Amendments to Filtration for Improving Water Quality Treatment. Andy Erickson, Research Fellow St. Anthony Falls Laboratory September 13, 2012
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1 Amendments to Filtration for Improving Water Quality Treatment Andy Erickson, Research Fellow St. Anthony Falls Laboratory September 13, 2012
2 Amendments to Filtration What s in Stormwater? Dissolved pollutants Current treatment methods Compost for Metal Sorption Compost for Hydrocarbon Degradation Iron for Phosphorus Sorption Field applications and results Questions
3 What s IN Urban Stormwater? Solids (inorganic, organic) Nutrients (nitrogen, phosphorus, etc.) Metals (copper, cadmium, zinc, etc.) Deicing Agents (chloride, salts, etc.) Hydrocarbons Bacteria/Pathogens Others
4 Clay Percent passing 100% 80% 60% 40% 20% Pollutant Spectrum Al-Hamdan et al. (2007) - Miami Al-Hamdan et al. (2007) - Orlando Al-Hamdan et al. (2007) - Tallahassee Andral et al. (1999) Anta et al. (2006) Cleveland and Fashokun (2006) - Storm Cleveland and Fashokun (2006) - Non-storm Driscoll (1986) EPA (1983) Kayhanian et al. (2004) UGB Kayhanian et al. (2004) DGB Kayhanian et al. (2004) FBoE Li et al. (2006) MRSC (2000) Roger et al. (1998) Sansalone et al. (1998) Walker and Wong (1999) Westerlund and Viklander (2006) Zanders (2005) 0% Particle Size (microns) μm 0.45 μm 0.2 μm 2 μm d 50 =Silt/Sand 75 μm 4250 μm Colloids Soluble / Dissolved Silt Sand Gross Solids Organic / Float
5 Arsenic Cadmium Chromium Copper Lead Nickel Are Dissolved Pollutants Significant? Total (Dissolved + Particulate) Dissolved Median Pollutant Concentration Dissolved Fraction 45.5% 50.0% 29.7% 50.0% 18.9% 44.4% Phosphorus Zinc 44.4% 45.5% Source (adapted from): Pitt, R., Maestre, A., Morquecho, R., Brown, T., Schueler, T., Cappiella, K., and Sturm, P. (2005). "Evaluation of NPDES Phase 1 Municipal Stormwater Monitoring Data." University of Alabama and the Center for Watershed Protection.
6 Are Dissolved Pollutants Important? More Bioavailable Nutrients eutrophication Metals bioaccumulation, toxicity Petroleum hydrocarbons toxicity Pictures source: Sources: Sharpley, A.N., Smith, S.J., Jones, O.R., Berg, W.A. and Coleman, G.A. (1992) The Transport of Bioavailable Phosphorus in Agricultural Runoff. Journal of Environmental Quality 21(1), U.S. EPA. (1999) Preliminary data summary of urban storm water best management practices, U.S. Environmental Protection Agency, Washington, D.C.
7 Current Treatment Practices % TSS Removal % TP Removal Dry Ponds Wet Ponds Constructed Wetlands Sand Filter Filter Strips/Grassed Swales 0% 20% 40% 60% 80% 100% Percent Removal Source (adapted from): P.T. Weiss, A.J. Erickson and J.S. Gulliver Cost and pollutant removal of storm-water treatment practices, Journal of Water Resources Planning and Management,133(3), , 2007.
8 How Soil Amendments Improve Water Quality Physical Processes (i.e., hydraulics): Better infiltration results in more water treated (less overflow) Better filtration results in more particles captured Chemical Processes: Sorption or precipitation to bind dissolved pollutants Biological Processes: Vegetation uptake to capture or bacterial degradation to transform pollutants
9 Metals sorption to Compost Source: Morgan, J. G., Paus, K. A., Hozalski, R. M., and Gulliver, J. S. (2011). "Sorption and Release of Dissolved Pollutants Via Bioretention Media." Project Report 559. St. Anthony Falls Laboratory, University of Minnesota, Minneapolis, MN.
10 Metals sorption to Compost Source: Morgan, J. G., Paus, K. A., Hozalski, R. M., and Gulliver, J. S. (2011). "Sorption and Release of Dissolved Pollutants Via Bioretention Media." Project Report 559. St. Anthony Falls Laboratory, University of Minnesota, Minneapolis, MN.
