In these
anaerobic feeding conditions, easy biodegradable organic carbon
will be converted into storage polymers by glycogen (GAO) and
phosphorus (PAO) accumulating organisms in the granule bed. The
uptake of easy biodegradable substrates by PAOs (Fig. 7h) is
accompanied by the release of ortho-phosphate into the bulk liquid
as can be seen from the relative high phosphate peak at the
beginning of the aeration period