Automated pH measuring point in wastewater
More safety and less effort in heavy-duty applications
The Dow plant in Stade relies on Endress+Hauser solutions for pH monitoring in the treatment of production wastewater. These are used for continuous pH measurement and automated cleaning and calibration of the sensors. In this way, Dow ensures reliable measured values and a safe process.
Main components in the cabinet: CDC90 control unit, pneumatic control unit and canisters for cleaning agent and pH buffer solutions
Ideal for heavy-duty applications: The retractable pH assembly CPA473
Results
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High reliability of the pHmeasured pH values due to consistent measuring conditions and optimized cleaning and calibration cycles
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Automatic transfer of sensor calibration data thanks to Memosens technology
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Automated status monitoring of the sensors and fault message directly to the control system when limit values are exceeded
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Minimized maintenance and servicing
Together with Endress+Hauser, we tailored the CDC90 automation solution to our needs. The systems run reliably and satisfactorily all around.
Maintenance, Dow plant in Stade
The challenge
Well-monitored wastewater treatment is required when various wastewaters flow together in the BIOX plant at Dow. The wastewater passes through a neutralization and a settling basin, buffer tanks, high-tower biology and the flotation basin. Individual process steps and the dosing of chemicals are monitored and controlled by continuously measured pH values. Regular cleaning, calibration and condition monitoring of the sensors are essential for this, and the manual effort involved is significant.
Endress+Hauser supplied several Liquiline Control CDC90 for different process steps: The measuring system automatically cleans, calibrates, monitors and verifies the connected pH sensors. The system at Dow is particularly suitable for heavy-duty applications and the use of aggressive cleaners such as concentrated acids and alkalis. If condition values of the pH sensor are outside a specified range, a fault message is automatically triggered in the process control system.
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