Competition between polyphosphate- and glycogen-accumulating organisms in biological phosphorus removal systems - effect of temperature

摘要

This study demonstrated that temperature is an important factor in determining the outcome of competition between polyphosphate-accumulating organisms (PAOs) and glycogen-accumulating non-poly-P organisms (GAOs) and the resultant stability of enhanced biological phosphorus removal (EBPR) systems. At 20degreesC and a 10-day sludge age, PAOs were dominant in the anaerobic/aerobic (A/O) SBR, however, at 30degreesC and a 10-day sludge age, GAOs were dominant in the A/O SBR. For kinetic batch studies, the anaerobic specific acetate uptake rate of GAO-dominated sludge (1.34 x 10(-3) mg C/mg VSS.minute) was higher than the rate of PAO-dominated sludge (0.89 x 10(-3) mg C/mg VSS-minute) at 30degreesC, leading to the eventual failure of EBPR processes at high temperatures. [References: 10]