Microalgae Commodities from Coal Plant Flue Gas CO2 · 2017-06-07 · Microalgae Commodities from...
Transcript of Microalgae Commodities from Coal Plant Flue Gas CO2 · 2017-06-07 · Microalgae Commodities from...
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Microalgae Commodities from Coal Plant Flue Gas CO2 U.S. Department of Energy, Office of Fossil Energy, NETL
Cooperative Agreement DE-FE0026490, 10/01/15– 09/30/17 May 24, 2017
MicroBio Engineering Inc. John Benemann, Principal Investigator, Tryg Lundquist Co-P.I.
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• Facilities Designs • Algae Equipment • R&D and Business Consulting • Techno-Economic Analyses • Life Cycle Assessments
• Wastewater Reclamation • Nutraceuticals, Aquafeeds • Biofuels, Biofertilizers
J. Benemann T. Lundquist 2
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Pre-Fabricated
200-m2
Mobile 0.5-m2
75-m2
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MBE’s RNEW® Process for wastewater treatment and biofuels production
Recycle Nutrients Energy Water
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NETL Project Objectives • Primary Objective: Develop detailed techno-economic and life cycle
assessments specifically for OUC SEC coal-fired power plant with two microalgae CO2 utilization/mitigation options: 1. Biogas production to replace coal for maximum CO2 mitigation
(task modified to produce vehicle biofuel). 2. Commodity animal feeds production for maximum economic
benefit of flue gas CO2 use.
• Secondary Objective: Demonstrate algae biomass production using OUC SEC flue gas with native algae and conversion to biogas; evaluate suitability as animal feed.
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Participants • MicroBio Engineering Inc. (MBE), Prime , P.I.: John Benemann, CEO TEAs, LCAs, gap analyses, ponds for OUC,UF, Project management • Subrecipients: – Orlando Utilities Commission (OUC): provide data on SEC power plant, emissions, etc. ; Operate test ponds at SEC with flue gas CO2 – Univ. of Florida (UF): operate test ponds, algae anaerobic digestion – Arizona State Univ.: Train OUC and UF staff in algae cultivation – Scripps Institution of Oceanography (SIO), Lifecycle Associates (LCA), SFA Pacific Inc.: LCA, TEA and engineering assistance to MBE
SFA Dale
Simbeck
MBE John
Benemann
MBE Tryg
Lundquist
OUC Rob
Teegarden
UF Ann
Wilkie
ASU Tom
Dempster
SIO Dominick Mendola
LCA Stefan
Unnasch
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OUC-SEC ~900 MW Coal-fired PP
Landfill
Landfill Gas
Biogas
Future Algae Farm (100 ponds; 1,000 acres)
Wastewater (optional)
1. Algae à biogas for power generation (1st Year)
Flue Gas CO2 & Electricity
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Renewable Natural Gas Vehicle Fuel
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OUC-SEC ~900 MW Coal-fired PP
Landfill
Landfill Gas
Animal Feeds
Future Algae Farm (100 ponds; 1,000 acres)
Freshwater Ag Fertilizers
2. Algae à animal feed production (this year)
Flue Gas CO2 & Electricity
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Technology Background
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3-acre raceway pond with CO2 injection
Pond floors lined with clay.
Lamellar settler for harvesting Sump for CO2 transfer
Paddle wheel
Four 1.25-ha raceways in Christchurch, New Zealand. PI: Rupert Craggs, NIWA
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Paddle wheels
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Hawaii spirulina farm with large raceways
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Earthrise Nutritionals LLC plant is roughly equivalent to a module of larger modeled farm.
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50 acres of paddle wheel mixed raceway ponds for Spirulina production.
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Algae demonstration plant design at a small fossil power plant for a California utility. MBE design: Six 5-acre raceways with smaller ponds for inoculation
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Air only + CO2
Add CO2 to achieve complete nutrient assimilation during wastewater treatment.
Wastewater treatment is enhanced by CO2 addition.
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2. Two 3.5-acre raceways
Paddle wheels
Full-scale wastewater project in California. MBE & Cal Poly biofuel R&D supported by DOE BETO.
1. Facultative Ponds
3. Settling Ponds
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Algae are coagulated, settled , and solar dried. ~100,000 gallons of 3% solids
algae in decanted settling basin Solar dried algae
Concrete drying pad 16
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5-acre covered lagoon digester at a California dairy. Such low-cost design could be used for algae digestion.
