Bioretention column studies of phosphorus removal from urban stormwater runoff.
This study investigated the effectiveness of bioretention as a stormwater management practice using repetitive bioretention columns for phosphorus removal. Bioretention media, with a higher short-term phosphorus sorption capacity, retained more phosphorus from infiltrating runoff after 3 mg/L phosphorus loading. A surface mulch layer prevented clogging after repetitive total suspended solids input. Evidence suggests that long-term phosphorus reactions will regenerate active short-term phosphorus adsorption sites. A high hydraulic conductivity media overlaying one with low hydraulic conductivity resulted in a higher runoff infiltration rate, from 0.51 to 0.16 cm/min at a fixed 15-cm head, and was more efficient in phosphorus removal (85% mass removal) than a profile with low conductivity media over high (63% mass removal). Media extractions suggest that most of the retained phosphorus in the media layers is available for vegetative uptake and that environmental risk thresholds were not exceeded.
Hsieh
Chi-hsu
CH
Department of Civil and Environmental Engineering, University of Maryland, College Park, USA.
Davis
Allen P
AP
Needelman
Brian A
BA
D002947:Cities; D010758:Phosphorus / Q000737:chemistry / Q000302:isolation & purification*; D024301:Plant Bark / Q000737:chemistry; D011891:Rain; D012822:Silicon Dioxide / Q000737:chemistry; D012987:Soil; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*
D012987:Soil; D014874:Water Pollutants, Chemical; D010758:Phosphorus; D012822:Silicon Dioxide