ABSTRACT
27P-removing sludge was enriched in an anaerobic-aerobic, acetate fed, sequencing batch reactor (SBR) at 20 °C. Conversion of relevant compounds for biological phosphorus removal was studied at 5,10,20 and 30 ° C in separate batch tests (short-term temperature effects). The stoichiometry of the anaerobic processes was insensitive to temperature changes. Some effect on aerobic stoichiometry was observed. In contrast, temperature had a strong influence on the kinetics of the processes under anaerobic as well as aerobic conditions. The anaerobic P-release (or acetate-uptake) rate showed a maximum at 20°C. However, a continuous increase was observed in the interval 5-30°C for the conversion rates under aerobic conditions. Based on these experiments, temperature coefficients for the different reactions were calculated. An overall anaerobic and aerobic temperature coefficient 6 was found to be 1.078 and 1.057 (valid in the ranges 5°C≤T≤20°C and 5°C≤T≤30°C), respectively.
