FLOW SCHEME:-
Sewage addition may be done at a single point at the inlet end of the tank or it may beat several points along the aeration tank. The sludge return is carried out from the underflow of the settling tank to the aeration tank. The sludge wastage can be done from return sludge line or from aeration tank itself. Sludge wasting from the aeration tank will have a better control over the process, however higher sludge waste volume need to be handled in this case due to lower concentration as compared to when wasting is done from underflow of SST. The compressed air may be applied uniformly along the whole length of the tank or it may be tapered from the head of the aeration tank to its end.
MIXING CONDITIONS
The aeration tank can be of Plug Flow type or Completely Mixed. In the Plug Flow type, the F/M and oxygen demand will be the highest at the inlet end of aeration tank & it will then progressively decrease.
In Completely Mixed system, the F/M & oxygen demand will be uniform throughout the tank.
Sewage addition may be done at a single point at the inlet end of the tank or it may beat several points along the aeration tank. The sludge return is carried out from the underflow of the settling tank to the aeration tank. The sludge wastage can be done from return sludge line or from aeration tank itself. Sludge wasting from the aeration tank will have a better control over the process, however higher sludge waste volume need to be handled in this case due to lower concentration as compared to when wasting is done from underflow of SST. The compressed air may be applied uniformly along the whole length of the tank or it may be tapered from the head of the aeration tank to its end.
MIXING CONDITIONS
The aeration tank can be of Plug Flow type or Completely Mixed. In the Plug Flow type, the F/M and oxygen demand will be the highest at the inlet end of aeration tank & it will then progressively decrease.
In Completely Mixed system, the F/M & oxygen demand will be uniform throughout the tank.
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