N and P removal can be improved simultaneously in a single stormwater biofilter.
Iron-rich soil greatly promoted adsorption of ammonium and phosphate.
Massive P adsorbed by iron-rich soil fueled nitrifiers & denitrifiers.
Different types of plant detritus had various impacts on nitrifiers & denitrifiers.
Bioaugmentation of nitrifiers & denitrifiers from eutrophicated sediment was doable.