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AlpHa Measurement Solutions |
Dissolved Oxygen (DO) in Wastewater Treatment

DO in Wastewater Treatment

Municipal and industrial wastewater facilities monitor dissolved oxygen (DO) concentrations to ensure the treatment process is operating properly which includes the health and performance of the wastewater biology and efficient use of treatment chemicals and energy. Continuously monitoring DO ensures optimal oxygenation in activated sludge and biological nutrient removal (BNR) processes without inefficiently over aerating. Facilities are required to pretreat their outgoing wastewater and submit biological oxygen demand (BOD) data on a regular basis to meet regulatory or compliance requirements. AlpHa has sensor solutions uniquely tailored to each application, including continuous (process) monitoring sensors, DO and BOD laboratory electrodes, and handheld DO meter solutions.

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Optical

  • Range:
    • 0 – 20ppm (0 – 200% saturation)
    • 0 – 50ppm (0 – 500% saturation)
    • Adjustable within 0 – 50ppm
  • Response Time: T90 < ~35 seconds
  • Accuracy:
    • Dissolved Oxygen
      • 0 to 10 mg/L (±1%)
      • 10 to 20 mg/L (±2%)
      • 20 to 30 mg/L (±5%)
      • 30 to 50 mg/L (±15%)
    • Temperature: ±0.2°C
    • Pressure: ±0.2 kPa
  • Temperature Range: 0 to 50°C
  • Pressure: 
    • Operating Atmospheric Pressure: 40 to 115 kPa
    • Maximum Bearing Pressure: 700 kPa
  • Warranty: 6 to 24 Months Depending on Solution
  • AP Series
    • AP formulation is a highly stable sensor coating with zero drift. Designed for monitoring oxygen partial pressure in gas and dissolved oxygen concentration in liquids for biological environments. AP sensors are compatible with acidic as well as highly caustic environments. Overcoat options exist based on application.
  • HCR Series
    • HCR is a hydrocarbon-compatible formulation designed to monitor oxygen partial pressure in hydrocarbons such as fuels, organic solvents, oils, and alcohols. Overcoat options exist based on application.

