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BioMag: New Technology
for Cost Effective
ENR Upgrades
Steve Woodard, Ph.D., P.E.
Outline
Intro to CWT
Secondary clarification: the weak link
BioMag: ballasted biological treatment
• How does it work?
• Applications
• ENR Technology
Winebrenner BioMag trial in Cascade, MD
ENR without the denit filters
Significant potential cost savings in Maryland
The Challenges of Biological Treatment
Secondary clarification is the bottleneck of activated sludge treatment
• Filamentous bulking
• Storm flow issues (I&I)
• Pin floc
Limits MLSS concentration
Limits nutrient removal
capacity
Compromises effluent quality
Requires expensivesolutions to correct
Magnetite: the Enabler
Magnetite is Fe3O4,
• Doesn’t rust or degrade
• Completely inert
Two critical properties:
• It’s dense;specific gravity: 5.2
• Magnetically controllable
The Benefits of Ballasted Biological Floc
Ballasted floc ensuresrapid, reliable settling
Facilitates increased MLSS concentrations
Maintains control over sludge blankets (I&I)
Frees up tankage for nutrient removal (e.g. anoxic zones)
Provides clean effluent –low TSS
Facilitates low effluent TN!
BioMag: Enhanced Biological Treatment
4-Stage Bardenpho Process Flow
BioMag Pilot Trailer
Magnetite Feeder
Shear Mill
Recovery Drum
Rapid Clarification Increases Capacity
Magnets Are Used to Recover Magnetite
Video clip
Winebrenner Plant Layout
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1/22/2010 2/11/2010 3/3/2010 3/23/2010 4/12/2010 5/2/2010 5/22/2010 6/11/2010
Nit
rog
en
, m
g/
l
Date
BioMag Influent and Effluent Nitrogen
Influent TKN
Effluent NH4 + NO2 + NO3
0.0
5.0
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1/22/2010 2/11/2010 3/3/2010 3/23/2010 4/12/2010 5/2/2010 5/22/2010 6/11/2010
Nit
rog
en
, lb
s/
day
Date
BioMag Influent and Effluent N, lbs/day
Influent TKN
Effluent NH4 + NO2 + NO3
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2/21/2010 3/3/2010 3/13/2010 3/23/2010 4/2/2010 4/12/2010 4/22/2010 5/2/2010 5/12/2010 5/22/2010 6/1/2010
Eff
luen
t N
, m
g/
l
Date
BioMag Effluent TN and NH4 + NO2 + NO3
Total Nitrogen
NH4 + NO2 + NO3
0
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2/1/2010 2/21/2010 3/13/2010 4/2/2010 4/22/2010 5/12/2010 6/1/2010
MLS
S, m
g/
l
Date
BioMag MLSS(not including magnetite)
0.0
5.0
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2/1/2010 2/21/2010 3/13/2010 4/2/2010 4/22/2010 5/12/2010 6/1/2010
Eff
luen
t TS
S,
mg
/l
Date
BioMag Effluent TSS
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
2/14/2010 2/24/2010 3/6/2010 3/16/2010 3/26/2010 4/5/2010 4/15/2010 4/25/2010 5/5/2010 5/15/2010 5/25/2010
Eff
luen
t TP
, m
g/
l
Date
BioMag Effluent Total P
BioMag Wet Weather Flow Performance
ENR Without the Filters
Excellent, reliable TN removal
Same for TP
Low effluent TSS (< 5 mg/l)
High MLSS and low, stable sludge blanket
Frees up tankage for anoxic zones
Often eliminates need for new process tankage and/or IFAS
Also eliminates need for filters
Mitigates impacts of I&I
Scales up very well
Recommended