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Chlorination/De-Chlorination

​​​​​Rev. 5/03

Statement of the Problem

Chlorine is the most widely used disinfectant today, however, the release of chlorinated water into sensitive waterways can be detrimental to aquatic life. Regulations have mandated that the chlorine be removed prior to discharge into a receiving waterway. Most dechlorination processes use a reducing agent such as sodium bisulfite to neutralize the chlorine in the water. A simple treatment process would add excess reducing agent to the stream to insure a complete removal of the chlorine. However, these reducing agents are themselves undesirable. The excess reducing agent will consume dissolved oxygen, potentially affecting the aquatic life. The ideal process would add just enough reducing agent to remove the chlorine.

Process Control Strategy

Dechlorination of chlorinated water requires the detection of chlorine residuals. One strategy is to feed a dechlorinating agent such as sodium bisulfite, sulfur dioxide or other similar compound based on the desired effluent chlorine residual. This is a feed-back type control using the effluent chlorine residual to control the dechlorinating agent feed pump.

Another control strategy is to feed dechlorinating agent use the chlorine residual prior to dechlorinating feed combined with a process flow rate. This is a feed-forward type control strategy. The effluent to the process can be monitored to assure complete removal.

Apparatus

​ChemScan has introduced a special product, the UV-2150/DC for this application. The analyzer can detect chlorine residual at a post disinfection sample point and detect chlorine and dechlorination chemical residuals at concentrations down to 0.01 ppm at post chlorine removal sample point.

Chlorine is detected using a modified idiometric approach with multiple wavelength detection of the iodide to iodine conversion, while dechlorination agent is detected by measuring an applied disinfectant residual compared to a baseline. Unlike other analyzers, the ChemScan system compensates for reagent deterioration by measuring a baseline during every analysis cycle.

Chlorination/De-chlorination, Copyright ASA Analytics
Applied Spectrometry Associates, Inc.
2325 Parklawn Dr., Suite I, Waukesha, WI 53186
​Phone: 262-717-9500
Toll Free: 800-665-7133

Contact Us

  • Home
  • Applications
    • Municipal Water Monitoring >
      • Ammonia Feed
      • Chloramination Control
      • Chlorination
      • Color Analysis
      • Distribution Monitoring
      • Hardness Monitoring
      • Ion Exchange Breakthrough
      • Natural Organic Matter (NOM) Removal
      • Peak Point Chloramination Control
      • Phosphate Sequesterant Feed Control
      • Reservoir Monitoring
      • Security Monitoring
      • TOC Monitoring
      • Well Blending
    • Wastewater Monitoring and Control >
      • Aeration Control and Energy Cost Reduction
      • Biological Nutrient Removal
      • Biological Phosphorus Removal
      • Chemical Phosphorus Removal
      • Chloramination /Breakpoint Avoidance
      • Chlorination/De-Chlorination
      • De-Nitrification Monitoring
      • Nitrification
      • Nutrient Deficiency Analysis
      • Lagoon Discharge
      • SBR Stage Control
      • TOC Monitoring
      • UV Disinfection Control
    • Industrial Water Treatment >
      • Boiler Water Analysis
      • Cooling Water Analysis (Closed Loop)
    • Industrial Process Monitoring >
      • Electroless Plating
    • ASA Technical Papers (ALL)
    • ChemScan Installation Photos
  • Service
    • Contact Service
    • ChemScan Service Team
    • MSDS
    • Communication Protocols
    • Software Utilities
    • Service Videos
  • Parts
  • Company
    • Terms and Conditions
    • Contact Form (General Inquiry)
    • Contact Service
    • Application Data Sheet
    • Employment Opportunities
    • Representatives and Distributors
  • Products
    • ChemScan Mini Analyzer >
      • mini oP (Ortho Phosphate)
      • mini oP (Ortho Phosphate) Extended Range
      • mini LoP (Low Ortho Phosphate)
      • mini UV-254
      • mini LowAm (Low Ammonia)
      • mini Mn (Manganese)
      • mini LowChlor (Low Chlorine)
      • mini Sulfite
      • mini Mono (Monochloramine)
      • mini FreeAm (Free Ammonia)
      • mini Cu (Copper)
      • mini CrVI
      • mini Low CrVI
      • mini Fe (Iron)
      • mini Ni (Nickel)
      • mini Silica
    • ChemScan mini Accessories
    • ChemScan Process Analyzers >
      • ChemScan 2150/S Chloramination Analyzer
      • ChemScan 2150/DC Chem Feed Analyzer
      • ChemScan 2150/N Aeration Rate Analyzer
      • ChemScan 2150/NoP Chem Feed Analyzer
      • ChemScan 2150/NHoP Nutrient Analyzer
      • ChemScan 2150 Process Analyzer
      • ChemScan UV-3150 Process Analyzer
      • ChemScan 4100 Nutrient Control
      • ChemScan 6101 Nutrient Control
    • ChemScan Alkalinity Analyzer >
      • For Wastewater
      • For Water
    • ChemScan Accessories