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File Name: Chlorine.pptFeb 2001
Chlorine & Chlorine Dioxide
Overview
File Name: Chlorine.pptFeb 2001
Free Chlorine
Free Chlorine exists as • Hypochlorite Ions
OCl• Hypochlorous Acid
(HOCl)
File Name: Chlorine.pptFeb 2001
Free Chlorine Sensor
ORP Reaction• HOCl diffuses through
the membrane and is reduced at the gold cathode to chloride ions and hydroxide ions.
• Silver is oxidized to silver chloride at the anode.
The current flow is directly proportional to the free chlorine concentration.
File Name: Chlorine.pptFeb 2001
Guide to Chlorine Requirements
Application Probable Chlorine Requirement mg/l
Algae Control 3 to 5
Bacterial Slime Prevention 3 to 5
BOD Reduction 10 to 20
Color Removal 5 to 100
Cyanide
Oxidation to Cyanate 2.7 Times Cyanide content as CN
Complete Destruction 6.8 times Cyanide content as CN
Hydrogen Sulf ide
Odor Control 2.1 times H2S content
Oxidation to Sulfate 8.4 times H2S content
Iron Bacteria Control 2 to 10
Iron Precipitation 0.63 times Fe content
Manganese Precipitation 1.3 times Mn content
Sew age
Raw (including odor control) 10 to 30
Primary Sedimentation Effluent 8 to 15
Trickling Filter Eff luent 3 to 10
Activated Sludge Effluent 2 to 8
Sand Filtered Effluent 2 to 5
Septic Tank Effluent 30 to 45
Water
Cooling (once through) 5 to 15 (intermittent)
Cooling (open recirculation) 3 to 5
Chilling 20
Washdow n 50
Disinfectation of Mains and Tanks 10 to 50
File Name: Chlorine.pptFeb 2001
Chorine and Chlorine Dioxide
Free Chlorine Sensors• Model 140
• 0.05 to 20 mg/l (ppm)
• Model 141 Trace• 0.01 to 5 mg/l (ppm)
Chlorine Dioxide Sensors• Model 240
• 0.05 to 20 mg/l (ppm)
• Model 241 Trace• 0.01 to 5 mg/l (ppm)