 AP SeriesHCR Series
Response RateNo Overcoat: T90 ~1 secNo Overcoat: T90 ~1 sec
 White Overcoat: T90 ~1 minBlack Overcoat: T90 ~1 min
 Black Overcoat: T90 ~1 min 
Dynamic Range in Gas0 – 100% O2 / 0 – 760 mmHg O20 – 100% O2 / 0 – 760 mmHg O2
Dynamic Range in Water (DO)0 – 40 ppm (wt)0 – 40 ppm (wt)
Dynamic Range in Other Liquids0 to Oxygen Saturation Level0 to Oxygen Saturation Level
Resolution in Gas0.005% O2 / 0.04 mmHg0.05% O2 / 0.4 mmHg
Resolution in Water (DO)0.002 ppm (wt) / 2.0 ppb (wt)0.02 ppm (wt) / 20 ppb (wt)
Resolution in Other Liquids0.005% of Oxygen Saturation Level0.05% of Oxygen Saturation Level
Accuracy5% of Reading5% of Reading
Lowest Detectable Level (gas)0.005% O2 / 0.04 mmHg0.05% O2 / 0.4 mmHg
Lowest Detectable Level (water)0.002 ppm (wt) / 2.0 ppb (wt)0.1 ppm (wt) / 100 ppb (wt)
Lowest Detectable Level in Other Liquids0.005% of Oxygen Saturation Level0.25% of Oxygen Saturation Level
Sensor Drift0.002 O2% per Day0.001 O2% per Hour
Operating Temperature-50 to 80°C-50 to 120°C
Recommended Patch Replacement1 Year1 Year
  • Optical DO Solutions
    • DOPO2 Fiber Sensor
      • Fiber optic sensor for use with remote patches and the electro-optical module
    • Optical DO Sensor
      • Complete with Integrated Sensor Cap
      • Lumiphore Coating on Sensor Cap
      • Coating Options Available
    • BOD / CBOD Ready Optical DO
    • Patches
      • AP Series: Water samples, gas samples, and various matrices designed for biological applications
      • HCR Series: Hydrocarbon compatible applications (examples such as aviation fuels, gasoline, kerosene, toluene, acetone, UV curable ink, divinylbenzene (DVB), methyl methacrylate (MMA))
  • Form Factor
    • 12 mm
    • Process Body
    • Plastic Fiber Probe
    • Needle Probe
    • Dip Probe with Embedded Thermistor
    • Sensor Patch
    • Non-invasive Patch + Reflective Optical DO 
    • Cartridge 
    • Custom Options Available
  • Housing Material Options
    • Ryton® (PPS)
    • Kynar® (PVDF)
    • ABS
    • Polyethylene
    • PEEK
    • Semi-Disposable Plastic 
    • PVC / CPVC
    • Metal
      • Stainless Steel 
      • Other Metals Available 
  • Thermistor Options
    • 30 kohm 
    • Any commercially available thermistors and custom options
    • Common temperature accuracy is ±0.3°C and can vary based on thermistor option chosen
  • Integrated Insertions 
    • 3/4" NPT
    • 1" NPT
    • 1/2" NPT
    • BOD Bottle Adapter
    • Custom Options Available
  • Analog
    • 4 20 mA
    • 0 5 V
    • Custom Options Available
  • Digital
    • RS-485 MODBUS RTU
    • Custom Options Available 
  • Connectors with Cables
    • DIN
    • Tinned Leads
    • SMA (fiber optic probes)
    • Circular Connectors
    • LEMO
    • BNC
    • Spade Lugs
    • MOLEX
    • Mil-spec
    • 2.5 mm / 3.5 mm phono
    • RCA
    • Any commercially available connectors and custom options

Electrochemical

  • Range:
    • 0 – 20 mg/L  (0 – 200% saturation)
    • 0 – 50 mg/L  (0 – 500% saturation) 
  • Response Time: T90 < 35 Seconds 
  • Accuracy: ±2%
  • Temperature Range: 
    • 0 – 50°C Continuously Monitored
    • 0 – 80°C Grab Sample
  • Warranty: 12 Months
  • Technology
    • Polarographic
      • Platinum Cathode / Silver Anode, Teflon Membrane
    • Galvanic
      • Platinum Cathode / Lead Anode, Teflon Membrane
      • Silver Cathode / Zinc Anode, Teflon Membrane
  • Form Factor 
    • Process Body
    • 12 mm
    • Cartridge
    • Custom Options Available
  • Housing Material Options
    • ABS
    • Epoxy
    • Ryton® (PPS)
    • Polycarbonate
    • PVC / CPVC
    • Custom Options Available 
  • Thermistor Options
    • PT100 (type A & B)
    • PT1000
    • 10 kohm
    • 30 kohm
    • 100 kohm
    • Any commercially available thermistors and custom options
    • Common temperature accuracy is ±0.3°C and can vary based on thermistor option chosen
  • Integrated Insertions 
    • 3/4" NPT
    • 1/2" NPT
    • 1" NPT
    • PG 13.5
    • Custom Options Available
  • Analog
    • Nanoamperes (nA)
    • Millivolts (mV)
    • Custom Options Available
  • Connectors & Cables
    • Integrated Connectors (detachable or cableless)
      • Variopin
      • S7
      • S8
      • BNC 
      • Custom Options Available 
    • Connectors with Cables (including temperature)
      • DIN
      • Circular Connectors
      • LEMO
      • Tinned Leads
      • Mil-spec
      • BNC
      • SMA
      • Spade Lugs
      • MOLEX
      • 2.5 mm / 3.5 mm phono
      • RCA
      • Any commercially available connectors and custom options