TABLE 1.

Sequential batch reactor (SBR) cycling regime used in this study.

Phase	Action	Duration (s)	Description
1	Effluent	100	Evacuation of 1.5 L from the SBR
2	Influent	100	Import of anaerobic digester sludge diluted in RAS water totaling 1.5 L
Anoxic phase
3	N2	60	Establishment of an anoxic environment
Anaerobic phase
4	Still	1,240	Anaerobic fermentation
Aerobic phase
5	Air	600	Aeration of the SBR
6	Still	300	Aeration turned off to keep DO from surpassing 2 mg/L
7	Air	900	Aeration of the SBR
8	Still	900	Shift toward starvation regime to promote P-release in PAOs