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www.ContechES.com 
Maximizing Phosphorus Load 
Reduction 
Presented By: Derek M. Berg 
Southeast New York Stormwater Confe...
 Phosphorus: What is it and where does it come from? 
 How do we address Phosphorus in Urban Runoff? 
 Raising the bar ...
Why do we care about Phosphorus? 
 Aren’t nutrients a good thing? 
 Phosphorus is usually the most limiting nutrient 
ww...
www.ContechES.com 
Sources of Phosphorus 
 Weathering of calcium phosphate minerals, 
especially apatite 
 Anthropogenic...
www.ContechES.com 
Forms of Phosphorus 
 Total P: Is most common measure of phosphorus 
concentrations in runoff and wate...
www.ContechES.com 
Phosphorus in Lakes 
Lake Productivity 
Classification 
Total Phosphorus mg/L 
Ultra-oligotrophic <5 
O...
www.ContechES.com 
Phosphorus in Stormwater 
• Phosphorus is often in both solid and soluble forms 
• Solid phosphorus ten...
www.ContechES.com 
Phosphorus in Stormwater 
Source: NYSDEC Chap. 10 NYS Stormwater Management Design Manual
How do we address TP in runoff? 
www.ContechES.com 
• Good Housekeeping 
• Runoff Reduction 
• Sedimentation 
• Biofiltrat...
www.ContechES.com 
(Not So) Good House Keeping 
Source Washington State Water Quality Consortium
Runoff Reduction 
 Preventing runoff from occurring or reaching receiving waters 
eliminates all of the pollutants that w...
Removing Phosphorus With Treatment 
Three primary mechanisms to removal Phosphorus from Urban 
runoff: 
Sedimentation Phys...
www.ContechES.com 
Sedimentation 
Examples: Ponds, Vaults, Detention Systems, Hydrodynamic Separators 
• Slow water down a...
www.ContechES.com 
Physical Filtration 
Examples: Screening, Media Filters, Sand Filters, Biofilters, Infiltration 
• Phys...
www.ContechES.com 
Maximizing TP Removal
www.ContechES.com 
Reactive Filtration/ Processes 
Reactive filtration media with an affinity for target pollutants, 
orga...
www.ContechES.com 
Common Treatment Practices
www.ContechES.com 
Wet Pond (Sedimentation)
SandFilter (Sedimentation, Physical Filtration) 
www.ContechES.com
www.ContechES.com 
Bioretention/Biofiltration 
Source: NYSDEC Chap. 5 NYS Stormwater Management Design Manual
Raising the Bar on TP Removal With Innovative 
www.ContechES.com 
Solutions
www.ContechES.com 
Case Study 4 
Bioretention Soil Amendment 
Fleming College, Ontario
www.ContechES.com 
Bioretention Soil Mix Amendment 
with Phosphorus-Adsorbing Sorbtive Media 
Fleming College, Centre for ...
Results: TDP Removal Efficiency 
www.ContechES.com 
100 
90 
80 
70 
60 
50 
40 
30 
20 
10 
0 
TDPs Influent Conc 
(0.2 m...
Lakewood Park - Chautauqua Lake 
Retrofit DI’s 
• Sorbtive Media applied 
in a layer above 
underdrain pipe 
www.ContechES...
www.ContechES.com 
2 
Filterra® Bioretention
www.ContechES.com 
Filterra Overview 
 Optimized media gradation 
 Functions as living biological system 
 Simple Maint...
The Stormwater Management StormFilter® 
www.ContechES.com
www.ContechES.com 
PhosphoSorb Media 
 Lightweight, oxide coated, non 
toxic, reactive media 
 Lab testing showed excell...
www.ContechES.com 
Solids Removal- SOL
www.ContechES.com 
Phosphorus Removal- SOL
Fleming College 
www.ContechES.com 
Soil Mix Composition 
 Sand 
 Peat Moss 
 Sorbtive® Media AI 28x48 
• High surface ...
Regulatory Challenges 
 NYSDEC 80% TSS, 40% TP threshold is essentially pass fail 
 Currently no review process in place...
www.ContechES.com 
Summary
www.ContechES.com 
Questions??? 
Derek Berg 
dberg@conteches.com 
207-885-6174
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Maximizing Phosphorus Load Reduction

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This presentation explores the issue of phosphorus in stormwater runoff, including what it is, where it comes from, and common phosphorous treatment practices.

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Maximizing Phosphorus Load Reduction

