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Bioreactors for the Reduction of Nutrient Transport

Bioreactors for the Reduction of Nutrient Transport. Why Bioreactors ?. Proven technology Requires no modification of current practices No land taken out of production No decrease in drainage effectiveness Very low maintenance Estimated life - 15 to 20 years Cost effective. Diversion

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Bioreactors for the Reduction of Nutrient Transport

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  1. Bioreactors for the Reduction of Nutrient Transport

  2. Why Bioreactors ? • Proven technology • Requires no modification of current practices • No land taken out of production • No decrease in drainage effectiveness • Very low maintenance • Estimated life - 15 to 20 years • Cost effective

  3. Diversion Structure Second Generation Bioreactors Length dependent on treatment area 5’ Soil Backfill Capacity Control Structure 20’ section of tile Trench bottom 1’ Below tile invert Woodchips

  4. 5’ Soil backfill 10’ Wide Top View 5’ section of non-perforated tile Diversion structure Capacity control structure Length dependent on treatment area Up to soil surface Side View Trench bottom 1’ below tile invert

  5. Third Generation Bioreactors

  6. Plastic Liner Solid pipe Perforated pipe Perforated pipe Solid pipe

  7. Managed Drainage With Bioreactor 34 acres 100 ft Spacing Managed Drainage 28 acres 100 ft Spacing W Free Drainage 31 acres 100 ft Spacing

  8. Bioreactor Efficacy

  9. Sizing a system for a 60% removal from 40 acres ?

  10. 100*40/3 = 1333 sq. ft.

  11. Current Work

  12. Unintended Consequences?

  13. Sampling Bioreactors Inlet Samples Outlet Samples

  14. Dissolved MeHg in Bioreactor Inlets -Eight non-detects -Six samples contained detectable MeHg - Maximum: 0.16 ng/L - Average: 0.09 ng/L

  15. Dissolved MeHg in Bioreactor Outlets

  16. Dissolved MeHg in Bioreactor Outlets

  17. 5’ Soil backfill 10’ Wide Top View 5’ section of non-perforated tile Diversion structure Capacity control structure Length dependent on treatment area Up to soil surface Side View Trench bottom 1’ below tile invert Trench bottom at tile invert

  18. What about Phosphorus? P Removal?

  19. Four 6” PVC Bioreactor Cells 20 ft Woodchips 5 ft Iron Filings Two Cells with Filings Upstream Two Cells with Woodchips Upstream Temperature Sensors Gas Extraction Ports

  20. Plastic Liner Solid pipe Perforated pipe Perforated pipe Solid 6” pipe Phosphorus Removal Chamber

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