QUANTIFICATION OF PHOSPHATE REMOVAL IN A CONSTRUCTED STORMWATER - PowerPoint PPT Presentation

QUANTIFICATION OF PHOSPHATE REMOVAL IN A CONSTRUCTED STORMWATER WETLAND AND A BIOINFILTRATION RAINGARDEN John Komlos, Bridget Wadzuk and Robert Traver Villanova University 1

GOALS OF THIS STUDY 3- ) removal from stormwater using a • Quantify phosphate (PO 4 constructed stormwater wetland (CSW) and bioinfiltration raingarden. 3- removal. • Understand the mechanisms responsible for PO 4 3- • Determine the feasibility of using organic content to predict PO 4 accumulation in soil.

Inlet Outlet 3

PHOSPHATE - BASEFLOW CONDITIONS 0.066 mg/L 0.022 mg/L Dashed horizontal line represents “excessive” phosphorus concentration w.r.t. eutrophication (0.02 mg/L, Thomann and Mueller, 1987)

PHOSPHATE - STORM FLOW CONDITIONS 0.055 mg/L Dashed horizontal line represents “excessive” phosphorus concentration w.r.t. eutrophication (0.02 mg/L, Thomann and Mueller, 1987)

PHOSPHATE CONCENTRATION SORBED TO SOIL 3- as P/kg dry soil) (mg PO 4 Inlet Outlet Background: 50 ± 17 mg/kg (n=6 locations)

PHOSPHATE CONCENTRATION SORBED TO SOIL 3- as P/kg dry soil) (mg PO 4 518 ± 3.7 Inlet 418 ± 37 327 ± 41 189 ± 13 440 ± 79 421 ± 39 520 ± 1.3 141 ± 28 Outlet Background: 50 ± 17 mg/kg (n=6 locations) 639 ± 9.5 Submerged Soil: 401 ± 160 mg/kg (n=9 locations) 7

IS PHOSPHATE CONCENTRATION A FUNCTION OF PONDING DEPTH? Sampling Depth: ~2 ft Sampling Depth: ~0.5 ft 3- : 520 ± 1.3 mg/kg 3- : 141 ± 28 mg/kg PO 4 PO 4

IS PHOSPHATE CONCENTRATION A FUNCTION OF PONDING DEPTH? Sampling Depth: ~0.5 ft Sampling Depth: ~1.75 ft 3- : 421 ± 39 mg/kg PO 4 3- : 189 ± 13 mg/kg PO 4

IS PHOSPHATE CONCENTRATION A FUNCTION OF PONDING DEPTH?

IS PHOSPHATE CONCENTRATION A FUNCTION OF THE ORGANIC CONTENT OF THE SOIL?

BIOINFILTRATION RAIN GARDEN

PHOSPHATE REMOVAL IN THE RAINGARDEN 1.2 m 2.4 m 13

PHOSPHATE REMOVAL IN THE INFILTRATION BED 10.00 ponded water 1 Orthophosphate (mg as P/L) ponded water 2 z=0 1.00 z=1.2m 0.23 mg/L z=2.4m 0.10 0.03 mg/L 0.01 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Excedence Probability 14

3- ACCUMULATION WITH DEPTH INTO THE PO 4 INFILTRATION BED

3- ACCUMULATION WITH COMPARISON OF PO 4 3- CONCENTRATIONS DISSOLVED PO 4 3- accumulated on soil in the wetland (which had lower • More PO 4 3- concentrations). dissolved PO 4

3- ACCUMULATION WITH COMPARISON OF PO 4 ORGANIC CONTENT

3- ACCUMULATION WITH COMPARISON OF PO 4 ORGANIC CONTENT

• Organic content at the surface of the bioinfiltration raingarden was 0.15 ( ± 0.01, n=3). • The organic content from the raingarden correlates 300 – 600 mg/kg 3- accumulated on soil using the above CSW data. PO 4 3- /kg soil (n=4) was measured in • However, only 132 ± 26 mg PO 4 raingarden.

CONCLUSIONS 3- concentrations was observed in both the • Decrease in PO 4 constructed stormwater wetland (CSW) and bioinfiltration raingarden. 3- accumulation on soil was measured in the submerged region • PO 4 of the CSW and the infiltration bed of the bioinfiltration raingarden. 3- • The soil at the surface was saturated w.r.t. PO 4 3- accumulation correlated with the organic content of the soil. • PO 4 3- accumulation and organic content • Relationships between PO 4 3- accumulation on soil at from one SCM soil did not predict PO 4 another SCM.

ACKNOWLEDGEMENTS • Environmental Protection Agency • Federal Clean Water Act Section 319 (PaDEP) Nonpoint Source Pollution Management Program (National Monitoring Program) • Pennsylvania DEP Growing Greener • William Penn Foundation • Aqua Pennsylvania, Inc. • Villanova Urban Stormwater Partnership (VUSP) • Villanova Center for the Advancement of Sustainability in Engineering (VCASE)

ACKNOWLEDGEMENTS Jill Pietropaolo (Undergraduate: 2009) • Robert Stone (Undergraduate: 2010) • Maulin Ghandi (Graduate: 2010) • Annie Xu (High School/Undergraduate: Summer 2014) • Shannon Linnehan (Undergraduate: 2014) • Ashley Neptune (Graduate: 2014) •

Thank You!