[Effect of Temperature on PAO Activity and Substrate Competition].

To investigate the effect of temperature on the activity of high-temperature phosphate accumulating organisms (PAO) and their competitive ability for the substrate, the sludge from an enhanced biological phosphorus removal (EBPR) reactor stably operated at the high temperature of 30℃ was used. The results showed that PAO activity and their competitive ability for the substrate increased with temperature increasing from 15℃ to 30℃. When the temperature was as higher as 30℃, the rates of anaerobic phosphorus release, aerobic phosphorus uptake and acetate uptake of PAO were 239.46 mg·(g·h), 79.90 mg·(g·h), 357.47 mg·(g·h), respectively. The corresponding value of ΔP/ΔHAc was 0.628, which was considerably higher than that of PAO reported in literatures. A simplified Arrhenius equation was used to describe the effect of temperature on the rates of anaerobic phosphorus release, aerobic phosphorus uptake and acetate uptake, and the temperature coefficients were 1.08, 1.07 and 1.05, respectively.