I hate to see the BOD test ...

Published by

I hate to see the BOD test used for industrial wastewater because the microbes used for BOD testing are completely unacclimated to the organics present.  Obviously there is a lot of COD remaining.  What "micro-organism" was added?  May or may not be appropriate for reseeding.  The high COD remaining may well inhibit nitrifiers and prevent good ammonia removal.  An appropriate reseeding bacterial product to reduce organics followed by nitrifier product may help restore operation.  Foam may well be new biomass growth related.  How long ago did the reseeding occur?  You should probably change your SBR aeration/anoxic schedule to longer aeration until COD drops and nitrate starts to show up in effluent.