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Published byAlvaro Wareing Modified over 9 years ago
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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
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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 Typically abundant in 2° municipal wastewater effluent (2.5 - 6 mg/L)
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ENVIRONMENTAL DEGRADATION
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PHOSPHORUS REMOVAL EPA Water Quality Criteria: Effluent concentration 10 μg/L Achieved by Chemical or Biological Removal
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CHEMICAL REMOVAL High efficiency and Easy to Implement But…… Expensive Contaminates Sewage Sludge
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BIOLOGICAL REMOVAL Presently in its infancy Enhanced Biological Phosphorus Removal (EBPR) Selects for Phosphate Accumulating Organisms (PAOs) Removes problem of sewage sludge contamination
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EBPR Initial Anaerobic Stage PAOs grab organics / Release cellular PO 4 Aeration Uptake PO 4 for Energy Production & Storage
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THE EXPERIMENT Objective: Create a Functional EBPR Batch Sequencing Reactor Two-Phase Experiment: Non-Treatment Operation Phosphorus Treatment 15% Removal <70% Removal
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PLANT SET-UP Cycling DO Control BOD Removal High Aeration Rate Plastic Covering Phosphorus Selection Stage Select for PAOs (One Hour, Anaerobic)
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EBPR RESULTS Achieved higher than expected removal 70%
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EBPR RESULTS Greater Removal than Initial Non-Treatment Phase Avg. EBPR = 0.497 mg/LAvg. Standard = 0.934 mg/L
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DISCUSSION & THOUGHTS Results show EBPR treatment works Maximum EBPR Efficiency 95% Encouraging results after 1 week of operation (HRT = 10 days)
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EBPR IMPROVEMENTS Remove competition with G bacteria SRT 3 to 5 days Feed Temp < 10°C pH > 7.2 Influent High COD : PO 4
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FUTURE OF EBPR Establishing ID of PAO bacteria Influent and Ambient Conditions Favorable to PAO Must increase removal efficiency to avoid post-EBPR chemical treatment
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THANK YOU QUESTIONSCOMMENTS
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