Introduction
The detectors used to perform dissolved oxygen (DO) measurement in oxidation ditch type sewage treatment plants tend to become dirty quickly and require frequent cleaning. It has been d ifficult to remedy this problem inexpensively. One solution that significantly reduces the sensor maintenance workload is the use of float holders. A field test using float holders on the detectors in the DO402 dissolved oxygen analyzer system has demonstr ated that the sensors could be kept free of heavy dirt accumulation, eliminating the need for maintenance and enabling continuous measurement for long periods of time.
Application
An oxidation ditch is a large circular basin equipped with aerators that i s used to remove organic matter and pollutants from sewage through the processes of adsorption, oxidation, and decomposition.
- Ensures stable, continuous dissolved oxygen measurement
- Reduces operating costs
- Eliminates the need for manual cleaning
Product Recommendations
Detector: DO30
Float holders: FD30, PB30
Converter: DO202, DO402
Field Data
For the field test, two detectors were mounted in PB350G angled float holders. One sensor received no maint enance and the other was cleaned every two weeks and calibrated once a month. This test showed that the readings from the two sensors were nearly identical over a six month period.
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Notes:
- For more information contact your local Yokogawa Analytical Marketing Department.
Industries
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Water & Wastewater
Water resources are finite, and therefore contributing to a sustainable water cycle is one of the Sustainable Development Goals (SDGs). Yokogawa has been providing advanced digital control solutions for the stable supply of clean and safe water, wastewater treatment for protecting the water environment, water loss management and optimization of plant operation for reducing CO2 emissions and running costs. With our leading-edge technologies, dependable products and extensive expertise and experience of diverse water projects around the world, we work with you to provide sustainable water solutions that boost your business and add value throughout the plant lifecycle.
Yokogawa supports a wide range of water control applications in both the municipal and industrial water markets.
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