Impact of EPA Drinking Water Stage 2 Disinfectant and Disinfectant ...
Impact of EPA Drinking Water Stage 2 Disinfectant and Disinfectant ... Impact of EPA Drinking Water Stage 2 Disinfectant and Disinfectant ...
38Measurement of Disinfectants• Free Residual Chlorine– Red color formation with DPD and buffer– Reaction time of 3 – 5 sec– According ISO 7393-2 / EPA 334.0– Other methods are acceptable (i.e. amperometric principle) aslong as they are calibrated against above mentioned DPDmethod.• Total Chlorine 1– Additional Potassium Iodide (KI) is added to the buffer.– Red color formation with DPD– Reaction time of 3-5 sec• Total Chlorine 2– Red color formation with DPD, buffer and KI– Reaction time of 120 seconds!Disinfection
39Measuring Process1. Zero measurement: Measurement of sample backgroundto compensate for light absorption effects (turbidity, samplecolor) not related to red DPD color2. Free residual chlorine (FRC) measurementSample + Buffer+DPD dosing, immediate reaction3. Total Residual chlorine 1 (TC 1) measurementSample + Buffer+DPD+KI dosing, immediate reaction-> Calculation of monochloramine content4. Total Residual chlorine 2 (TC 2) measurement:Sample + Buffer+DPD+KI plus 2 minutes to completereaction->Calculations:Combined Chlorine contentDisinfection
- Page 1 and 2: 1Impact of EPA Drinking Water Stage
- Page 3 and 4: 3Safe Drinking Water Act of 1974•
- Page 5 and 6: Stage 2 Rule5• The Stage 2 Disinf
- Page 7 and 8: Chemistry of Chlorination7• Free
- Page 9 and 10: 9Chemistry of Chlorination• Free
- Page 11 and 12: 11Chemistry of Chlorine• Atomic N
- Page 13 and 14: 13Chemistry of Chlorination• Duri
- Page 15 and 16: 15History of Monochloramine Use•
- Page 17 and 18: 17Chemistry of ChloraminesThe Basic
- Page 19 and 20: 19Chemistry of Chloramines• The m
- Page 21 and 22: 21CleanWaterDBP: Free Chlorine Trea
- Page 23 and 24: Chloramination Process23• To form
- Page 25 and 26: Chloramination Process25• Chlorin
- Page 27 and 28: 27Chemical AdditionChemicalFeed Rat
- Page 29 and 30: 29Chemical Addition• Goal: 5:1 we
- Page 31 and 32: 31Measurement ChallengesPhotometry,
- Page 33 and 34: 33Desired Analyzer Design FeaturesP
- Page 35 and 36: 35Desired Analyzer Design FeaturesQ
- Page 37: 37Summary of Desired FeaturesA cont
- Page 41 and 42: Monochloramine Monitoring41• Chlo
- Page 43 and 44: Would You Benefit?43• Would you b
- Page 45: 45Questions?Thank you for your atte
39Measuring Process1. Zero measurement: Measurement <strong>of</strong> sample backgroundto compensate for light absorption effects (turbidity, samplecolor) not related to red DPD color2. Free residual chlorine (FRC) measurementSample + Buffer+DPD dosing, immediate reaction3. Total Residual chlorine 1 (TC 1) measurementSample + Buffer+DPD+KI dosing, immediate reaction-> Calculation <strong>of</strong> monochloramine content4. Total Residual chlorine 2 (TC 2) measurement:Sample + Buffer+DPD+KI plus 2 minutes to completereaction->Calculations:Combined Chlorine contentDisinfection
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