BioMag: New Technology for Cost Effective ENR Upgrades ......BioMag: New Technology for Cost...
Transcript of BioMag: New Technology for Cost Effective ENR Upgrades ......BioMag: New Technology for Cost...
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BioMag: New Technology
for Cost Effective
ENR Upgrades
Steve Woodard, Ph.D., P.E.
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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
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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
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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
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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!
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BioMag: Enhanced Biological Treatment
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4-Stage Bardenpho Process Flow
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BioMag Pilot Trailer
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Magnetite Feeder
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Shear Mill
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Recovery Drum
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Rapid Clarification Increases Capacity
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Magnets Are Used to Recover Magnetite
Video clip
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Winebrenner Plant Layout
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BioMag Influent and Effluent Nitrogen
Influent TKN
Effluent NH4 + NO2 + NO3
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BioMag Influent and Effluent N, lbs/day
Influent TKN
Effluent NH4 + NO2 + NO3
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BioMag Effluent TN and NH4 + NO2 + NO3
Total Nitrogen
NH4 + NO2 + NO3
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BioMag MLSS(not including magnetite)
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BioMag Effluent TSS
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BioMag Effluent Total P
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BioMag Wet Weather Flow Performance
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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