Investigation of biological phosphorus removal in a sequencing batch reactor
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INVESTIGATION OF BIOLOGICAL PHOSPHORUS REMOVAL IN A SEQUENCING BATCH REACTOR PowerPoint PPT Presentation


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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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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

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)


Environmental degradation

ENVIRONMENTAL DEGRADATION


Phosphorus removal

PHOSPHORUS REMOVAL

EPA Water Quality Criteria:

Effluent concentration  10 μg/L

Achieved by Chemical or Biological Removal


Chemical removal

CHEMICAL REMOVAL

High efficiency and Easy to Implement

But……

Expensive

Contaminates Sewage Sludge


Biological removal

BIOLOGICAL REMOVAL

Presently in its infancy

Enhanced Biological Phosphorus Removal (EBPR)

Selects for Phosphate Accumulating Organisms

(PAOs)

Removes problem of sewage sludge contamination


Investigation of biological phosphorus removal in a sequencing batch reactor

EBPR

PAOs grab organics /

Release cellular PO4

Initial Anaerobic Stage

Aeration

Uptake PO4 for Energy Production & Storage


The experiment

THE EXPERIMENT

Objective: Create a Functional EBPR Batch Sequencing Reactor

Two-Phase Experiment:

Non-Treatment Operation  Phosphorus Treatment

<70% Removal

15% Removal


Plant set up

PLANT SET-UP

Cycling DO Control  BOD Removal

High Aeration Rate  Plastic Covering

Phosphorus Selection Stage  Select for PAOs

(One Hour, Anaerobic)


Ebpr results

EBPR RESULTS

Achieved higher than expected removal  70%


Ebpr results1

EBPR RESULTS

Greater Removal than Initial Non-Treatment Phase

Avg. EBPR = 0.497 mg/L

Avg. Standard = 0.934 mg/L


Discussion thoughts

DISCUSSION & THOUGHTS

Results show EBPR treatment works

Encouraging results after 1 week of operation

(HRT = 10 days)

Maximum EBPR Efficiency  95%


Ebpr improvements

EBPR IMPROVEMENTS

Remove competition with G bacteria

SRT  3 to 5 days

Feed Temp < 10°C

pH > 7.2

Influent  High COD : PO4


Future of ebpr

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


Thank you

THANK YOU

QUESTIONS

COMMENTS


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