SLIDE 1 QUANTIFICATION OF PHOSPHATE REMOVAL IN A CONSTRUCTED STORMWATER WETLAND AND A BIOINFILTRATION RAINGARDEN
John Komlos, Bridget Wadzuk and Robert Traver Villanova University
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SLIDE 2 GOALS OF THIS STUDY
3-) removal from stormwater using a
constructed stormwater wetland (CSW) and bioinfiltration raingarden.
- Understand the mechanisms responsible for PO4
3- removal.
- Determine the feasibility of using organic content to predict PO4
3-
accumulation in soil.
SLIDE 4
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)
SLIDE 5
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)
SLIDE 6 Inlet Outlet Background: 50 ± 17 mg/kg (n=6 locations)
PHOSPHATE CONCENTRATION SORBED TO SOIL
(mg PO4
3- as P/kg dry soil)
SLIDE 7 Inlet Outlet
7
PHOSPHATE CONCENTRATION SORBED TO SOIL
(mg PO4
3- as P/kg dry soil)
327 ± 41 421 ± 39 418 ± 37 518 ± 3.7 189 ± 13 440 ± 79 520 ± 1.3 141 ± 28 639 ± 9.5 Background: 50 ± 17 mg/kg (n=6 locations) Submerged Soil: 401 ± 160 mg/kg (n=9 locations)
SLIDE 8 IS PHOSPHATE CONCENTRATION A FUNCTION OF PONDING DEPTH?
Sampling Depth: ~2 ft PO4
3-: 520 ± 1.3 mg/kg
Sampling Depth: ~0.5 ft PO4
3-: 141 ± 28 mg/kg
SLIDE 9 IS PHOSPHATE CONCENTRATION A FUNCTION OF PONDING DEPTH?
Sampling Depth: ~0.5 ft PO4
3-: 421 ± 39 mg/kg
Sampling Depth: ~1.75 ft PO4
3-: 189 ± 13 mg/kg
SLIDE 10
IS PHOSPHATE CONCENTRATION A FUNCTION OF PONDING DEPTH?
SLIDE 11
IS PHOSPHATE CONCENTRATION A FUNCTION OF THE ORGANIC CONTENT OF THE SOIL?
SLIDE 12
BIOINFILTRATION RAIN GARDEN
SLIDE 13 PHOSPHATE REMOVAL IN THE RAINGARDEN
2.4 m 1.2 m
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SLIDE 14 0.01 0.10 1.00 10.00 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Orthophosphate (mg as P/L) Excedence Probability
ponded water 1 ponded water 2 z=0 z=1.2m z=2.4m
0.23 mg/L 0.03 mg/L
PHOSPHATE REMOVAL IN THE INFILTRATION BED
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SLIDE 15
PO4
3- ACCUMULATION WITH DEPTH INTO THE
INFILTRATION BED
SLIDE 16 COMPARISON OF PO4
3- ACCUMULATION WITH
DISSOLVED PO4
3- CONCENTRATIONS
3- accumulated on soil in the wetland (which had lower
dissolved PO4
3- concentrations).
SLIDE 17
COMPARISON OF PO4
3- ACCUMULATION WITH
ORGANIC CONTENT
SLIDE 18
COMPARISON OF PO4
3- ACCUMULATION WITH
ORGANIC CONTENT
SLIDE 19
- 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
PO4
3- accumulated on soil using the above CSW data.
- However, only 132 ± 26 mg PO4
3-/kg soil (n=4) was measured in
raingarden.
SLIDE 20 CONCLUSIONS
3- concentrations was observed in both the
constructed stormwater wetland (CSW) and bioinfiltration raingarden.
3- accumulation on soil was measured in the submerged region
- f the CSW and the infiltration bed of the bioinfiltration raingarden.
- The soil at the surface was saturated w.r.t. PO4
3-
3- accumulation correlated with the organic content of the soil.
- Relationships between PO4
3- accumulation and organic content
from one SCM soil did not predict PO4
3- accumulation on soil at
another SCM.
SLIDE 21 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)
SLIDE 22 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)
SLIDE 23
Thank You!
