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INVESTIGATION OF BIOLOGICAL PHOSPHORUS REMOVAL IN A SEQUENCING BATCH REACTOR

INVESTIGATION OF BIOLOGICAL PHOSPHORUS REMOVAL IN A SEQUENCING BATCH REACTOR. By Brett Bovee, Peter Burns, Alex Mikszewski. PHOSPHORUS (PO 4 3- ). Often is the limiting nutrient for algal growth in freshwater bodies – causes eutrophication “Anoxic Zones” caused by algal blooms – fish kills

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INVESTIGATION OF BIOLOGICAL PHOSPHORUS REMOVAL IN A SEQUENCING BATCH REACTOR

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  1. INVESTIGATION OF BIOLOGICAL PHOSPHORUS REMOVAL IN A SEQUENCING BATCH REACTOR By Brett Bovee, Peter Burns, Alex Mikszewski

  2. PHOSPHORUS (PO43-) Often is the limiting nutrient for algal growth in freshwater bodies – causes eutrophication “Anoxic Zones” caused by algal blooms – fish kills Typically abundant in 2° municipal wastewater effluent (2.5 - 6 mg/L)

  3. ENVIRONMENTAL DEGRADATION

  4. PHOSPHORUS REMOVAL EPA Water Quality Criteria: Effluent concentration  10 μg/L Achieved by Chemical or Biological Removal

  5. CHEMICAL REMOVAL High efficiency and Easy to Implement But…… Expensive Contaminates Sewage Sludge

  6. BIOLOGICAL REMOVAL Presently in its infancy Enhanced Biological Phosphorus Removal (EBPR) Selects for Phosphate Accumulating Organisms (PAOs) Removes problem of sewage sludge contamination

  7. EBPR PAOs grab organics / Release cellular PO4 Initial Anaerobic Stage Aeration Uptake PO4 for Energy Production & Storage

  8. THE EXPERIMENT Objective: Create a Functional EBPR Batch Sequencing Reactor Two-Phase Experiment: Non-Treatment Operation  Phosphorus Treatment <70% Removal 15% Removal

  9. PLANT SET-UP Cycling DO Control  BOD Removal High Aeration Rate  Plastic Covering Phosphorus Selection Stage  Select for PAOs (One Hour, Anaerobic)

  10. EBPR RESULTS Achieved higher than expected removal  70%

  11. EBPR RESULTS Greater Removal than Initial Non-Treatment Phase Avg. EBPR = 0.497 mg/L Avg. Standard = 0.934 mg/L

  12. DISCUSSION & THOUGHTS Results show EBPR treatment works Encouraging results after 1 week of operation (HRT = 10 days) Maximum EBPR Efficiency  95%

  13. EBPR IMPROVEMENTS Remove competition with G bacteria SRT  3 to 5 days Feed Temp < 10°C pH > 7.2 Influent  High COD : PO4

  14. FUTURE OF EBPR Must increase removal efficiency to avoid post-EBPR chemical treatment Establishing ID of PAO bacteria Influent and Ambient Conditions Favorable to PAO

  15. THANK YOU QUESTIONS COMMENTS

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