Oxidation Ditch Type Treatment Process


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.


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

oxidation-ditch-product-recommendationsDetector: 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.

difference-of-readings comparison-of-readings-in-continuous-operation


  • For more information contact your local Yokogawa Analytical Marketing Department.


Related Products & Solutions

2-Wire Transmitter/Analyzer FLXA202/21

The FLEXA™ series analyzers are used for continuous on-line measurements in industrial installations. With an option for single or dual sensor measurement, they are the most flexible two-wire analyzer available.

4-Wire Analyzer DO402G

Flexibility, reliability and low maintenance are among the benefits provided by the EXA DO402G dissolved oxygen converter.

Measuring Sensor DO30G

The DO30G sensor for dissolved oxygen is designed for use in water treatment plants such as sewage treatment works, effluent activated sludge process, and potable water treatment. It is also effective in river monitoring, intake protection, fish farming, and other fields where water quality is important.

pH and ORP Analyzers

pH and ORP meters, analyzers and transmitters are used for continuous process monitoring of pH and ORP to ensure water/product quality, monitor effluent discharge, batch neutralization, pulp stock, scrubbers, cooling towers, chemical, water/wastewater treatment and many other applications.


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