Metrohm process analysers provide phosphorus analysis in wastewater
6 Mar 2017
Metrohm Process Analytics’ 2035 process analyser is designed as an integrated solution for 24/7 online-monitoring of critical chemical parameters such as ortho- and total phosphate phosphorus in wastewater streams.
Phosphorus removal is essential in wastewater treatment plants to ensure the environment is not harmed by discharged effluent.
In the treatment facility it is important to know the o-PO4-P concentration in the influent stream to accurately determine the amount of reagents needed for chemical treatment. For regulation compliance purposes, treated effluent is monitored for TP – the sum of all insoluble and dissolved phosphates present.
The 2035 process analyser utilises a compact digestion cuvette photometer module to monitor both o-PO4-P and TP online according to DIN EN ISO 6878:2004-09.
It is configured to digest and oxidise wastewater samples in order to free orthophosphates from organics. Further reagents are added after the digestion step. Phosphomolybdic acid is formed then reduced, which enables a colourimetric determination of the intensely blue-coloured complex.
The analyser can measure phosphorus concentrations online via colourimetric detection in three ranges: Low TP: 0–150 μg/L PO4-P; Standard TP: 0–5 mg/L PO4-P; or High TP: 0–100 mg/L PO4-P.
Analysis can be combined with additional measuring techniques such as pH and/or conductivity measurement, offering a more complete snapshot of the treatment process.
Strict separation of wet part and electronics ensures safe operation in harsh environments, says the company. The electronics part is housed within non-corrosive epoxy-coated stainless steel. The new system is entirely modular in design, enabling custom configurations for monitoring single or multiple process streams.