Long-term study on the impact of temperature on enhanced biological phosphorus and nitrogen removal in membrane bioreactor

摘要: Abstract The study involved experimental observation and performance evaluation of a membrane bioreactor system treating municipal wastewater for nutrient removal period 500 days, emphasizing the impact high temperature on enhanced biological phosphorus (EBPR). MBR was operated at relatively temperatures (24–41 °C). During operational period, total (TP) gradually increased from 50% up to 95% while descended 41 24 °C. At temperatures, anaerobic volatile fatty acid (VFA) uptake occurred with low release implying competition glycogen accumulating organisms (GAOs) polyphosphate (PAOs). Low dissolved oxygen conditions associated did not appreciable affected nitrification but nitrogen removal. Dissolved levels around 1.0 mgO 2 /L in tank provided additional denitrification capacity 6–7 mgN/L by activating simultaneous denitrification. As result, nearly complete could be achieved system, generating permeate no content. gross flux 43 LMH corresponding specific permeability (K) 413 LMH/bar 39 °C tank. factor 43% compared that 25 °C during long-term operation.