field Comparison of Analyzers

629

ORP 602 Colorimetry

606

How to Select an Online Analyzer 631

Online Process Control Overview 633 Chlorination Process Control 637

Manual Control 638 Flow Pacing 641 Feedback Control 644 Compound Loop Control

647

Dechlorination 653

Flow Pacing 654 Feedback Control 654 Compound Loop Control 654 Zero Residual Control 655

594

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