“…The concentration of polymer accumulation depends upon the amount of rbCOD (Vollertsen et al, 2006) and consequently, the P release also decreased over time. Similar correlation between rbCOD and Prelease has been reported previously (Martinez et al, 2001). Both systems achieved good phosphorus removal as evident from the COD/P ratio of 100, which agrees with other reports (Lee et al, 1997) and the low COD/P ratio may positively affect the overall phosphorus removal efficiency.…”