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Ion Selective Electrodes for Easy and Cost Effective Online Monitoring of Ammonium and Nitrate in Waste Water

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Despite converse opinions WTW was able to launch a probe based on ion selective electrodes (ISE) in 2002 successfully, which could continuously measure ammonium in waste water treatment plants (WWTP). The latest probe type VARiONplus is able to measure ammonium and nitrate in parallel and can compensate or eliminate the influence of interfering ions like potassium or chloride. There is no need for sample preparation and calibration. Only few maintenance is necessary. The lifetime of the electrodes could be extended to up to two years. With this instrumentation energy savings of up to 30% in the nitrification/denitrification process of WWTPs are possible, i.e. costs for the electricity to run the blowers.

Document Type: Research Article


Publication date: 2008-01-01

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