Aeration basin DO control

Leeds, United Kingdom (fictional)

CHALLENGE

Fixed blower speeds wasted energy against a widely varying oxygen demand.

SOLUTION

Optical dissolved-oxygen sensors now drive blower speed through smart positioners on the air-distribution valves.

RESULT

Aeration energy reduced and effluent consent margin improved. (Illustrative result.)

INSTRUMENTS USED

Specified for this project

AN-310

Analytical

Luminescence sensing with low drift and no electrolyte.

ACCURACY

±0.1 mg/L

PROTECTION

IP68

CV-310

Control

HART positioner with partial-stroke testing and valve diagnostics.

ACCURACY

Resolution 0.1 %

PROTECTION

IP66

APPLICATIONS

APPLICATION

Aeration is the largest energy cost in treatment; DO control cuts it.

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