Can increased oxygenation break down more COD in a WWTP? 1

[munich]

We treat effluent of a fast food restaurant in an activated sludge treatment plant. Our effluent is quite turbid, TSS levels around 50 mg/L and COD levels of the effluent are around 300 - 500 mg/L. COD inflow is around 1,500 mg/L.
BOD5 levels are very low, around 1-3 mg/L. MLSS is about 200 ml/L.

We use Venturi aeration and as BOD levels show this system is quite fine. However due to excessive use of detergents and disinfectants in the restaurant we believe that non-biodegradable matter increases the effluent COD. Hydrolyzed oil/grease might contribute as well.
Question: will doubling of the oxygen intake by addition of one Venturi aerator help to reduce effluent COD?

 

[rbcoulter]

You seem to imply that you want to decrease the non-biodegradable COD level by increasing aeration (more oxygen). If it is non-biodegradable how is that going to help? If is is biodegradable it is simply a matter if your system has the capacity to handle it. If you want to maintain your existing outlet BOD concentration then the MLSS will need to increase to correspond to your additional BOD influent load.
The O2 supply may or may not be the limiting factor here.
Measure the dissolved oxygen in the treatment unit to determine if you need additional aeration.

 

[munich]

rbcoulter:
thanks for your post, I will go there, MLSS increase makes sense a lot.
Cheers
munich