Hi Chris, a couple of other things you could try tomorrow... I'm not familiar with your exact SBR but often there's a recycle from the DAT to the CAT to provide enough biomass in the CAT. Your comments about different sludges suggest there isn't a recycle on your plant but perhaps it is worth checking in case there is but its not working. In the absence of MLSS measurement, you could try pouring a small amount of mixed liquor from the DAT onto a sheet of paper and sending a photo or short video to me at jeremy.biddle@bluewaterbio.com. I'll try to estimate the MLSS concentration, but it will be rough! You may be able to attach files to forum posts alternatively. From your description of the poor settlement in the DAT, it seems unlikely that it is rat-holing because there's no clear liquid. It may just be that the MLSS is so high and the settlement so poor that a tanker load (or three) has little impact. Hats off to you for having the diligence and persistence to get this sorted. I hope we can get there in the end but it will take some time... Jeremy

Published July 24, 2017 13:53 by Jeremy Biddle, Engineering Director at Bluewater Bio