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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)

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

slide7
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