11 Biodegradation of petroleum hydrocarbons Petroleum Hydrocarbons are captured in rain gardens through sorption and biodegradation Biodegradation prevents accumulation of petroleum hydrocarbons Rain gardens are an effective option for sustainably treating petroleum hydrocarbons in stormwater Source: LeFevre, G.H., Hozalski, R.M., and Novak, P.J. (2012, in press). "The Role of Biodegradation in Limiting the Accumulation of Petroleum Hydrocarbons in Raingarden Soils." Water Research.
12 Phosphorus Leaching from Compost Source: Morgan, J. G., Paus, K. A., Hozalski, R. M., and Gulliver, J. S. (2011). "Sorption and Release of Dissolved Pollutants Via Bioretention Media." Project Report 559. St. Anthony Falls Laboratory, University of Minnesota, Minneapolis, MN.
13 Designing for Metals and Petroleum Hydrocarbon capture with Rain Gardens Compost can capture metals and petroleum hydrocarbons but can release phosphorus, therefore: Incorporate compost in treatment practices to capture metals and hydrocarbons Ensure aerobic conditions to promote biodegradation Incorporate another process to capture any phosphorus that passes through or is leached from the compost
14 Phosphorus Sorption with Iron Sand Filtration Particulate capture > 80% Photo Courtesy: A. Erickson Enhanced Sand Filtration Steel wool increases dissolved phosphorus capture via surface sorption to iron oxide Source: Erickson, A.J., Gulliver, J.S. and Weiss, P.T. (2007) Enhanced sand filtration for storm water phosphorus removal. Journal of Environmental Engineering- ASCE 133(5),
15 Dissolved Phosphorus Concentration (mg/l) 0.4 Experimental Results (Iron Enhanced Sand Filtration, SAFL) % % 88.3% 0 Influent 100% Sand 0.3% iron 2% iron 5% iron Detection limit
16 Iron Enhanced Filter (5% iron filings, Maplewood, MN) Photo Courtesy: A. Erickson
17 Phosphorus Concentration (mg/l) Field Monitoring Results (Iron Enhanced Filter Basin, Maplewood) Total Phosphorus 75.1% Removal 29.2% Removal Dissolved Phosphorus Influent Effluent Detection limit
18 Iron Enhanced Filter Trenches wet detention ponds (Prior Lake, MN) Photos Courtesy: A. Erickson
19 Filter Trenches around wet detention ponds (Prior Lake, MN) Volume Treated by Trenches (Filter Volume) Overflow Grate Normal Water Surface Elevation Water Level Control Weir Drain tile Iron Enhanced Filter Drain tile
20 Dissolved Phosphorus Concentration (mg/l) 0.1 Field Testing Results (Iron Enhanced Filter Trenches, Prior Lake) % Removal 0 Influent 7% Iron Filings Detection limit
21 MN Filter Trenches (Prior Lake MN) MN Filter Bioretention (Carver County, MN) Photo Courtesy: A. Erickson Photo Courtesy: W. Forbord MN Filter Bioretention (Maplewood Mall, MN) MN Filter Weir (Vadnais Heights, MN) Photo Courtesy: A. Erickson Photo Courtesy: VLAWMO and EOR
22 Designing for Phosphorus Capture with Iron As iron rusts, sorption sites for phosphorus are created, therefore: Design Iron Enhanced Filter systems for watersheds with significant dissolved phosphorus fraction Ensure the system is oxygenated to ensure iron oxides remain aerobic Design systems with 8% or less iron by weight to prevent clogging
23 Other Amendments Alum (water treatment residual) & Hardwood Bark Mulch Phosphorus sorption (A. Davis, Univ. of Maryland) Commercial products (various) Internal Submerged Zone for denitrification (W. Hunt, North Carolina State University)
24 Conclusions Dissolved Stormwater Pollutants are important Approx. 45% of total concentration is dissolved Physical methods are not enough Chemical and biological mechanisms can be used to capture dissolved fractions There are field-tested solutions! Minnesota Filter (iron-enhanced sand) phosphorus Compost-amended bioretention metals & petroleum hydrocarbons
25 Stormwater UPDATES Newsletter Signup at
26 Photo Courtesy: A. Erickson For more information, contact: Andy Erickson
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