BOD - Bio-chemical Oxygen ...

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BOD - Bio-chemical Oxygen demand, oxygen demand created by biological source

COD - Oxygen demand created by chemical source

Kindly check the exchange of air inside the aeration tank, air diffusion from grid or diffuser to be check. 

Trouble Shooting protocol:

In operation, activate working blower and stand by blower at same time for retention time. If BOD and COD obtained, air diffusion system to be cross check.