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CONTENTS

Chemistry of Wastewater Disinfection by Chlorine

Reactions with Wastewater Constituents 379 Chlorine Dose and Effluent Quality 382 Chlorination of Nitrified Effluents 384

Formation of DBPs 390 Other Disinfection Considerations 394

Regrowth of Organisms 394 Toxicity of Chlorine Residuals 395 Need for Dechlorination 396

Wastewater Reuse 397 References 400

Chlorine Contact Basin Design

Introduction 404 Design Elements 405

Chlorination and Dechlorination Doses Dispersion of Chlorine 405 Mixing Technologies 406 Chlorine Contact Chamber Sizing Wastewater 413 Reuse Water 413 Potable Water 414 No-Tracer Test Design 416 Wet Weather Disinfection for Wastewater Chlorine Contact Basin Construction 417 Disinfection By-products 417 Sampling and Reporting 417 405 411 416

References 417

Chlorine Feed Systems

Cylinders 420 Ton Containers 424 Tank Trucks/Tank Cars Storage Tanks 430 Liquid Chlorine Feed

427

431

Vaporizers 431 Appurtenances 436

Pressure-Reducing Valve Gas Filter 437 Gas Chlorine Feed 438

436

379

404

418

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