Influence of temperature, pH and dissolved oxygen concentration on enhanced biological phosphorus removal under strictly aerobic conditions.

摘要: Previous research has suggested that enhanced biological phosphorus removal (EBPR) from wastewater can be achieved under continuous aerobic conditions over the short term. However, little is known how environmental might affect EBPR performance. Consequently we have investigated impact of temperature, pH and dissolved oxygen (DO) concentrations on performance strictly conditions. A sequencing batch reactor (SBR) was operated for 108 days a six-hour cycle (four cycles day). The SBR ran alternating anaerobic-aerobic as standard then one every three or four days. operational temperature (10, 15, 20, 25 30°C), (6, 7, 8 9) DO concentration (0.5, 2.0 3.5mg/L) were changed consecutively during cycle. Recorded increases in mixed liquor (P) carbon source uptake (P release) affected by biomass P content rather than imposed changes Thus, release levels increased with content. By contrast, subsequent assimilation uptake) both pH, peaked at 20-25°C 7-8. Highest detected these operating 15.4 mg Pg-MLSS(-1) (at 25°C, 7 2.0mg/L). ability community linked required presence acetate medium, finding which differs previous data, where are reported to occur absence any exogenous source. Fluorescence situ hybridization performed samples collected SBR, Candidatus 'Accumulibacter phosphatis' cells PAOmix probes through periods. seemed perform shown studies