C) Aeration Tank - YOKOGAWA ZR22G Technical Information

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c) Aeration tank

In one type of sludge processing, oxygen gas is introduced into the processing tanks to maintain
the dissolved oxygen concentration in the sludge liquid at a proper level. Efficiency is checked by
measuring the oxygen concentration in the exhaust gas from the processing tank.
Control Valve
Oxygen
Waste Water
Returned
Sludge
All Rights Reserved. Copyright © 2004, Yokogawa Electric Corporation
Sample point
Exhaust line
Activated Sludge Processing Facility
(Surface Aeration System Aeration Tank)
Aeration tank
Temperature: Normal temperature
Pressure: 0 to 1 kPa
Concentration: Approximately 50% O
System type
L2, L3
Gas Recycle Compressor
Agitator
4. Applications
Detector
Efficiency monitoring & alarm
D1
(0 to 100% range)
2
TI 11M12A01-01E
4-17
Objective
T0417.EPS
Exhaust
Mixed
Liquids
F0417.EPS
May 31, 2004-00