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Wood-based vs. Coal-based GAC a LCA comparison. Manatee County Water Purification Plant Carolina Bianco, John Friary, Rick Loftis. Outline. Background LCA Levels Results Impact Assessment Conclusion. Background- MCWPP. Sarasota and Manatee Counties

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wood based vs coal based gac a lca comparison

Wood-based vs. Coal-based GACa LCA comparison

Manatee County Water Purification Plant

Carolina Bianco, John Friary, Rick Loftis

outline
Outline
  • Background
  • LCA Levels
  • Results
  • Impact Assessment
  • Conclusion
background mcwpp
Background- MCWPP
  • Sarasota and Manatee Counties
  • Capacity: 24.9 MGD surface water, 12.7 MGD groundwater in 2000
  • Current treatment process for surface water
    • PAC
    • Coagulation
    • Sedimentation
    • Filtration
    • Disinfection
background mib
Background- MIB
  • MIB: methyl•iso•borneol, metabolite of some blue-green algae & bacteria
  • MIB causes musty taste and odor in water, odor threshold: (5-7 ppt)
  • Current MIB concentration (10 to 100 ppt)
  • Desired concentration: (<5 ppt)
  • TOC concentration: (12 ppm)
background mib removal
Background - MIB removal
  • Current method: PAC (~800lb/MG)
  • Possible Alternatives: Ozonation, chlorination, copper sulfate & other algal inhibitors, GAC
  • Ozonation & ChlorinationDBP
  • Copper Sulfate, et. al.heavy metals in water!!
  • Proposed method: GAC
background activated carbon
Background – Activated Carbon
  • 2000 BC
  • 300,000+ tons per year worldwide
  • Wood, coal, lignite, coconut shell, peat…
  • Any cheap, high carbon compound with low inorganics
  • Powdered or Granular
  • 500 to 3,000 m2/g (~1,000 m2/g) (100+ac/lb)
  • Giant Filter
background pac vs gac
PAC

Diameter: <0.1mm

Water treatment

Cost: ~$0.45/lb

CUR: ~800lb/MG

Not reusable*

GAC

Diameter: 1.2 to 1.7 mm

Gas treatment

Cost: $0.70 to $1.15+/lb

CUR: ~300lb/MG

Reusable

Background – PAC VS GAC
background volume of gac
Background – Volume of GAC
  • MGD: 29.4
  • Length of Regeneration Cycle: 183 days
  • CUR: 300 lb/MG
  • Density of Wood-Based GAC: 21.84 lb/ft3
  • GAC Volume = MGD*Cycle Days*CUR/density
  • Volume = 29.4 * 183 * 300 / 21.84 =

73,000 ft3 (20 beds, 10ft*19ft*19ft)

lca coal vs wood based
Coal

Conversion from raw material: 35%

Density: 31.2 lb/ft3

Cost: $0.70/lb

CUR: 429 lb/MG

CUR-vol: 13.75ft3/MG

% lost during regeneration: 12.5%

Wood

Conversion from raw material: 50%

Density: 21.84 lb/ft3

Cost: $1.15/lb

CUR: 300lb/MG

CUR-vol: 13.75ft3/MG

% lost during regeneration 20%

LCA: Coal- vs Wood-Based
lca functional unit
LCA: Functional Unit

Cubic Feet of GAC per year to reduce MIB concentrations below 5 ppt.

lca level 1 0
LCA: Level 1.0

Phosphoric Acid

Raw materials (wood or coal)

Ammonia

Phosphoric Acid (wood)

Water, CO2

Removal of MIB by Activated Carbon

Carbon fines

Water

Formaldehyde

MIB, TOC

Formic Acid, Methanol

Energy

Metallic compounds

Binders

level 2 0 for coal or wood
Level 2.0 for Coal or Wood

Raw Material Extraction

Waste

Energy

Coal or Wood

Manufacturing (Activation)

Waste

Energy

Reactivation

Activating agents, Binders

GAC

Waste gas

Energy

GAC Filter Beds

Water

Solids to landfill

Drinking water

MIB, TOC

level 2 1 2 a manufacturing of wood based gac
Level 2.1.2-A Manufacturing of Wood-based GAC

To Atmosphere

Off-Gas Treatment

Activation Kiln

Mixer

Sawdust

water

Wash

Acid Recovery Unit

water

Acid Make Up (H3PO4)

Drying Kiln

To Atmosphere

Screen

Dust Collector

Granular Activated Carbon

conclusion coal vs wood
Coal

Total Emissions: lower

Total Human Risk from chemicals: lower

Cost: lower

Worker Deaths: 30-40

GWP: higher

Impact on Ecology: higher

Wood

Total Emissions: higher

Total Human Risk from chemicals: higher

Cost: higher

Worker Deaths: 0

GWP: lower

Impact on Ecology: lower

Conclusion – Coal vs Wood
acknowledgments
Acknowledgments
  • Dr. Mazyck
  • Dr. Lindner
  • Dr. Kirmse
  • Julee MacKenzie
  • Brandy Smith