  1. 1. www.ContechES.com Maximizing Phosphorus Load Reduction Presented By: Derek M. Berg Southeast New York Stormwater Conference October 15, 2014
  2. 2.  Phosphorus: What is it and where does it come from?  How do we address Phosphorus in Urban Runoff?  Raising the bar on phosphorus removal the latest research www.ContechES.com and innovation Agenda
  3. 3. Why do we care about Phosphorus?  Aren’t nutrients a good thing?  Phosphorus is usually the most limiting nutrient www.ContechES.com in freshwater systems  Too much of a good things makes watersheds sick
  4. 4. www.ContechES.com Sources of Phosphorus  Weathering of calcium phosphate minerals, especially apatite  Anthropogenic (human) P is often much greater than natural inputs of P in many watersheds  Common anthropogenic sources: agriculture, wastewater, excess fertilizer, faulty septic  Wildlife can also contribute significant amounts of phosphorus to local watersheds
  5. 5. www.ContechES.com Forms of Phosphorus  Total P: Is most common measure of phosphorus concentrations in runoff and watersheds. TP = DIP + DOP + PP  We often measure both particulate and dissolved fractions of phosphorus o Dissolved P o Ortho P o Soluble Reactive P  TP is most commonly regulated
  6. 6. www.ContechES.com Phosphorus in Lakes Lake Productivity Classification Total Phosphorus mg/L Ultra-oligotrophic <5 Oligotrophic 5-10 Mesotrophic 10-30 Eutrophic 30-100 Hypereutrophic >100 Phosphorus concentrations in untreated stormwater are often many times higher than those in receiving waters!
  7. 7. www.ContechES.com Phosphorus in Stormwater • Phosphorus is often in both solid and soluble forms • Solid phosphorus tends to be associated with finer particles • Ratio of solid/soluble is often variable. Research suggests 50/50 split is a reasonable estimate (NYSDEC Chap. 10) • Previously captured particulate can be leached as soluble P
  8. 8. www.ContechES.com Phosphorus in Stormwater Source: NYSDEC Chap. 10 NYS Stormwater Management Design Manual
  9. 9. How do we address TP in runoff? www.ContechES.com • Good Housekeeping • Runoff Reduction • Sedimentation • Biofiltration • Media Filtration
  10. 10. www.ContechES.com (Not So) Good House Keeping Source Washington State Water Quality Consortium
  11. 11. Runoff Reduction  Preventing runoff from occurring or reaching receiving waters eliminates all of the pollutants that would be carried by that runoff www.ContechES.com  Reduce runoff via LID site design concepts  Retain water onsite o RWH o Bioretention o Pervious pavers o Infiltration Systems
  12. 12. Removing Phosphorus With Treatment Three primary mechanisms to removal Phosphorus from Urban runoff: Sedimentation Physical Filtration Reactive Filtration www.ContechES.com
  13. 13. www.ContechES.com Sedimentation Examples: Ponds, Vaults, Detention Systems, Hydrodynamic Separators • Slow water down and allow solids to settle • Longer residence time = finer particles captured • Phosphorus removal often tied to residence time • No capture of dissolved/soluble P • Leaching possible
  14. 14. www.ContechES.com Physical Filtration Examples: Screening, Media Filters, Sand Filters, Biofilters, Infiltration • Physical barrier to solid particles • Good control of TSS and attached pollutants • Good removal of particulate metals and phosphorus • No removal of dissolved/soluble pollutants • Leaching possible • Longevity must be considered
  15. 15. www.ContechES.com Maximizing TP Removal
  16. 16. www.ContechES.com Reactive Filtration/ Processes Reactive filtration media with an affinity for target pollutants, organic matter, • Often works in parallel with physical filtration and/or sedimentation • Target pollutant is bound to media via adsorption, ion exchange etc. • Effective removal of soluble/dissolved pollutants • Boosts overall pollutant load reduction • Prevents leaching
  17. 17. www.ContechES.com Common Treatment Practices
  18. 18. www.ContechES.com Wet Pond (Sedimentation)
  19. 19. SandFilter (Sedimentation, Physical Filtration) www.ContechES.com
  20. 20. www.ContechES.com Bioretention/Biofiltration Source: NYSDEC Chap. 5 NYS Stormwater Management Design Manual
  21. 21. Raising the Bar on TP Removal With Innovative www.ContechES.com Solutions
  22. 22. www.ContechES.com Case Study 4 Bioretention Soil Amendment Fleming College, Ontario
  23. 23. www.ContechES.com Bioretention Soil Mix Amendment with Phosphorus-Adsorbing Sorbtive Media Fleming College, Centre for Alternative Wastewater Treatment Ontario, Canada Case Study 3
  24. 24. Results: TDP Removal Efficiency www.ContechES.com 100 90 80 70 60 50 40 30 20 10 0 TDPs Influent Conc (0.2 mg/L) TDPs Influent Conc (0.4 mg/L) TDPs Influent Conc (0.6 mg/L) TDPs Influent Conc (0.8 mg/L) % TDP Removal Control Sorbtive Media 5% Sorbtive Media 10%
  25. 25. Lakewood Park - Chautauqua Lake Retrofit DI’s • Sorbtive Media applied in a layer above underdrain pipe www.ContechES.com
  26. 26. www.ContechES.com 2 Filterra® Bioretention
  27. 27. www.ContechES.com Filterra Overview  Optimized media gradation  Functions as living biological system  Simple Maintenance  Consistent field removal of >60% TP  Can be deployed boxless
  28. 28. The Stormwater Management StormFilter® www.ContechES.com
  29. 29. www.ContechES.com PhosphoSorb Media  Lightweight, oxide coated, non toxic, reactive media  Lab testing showed excellent removal of dissolved P  TAPE and TARP field testing showing >70% TP reduction and excellent removal of DP
  30. 30. www.ContechES.com Solids Removal- SOL
  31. 31. www.ContechES.com Phosphorus Removal- SOL
  32. 32. Fleming College www.ContechES.com Soil Mix Composition  Sand  Peat Moss  Sorbtive® Media AI 28x48 • High surface area phosphorus-adsorbing media • Sand-like gradation • Added to soil mix on volume basis, ranging 0% - 17%  Soil components mixed in buckets of 2 front-end loaders
  33. 33. Regulatory Challenges  NYSDEC 80% TSS, 40% TP threshold is essentially pass fail  Currently no review process in place to assign specific TP www.ContechES.com credit to BMPs  Limited value in achieving >40% TP without means of taking regulatory credit  In load sensitive watersheds
  34. 34. www.ContechES.com Summary
  35. 35. www.ContechES.com Questions??? Derek Berg dberg@conteches.com 207-885-6174

This presentation explores the issue of phosphorus in stormwater runoff, including what it is, where it comes from, and common phosphorous treatment practices.

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