anaerobic zone

HOW DO I DETERMINE THE RBCODFRACTION• This is done by respirometry to see how much oxygen uptakeoccurred rapidly• However there is a substitute test that is easy to performcalled the flocculated and filtered COD to establish the purelysoluble biodegradable COD fraction. (WERF study 99-WWF-3• Flocculate the feed with chemicals and filter. Do the same with the effluent from a long SRTactivated sludge plant or bench scale unit. The remaining soluble COD will mostly be unbiodegradable.Subtract this from the feed fraction to get the truly soluble biodegradablefraction in the feed, which is a good measure of the rbCOD fraction.10/8/2012