Hi, just a few questions to ...

Hi, just a few questions to have a more accurate framing of the problem:

1) is the sludge really floating on top of/above the water interface, or is it bulking sludge (most of the water column is occupied by slowly/not settling sludge, but with no sludge on top of the water interface).

2) is there scum/foam formation in the aeration tank?

3) does the influent contains in general substantial amounts of FOG, and was there a substantial higher FOG load during the shock-loading?

4) is it an industrial or communal WWP, and in case of theformer, what is the type of industry connected?

5) what are the normal, average Ntot and COD-concentration values in the influent? 

6) how long is this foam:scum prblem ongoing? 

7) Was there a microscopic sludge examination done on both the settleable fraction, asw ell as on the scum/foam fraction? If so, what were the results?