CHEMSCAN
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De-Nitrification Monitoring

​​​​​​Statement of the Problem

Denitrification is a term applied to a biological wastewater treatment process used to convert nitrate (NO3) into nitrogen gas. The process employs a special class of bacteria that metabolize carbon and oxygen. Under anoxic (low/no oxygen) conditions in nitrified wastewater, these bacteria are forced to strip an atom of needed oxygen from a nitrate or nitrite molecule. Carbon is typically obtained by the bacteria from a carbon source such as methanol which is added to the treatment process as a food source. The availability of nitrate and methanol are therefore the limiting factors that sustain a given population of denitrifiers. Underfeed of methanol will limit the reduction of nitrate in the process, while overfeed of methanol will result in a higher BOD value in the final effluent. The ideal is a methanol feed rate which is sufficient to obtain a desired amount of nitrogen removal given an overall process demand, which is a function of nitrate concentration and wastewater flow rate variables for a given set of process conditions.

Process Control Strategy

Methanol feed can be controlled through the use of on-line analysis of nitrate concentration before and after the denitrification process, as shown in Figure 1. Prior to the process, nitrate concentration can be monitored and combined with flow and other factors to produce a calculation of methanol feed for the process. A measurement of nitrate concentration after the process can be used to trim the methanol feed setting.

Apparatus
On-line analysis of nitrate can be performed at frequent intervals from multiple sample points using a ChemScan Process Analyzer. The ChemScan system measures light absorbance at numerous wavelengths in the ultraviolet and visible wavelength range. This information is used to calculate the concentration of nitrate in the sample while compensating for the presence of background chemicals and turbidity variations.

​If desired, ChemScan can also detect nitrite, which is an intermediate step in the denitrification process, as another indicator of process efficiency. Detection of total oxidized nitrogen (nitrate plus nitrite) is also possible.

De-Nitrification Monitoring, Copyright ChemScan, Inc.​
ChemScan, Inc.
2325 Parklawn Dr., Suite I, Waukesha, Wisconsin, USA 53186
​Phone: 262-717-9500
Toll Free: 800-665-7133
  • Applications
    • Municipal Water Monitoring >
      • Ammonia Feed
      • Chloramination Control
      • Chlorination
      • Color Analysis
      • Distribution Monitoring
      • Ion Exchange Breakthrough
      • Natural Organic Matter (NOM) Removal
      • Peak Point Chloramination Control
      • Phosphate Sequesterant Feed Control
      • Reservoir Monitoring
      • Security Monitoring
      • TOC Monitoring in Water
      • 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
    • Success Stories
    • ChemScan Webinars
  • Service
    • Contact Service Request Form
    • 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
    • ChemScan Representatives and Distributors
  • Products
    • ChemScan Mini Analyzer >
      • mini oP (Ortho Phosphate)
      • mini oP (Ortho Phosphate) Extended Range
      • mini Cu (Copper)
      • 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 Ammonia
      • mini FreeAm (Free Ammonia)
      • mini Fe (Iron)
      • mini Ni (Nickel)
      • mini PAA (Peracetic Acid)
      • 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 Process Analyzers with HMI >
      • ChemScan 2250/S HMI Chloramination Analyzer
      • ChemScan 4200 HMI Analyzer
      • ChemScan 3250 HMI Analyzer
      • ChemScan 2250/NoP HMI Analyzer
      • ChemScan 2250/NHoP HMI Analyzer
      • ChemScan 2250/N HMI Analyzer
      • ChemScan 2250 HMI Analyzer
      • ChemScan 6201 HMI Analyzer
    • ChemScan Analyzer Accessories
    • ChemScan Sensor Family