Fig. 2. (A) Changes in dissolved oxygen (DO) during the start-up period of sequencing batch reactors with glucose added (a) and that of sequencing batch reactors for the
control group (b). (B) Changes in the flocs volume index (flocs volume index)-5 during the start-up period of sequencing batch reactors with glucose added (a) and that of
sequencing batch reactors for the control group (b).