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COMPETITION BETWEEN POLYPHOSPHATE- AND GLYCOGEN-ACCUMULATING ORGANISMS IN ENHANCED BIOLOGICAL PHOSPHORUS REMOVAL SYSTEMS—EFFECT OF TEMPERATURE AND SLUDGE AGE

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This study has demonstrated that temperature and sludge age are important factors 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). At 20°C and 10-day sludge age, PAOs were dominant in an anaerobic/aerobic (A/O) sequencing batch reactor (SBR) due to the advantage of anaerobic acetate uptake rate and aerobic biomass yield; however, at 30°C and 10-day sludge age, GAOs were able to out-compete PAOs in the A/O SBR due to the advantage of anaerobic acetate uptake. At 30°C and 5-day sludge age, PAOs and GAOs coexisted in the A/O SBR, resulting in unstable EBPR performance. After reducing the sludge age from 5 to 3 days, the EBPR efficiency improved drastically, and the EBPR performance was stable. The specific anaerobic acetate uptake rates of GAO-enriched activated sludge were significantly affected by temperature with the Arrhenius temperature coefficient  of 0.047 (°C−1) between 10 and 30°C. The effect of sludge age (5 and 10 days) on the specific anaerobic acetate uptake rates of GAO-enriched activated sludge, however, was not significant. For the PAO-enriched activated sludge, the specific anaerobic acetate uptake rate did not change significantly between 20 and 30°C but increased as sludge age decreased from 10 to 3 days.
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Document Type: Research Article

Publication date: 2001-01-01

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