world map

World’s Leading supplier in Precision Dissolved Oxygen Measurement and Respirometry

email us at


call us on

icn-phone +44 (0)1698 730400


Strathkelvin Instruments/Wastewater Respirometry

Wastewater Respirometry

Our expertise is in the field of Activated Sludge Bacteria, that are used to treat wastewaters.

Our range of Instruments measure Activated Sludge bacterial performance, reducing aeration energy costs, managing toxicity/improving compliance and significantly improving process data and visibility.  Strathkelvin have been making high quality instrumentation in the field of Respirometry since 1981, and our equipment has established an enviable reputation for quality, robustness and ease of use.

ASP-Con (Activated Sludge Plant Controller) is a Self-Cleaning, Self-Calibrating Multi-Parameter instrument, used in the online analysis of Activated Sludge Plants.   Click on our ASP-Con page to look at the amazing features and capabilities.

Strathtox is a fully integrated Laboratory Respirometer. Testing protocols are quick and simple, and tests are routinely completed in under 9 minutes. It’s Easy-to-use software provides automated results and graphs, allowing a wide range of personnel to make effective use of Strathtox. Click and check out how easy it is to run a Respiration Inhibition (RI) Test.

AS Bioscope is a portable instrument that measures the respiration rate of bacteria in the plant under the prevailing load and environmental conditions. This provides operators with a real insight into the operation of their wastewater treatment plant – as easy as grabbing a sample of influent.

Clients such as Water Companies, Consulting Engineers, Industrial Waste Generators, Utility Operators and Academic Establishments have purchased our instruments for a wide range of applications including:

  • Toxicity Management – Learn in under 9 minutes if an influent is toxic to your Treatment Works.
  • Aeration Optimisation – Gain a better understanding of your plant’s aeration requirements – saving energy and solving treatment issues.
  • Nitrification Management – Are your plant conditions correct to encourage or discourage nitrification?
  • Consultancy – Find quickly what is working and not working for your/your customers treatment plant, running simple on the spot tests.
  • Plant Efficiency – Improve treatment by getting the correct data in good time/Real Time.
  • Pilot plant monitoring – Check out incoming influents to ensure your plant is set up to treat efficiently and protect from toxic shock conditions.
  • Tankered waste testing – Check out if your plant can easily treat incoming tankered waste in under 9 minutes!
  • Feed programme optimisation – Check out your plant health – investigate your options will work prior to adding them to your treatment works.
  • Audit and conformance management – Check your plant is compliant and efficient.

Strathtox (™) is a highly flexible and robust Respirometer used for the measurement of:

  • Respiration inhibition (toxicity of influents to activated sludge)
  • Nitrification inhibition
  • Aeration efficiency
  • Sludge health monitoring
  • Critical Oxygen Point Analysis
  • Short-term BOD
  • Process optimisation testing including Nutrient optimisation and Aeration set point optimisation
  • BOD and Nitrification capacity testing

AS Bioscope is a robust portable respirometer for in-plant basin bacterial analysis and is used for:

  • Comparative analysis of bacterial respiration at single or multiple points over a number of plants
  • DO and temperature measurements
  • SVI or SSVI settlement characterisation

Working in combination these two instruments allow Plant Operators to gain the operational and financial benefits of achieving full control over their wastewater treatment operation. Many of our customers have been able to recover their investment in record time.

Print Friendly

quick quote icon

  quick enquiry

Please leave this field empty.

blue bird

Strathkelvin Instruments Limited,

Rowantree Avenue,

North Lanarkshire, ML1 5RX,


01698 730400
Fax: 01698 730401
    • visa
    • visa-electron
    • maestro
    • delta
    • m-card
    •   paypal