Enhanced combined assimilative and bound phosphorus uptake in concurrence with nitrate removal in pre-anoxic cyclic sequencing batch reactor

Needless to specify, controlling nitrogen and phosphorus discharge from wastewater treatment plants is synonymous with the prevention of eutrophication surface waters, as one major issues related water security. The present study investigates performance a pre-anoxic sequencing batch reactor (SBR) working on basis intermittent aeration, operated at varied carbon (bCOD) (C/N) ratio 3, 7.5, 10, readily biodegradable (rbCOD) slowly (sbCOD) 0.1, 0.25, 0.5. findings revealed that an enhanced removal was observed, together higher C/N rbCOD sbCOD ratios. results also show consistent increase in total removal. uptake sludge 0.02 – 0.045 mgP/mgVSS (avg. 0.031 ± 0.004), which resulted enrichment levels 0.88 1.68 times stoichiometric value 0.0267 1.45 0.14). On average basis, assimilative phosphate (TP) content increased by 0.008 gTP/gNO 3− -N rate. excess due formation poorly soluble polyvalent compounds, found based dry analysis, persisted bound sludge.