Simultaneous nitrification-denitrification and phosphorus removal in a fixed bed sequencing batch reactor (FBSBR).
Biological nutrient removal (BNR) was investigated in a fixed bed sequencing batch reactor (FBSBR) in which instead of activated sludge polypropylene carriers were used. The FBSBR performance on carbon and nitrogen removal at different loading rates was significant. COD, TN, and phosphorus removal efficiencies were at range of 90-96%, 60-88%, and 76-90% respectively while these values at SBR reactor were 85-95%, 38-60%, and 20-79% respectively. These results show that the simultaneous nitrification-denitrification (SND) is significantly higher than conventional SBR reactor. The higher total phosphorus (TP) removal in FBSBR correlates with oxygen gradient in biofilm layer. The influence of fixed media on biomass production yield was assessed by monitoring the MLSS concentrations versus COD removal for both reactors and results revealed that the sludge production yield (Y(obs)) is significantly less in FBSBR reactors compared with SBR reactor. The FBSBR was more efficient in SND and phosphorus removal. Moreover, it produced less excess sludge but higher in nutrient content and stabilization ratio (less VSS/TSS ratio).
Department of Civil & Environmental Engineering, Graduate Faculty of Environment, University of Tehran, No 25 Qods St, Enghelab Ave, Tehran, Iran. you.rahimi@gmail.com
Yousef
Y
Rahimi
Ali
A
Torabian
Naser
N
Mehrdadi
Behzad
B
Shahmoradi
D018441:Biofilms; D058465:Nitrification; D010758:Phosphorus / Q000302:isolation & purification*; D012722:Sewage
D012722:Sewage; D010758:Phosphorus