CHEMSCAN
  • Applications
    • Municipal Water Monitoring >
      • Ammonia Feed
      • Chloramination Control
      • Chlorination
      • Color Analysis
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      • 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
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    • 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 LowMn (Low 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 PAA (Peracetic Acid)
      • mini Silica
      • mini ChlorAm
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      • ChemScan 2150/S Chloramination Analyzer
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      • ChemScan 2150/NHoP Nutrient Analyzer
      • ChemScan 2150 Process Analyzer
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      • For Wastewater
      • For Water
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UV Disinfection Control

​Statement of the Problem

​
Ultraviolet light is frequently used to disinfect water or wastewater for economic reasons and because chlorine tends to form unwanted and potentially harmful by-products when combined with organics. Chlorine also tends to impart objectionable taste and odor in potable water and may be harmful to aquatic life when discharged in wastewater. Although by-product formation may not be completely eliminated when ultraviolet light is used, by-product formation is substantially reduced, there is no additional taste or odor residual and safety issues related to the handling of chlorine are eliminated.

Ultraviolet disinfection requires a minimum applied dosage to be effective. This applied dosage is a function of the lamp intensity and the exposure time. These parameters are directly affected by equipment configuration, flow path of the water through the bank of lamps, plus the solids content and transmissivity of the water to be disinfected.

Each manufacturer has their own proprietary equipment configuration. Some manufacturers offer UV disinfection systems with lamps configured in a manner which permits fewer lamps to be operated when the water to be disinfected offers less resistance to the transmission of UV light. Changes in turbidity, suspended solids, microbial populations and/or background water chemistry can result in substantial changes in the light transmittance characteristics of water at germicidal wavelengths. Substantial energy savings may be available if acceptable levels of disinfection can be achieved using a reduced number of lamps.

Process Control Issues

Some manufacturers offer an internal device, designed to measure the amount of ultraviolet light being received on the surface of an optical detector. Care should be taken so that changes in the output of the internal light source (due to age or fouling) and fouling of the detector surface can be separated from changes in the transmissive characteristics of the media to be disinfected. Otherwise, false information will be communicated by the internal sensor, which may be measuring conditions other than changes in the media.

Apparatus

ChemScan Process Analyzers can be used to detect the absolute percent transmittance at 254 nm, independent of fouling. A side stream sample of the disinfection influent flows through a cell within the ChemScan Analyzer, where a full spectrum of ultraviolet and visible light is transmitted through a fixed path length of sample. Frequent automatic zeroing and cleaning of the optical surfaces within the flow cell eliminates the effect of fouling on the UV transmittance measurements being made by the ChemScan Analyzer.

​Percent transmittance of light at 254 nm can be continuously measured at frequent intervals. (See ChemScan Method Summary #42, % Transmittance in Treated Wastewater.)

Iron fouling is a significant issue for UV disinfection systems. Dissolved iron is oxidized by UV light and can plate out on the surfaces of the UV lamps, reducing their effectiveness. A full spectrum ChemScan Analyzer can be used to detect dissolved iron and other parameters of interest for process monitoring and control in the influent to the UV disinfection process. These measurements can be used to initiate alarms, adjust upstream aeration processes, or adjust UV dosages.

UV Disinfection Control, Copyright ChemScan, Inc.​

  
ChemScan, Inc.
2325 Parklawn Dr., Suite I, Waukesha, Wisconsin, USA 53186
​Phone: 262-717-9500
Toll Free: 800-665-7133

Contact Us

  • 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 LowMn (Low 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 PAA (Peracetic Acid)
      • mini Silica
      • mini ChlorAm
    • 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 Titrator/ISE Analyzer >
      • For Wastewater
      • For Water
    • ChemScan Analyzer Accessories
    • ChemScan Sensor Family