Biological nutrient removal in an MBR treating municipal wastewater with special focus on biological phosphorus removal.
The performance of an MBR pilot plant for biological nutrient removal was evaluated during 210days of operation. The set point values for the internal recycles were determined in advance with the use of an optimisation spreadsheet based on the ASM2d model to optimise the simultaneous removal of C, N and P. The biological nutrient removal (BNR) efficiencies were high from the start of operation with COD and N removal efficiencies of 92+/-6% and 89+/-7, respectively. During the course of the experiment P removal efficiencies increased and finally a P-removal efficiency of 92% was achieved. The activity of poly-phosphate accumulating organisms (PAOs) and denitrifying poly-phosphate accumulating organisms (DPAOs) increased and the specific phosphate accumulation rates after 150days of operation amounted to 13.6mgPg(-1)VSSh(-1) and 5.6mgPg(-1)VSSh(-1), for PAOs and DPAOs, respectively.
Laboratory of Chemical and Environmental Engineering (LEQUiA), Institute of the Environment, University of Girona, E17071 Girona, Spain.
Hector
H
Monclús
Jan
J
Sipma
Giuliana
G
Ferrero
Ignasi
I
Rodriguez-Roda
Joaquim
J
Comas
D019149:Bioreactors; D008567:Membranes, Artificial; D010758:Phosphorus / Q000302:isolation & purification*; D010865:Pilot Projects; D014873:Water Pollutants / Q000302:isolation & purification*
D008567:Membranes, Artificial; D014873:Water Pollutants; D010758:Phosphorus