This was
achieved by efficient suspension of the ABC throughout the water body maintaining optimum pH and dissolved
oxygen that led to rapid COD removal and improved algal biomass production. The suspension of
the ABC using the co-polymer PAPA maintained a DO of 8–10 mg l1 compared to 2–3 mg l1 when not
suspended. As a result, the non-suspended ABC only achieved a 50% reduction in COD after 96 h compared
to a 89% COD removal using 80 ppm PAPA suspension. In addition, the algae biomass increased
from 0.4 g l1 d1 for the non-suspended ABC to 1.1 g l1 d1 when suspended using 80 ppm PAPA.
201