Dissolved oxygen control in photosynthetic-oxygen supported algal-bacterial granule
Algal-bacterial granule (ABG) process is a promising biotechnology for carbon emission reduction, especially for photosynthetic O2-supported ABG (POS-ABG) systems without mechanical aeration. However, the roles of dissolved oxygen (DO) generated by coexisting algae remain unclear in this POS-ABG system. This study aimed to explore the effects of different DO control levels (0.5-1.0, 1.0-1.5, 2.0-2.5 mg/L) on POS-ABG system performance, in which DO levels were automatically controlled via a feedback control unit between DO concentration and light duration.