Enhanced synergistic denitrification and chemical precipitation in a modified BAF process by using Fe2+.
A series of laboratory-scale experiments for examining the feasibility and suitability of using Fe(2+) as the precipitant dosed in the pre-denitrification stage of a modified BAF process employing simultaneous chemical precipitation of TSS and phosphorus were carried out. The effects of dosing Fe(2+) on effluent quality and sludge characteristics of the pre-denitrification stage were assessed with comparing to the cases of no additional chemical dosing and dosing Fe(3+). Results obtained demonstrated a sound performance of synergistic denitrification and chemical precipitation in pre-denitrification of the modified BAF process when dosing Fe salts, which showed enhanced by using Fe(2+) as the dosed precipitant in increasing the denitrification loading rate, exhibiting a better controlling of the residual phosphorus in pre-denitrification effluent, and improving sludge settleability. Dosing Fe salt showed no adverse impact in removing COD, but resulted in a relatively higher SS content in the pre-denitrification effluent.
Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055, PR China; Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Shenzhen 518055, China.
Hongjie
H
Wang
Wengyi
W
Dong
Ting
T
Li
Tongzhou
T
Liu
D000332:Aerobiosis / Q000187:drug effects; D000468:Alkalies / Q000737:chemistry; D001673:Biodegradation, Environmental / Q000187:drug effects; D057919:Biological Oxygen Demand Analysis; D011232:Chemical Precipitation / Q000187:drug effects*; D058440:Denitrification / Q000187:drug effects*; D005374:Filtration / Q000295:instrumentation* / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000494:pharmacology*; D010758:Phosphorus / Q000302:isolation & purification; D014835:Volatilization; D014865:Waste Disposal, Fluid
D000468:Alkalies; D010758:Phosphorus; D007501:Iron
BAF; Ferrous iron; Residue phosphorus control; Sludge settleability; Synergistic denitrification and chemical precipitation