Oxidation Ditch Type Treatment Process

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

oxidation-ditch

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

Notes:

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

Industries

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