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Experimental Work
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Task 2: Experimental Work at OUC and UF • Operate four 3.5-m2 ponds at each location
• At OUC, compare flue gas to pure CO2 – Productivity, metals concentration (water & biomass)
• At OUC and UF, determine seasonal productivities at optimized hydraulic residence times (HRTs)
• At UF, determine methane yields at one biomass concentration in batch methane potential tests
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Flue gas from scrubbers to condensate traps to pump to pilot ponds
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Flue gas from scrubbers to condensate traps to pump to pilot ponds
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Microalgae observed at OUC-SEC Ponds
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Filamentous algae dominate at OUC, which allows for easy harvesting of the biomass.
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Filamentous algae dominate at OUC.
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Pilot ponds at University of Florida - Gainesville
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Bioflocculating cultures that settle
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Flue gas cultures have been more productivity than pure CO2 cultures. Follow-up experiments to confirm.
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5
10
15
20
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15-Jul-16 22-Jul-16 29-Jul-16 5-Aug-16 12-Aug-16 19-Aug-16 26-Aug-16 2-Sep-16 9-Sep-16
Year-1 OUC Harvest Productivity (VSS g/m2-day) Pure, O1
Pure, O2
Flue Gas, O3
Flue Gas, O4
Biom
ass P
rodu
ctiv
ity (V
SS g
/m2 -
dayL
Bi
omas
s Pro
duct
ivity
(VSS
g/m
2 -da
yL
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Site Selection
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Potential Sites near OUC-SEC
ß Site Selected for Study
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Eastern Regional Water Reclamation Facility
Orange County Water Reclamation
Layout of 400 ha Algae Production Ponds near OUC-SEC
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Modeling
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Modeling assumptions are based on MBE experimental data and analysis. • Annual average productivity: 33 g/m2-d
– 15 g/m2-d: autotrophic growth on flue gas CO2 – 18 g/m2-d: mixo-/hetero-trophic growth on organic C from recycle of whole
anaerobic digestate to raceways – 4.5 g/m2-hr: Peak summer productivity on flue gas CO2
• 45% Overall loss factor in flue gas CO2 supply to ponds • 90% efficiency in gravity harvesting (losses are recycled to ponds) • Biogas production: 0.32 L methane/g VSS • Nutrient recycle losses: 10% nutrient loss
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Power plant assumptions are based on OUC Stanton Energy Center actual values.
• Coal Type: Illinois Basin Bituminous • 2014 CO2 Emissions: 5,076,875 tons • Flue gas composition (Post Desulfurization)
– 11% CO2
– 80 ppm SO2
– 140 ppm NOx – 100 ppm CO – 1.5 ug/scm Hg
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Techno-Economic Analysis
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Renewable natural gas (RNG) production from algae is straightforward and allows for use of wastewater.
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Capex is mostly ponds, site, and land for RNG case.
Production Ponds 21%
Site Development 14%
Biofuels Processing 12% Land
9%
CO2 & Electrical Distribution
9%
Engineering & Construction Fee
7%
Project Contingency 6%
Working Capital 4%
Field Expenses 4%
Prorateable Expenses 3%
Dewatering System 3%
Other Costs (Start-up, permits, etc)
3%
Make-up Water Syste, 2%
Inoculum Ponds 2%
Warehouse 1%
Total Capital Investment: $132,000,000 Debt: Equity 80%:20% Bond Payment (20 yrs at 5%): $8,500,000 /yr Return on Equity (15%): $3,900,000 /yr
Preliminary 37
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Distribution of opex and annualized capex Bond Repayment: $8,500,000 /yr Return on Equity: $3,900,000 /yr Operating Costs: $11,600,000 /yr Biogas Revenue: $933,000 /yr @ $2 /mmBTU CO2 Utilization Cost: $816 /metric ton (without coproducts)
Labor 20%
Depreciation 34% Property
Insurance & Tax 7%
Equipment Maintenance
15%
Electricity 7%
Make-up Water 15%
Fertilizer 2%
Opex is mostly labor, water, and maintenance for RNG case. Co-product revenue is needed for CO2 utilization.
Preliminary 38
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Wastewater treatment and transportation carbon credits are potential revenue sources.
$230
RIN, $129
LCFS, $102
$0
$50
$100
$150
$200
$250
Wastewater Credit($1,750/MG)
RIN/LCFS Credits($17/mmBtu)*
Miti
gatio
n Co
st R
educ
tion
$816/mt (cost with out coproducts) -$230/mt (wwt credit) -$102/mt (LCFS credit) -$129/mt (RIN credit) $355 /mt
Preliminary 39
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Animal feed case uses clean water and fertilizer.
Cost per ton feed and per ton CO2 fixed to be determined.
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Production Ponds, 24%
Site Development, 16%
Land, 11% CO2 & Electrical Distribution, 10%
Dewatering System, 8%
Project Contingency, 6%
Engineering & Construction Fee,
6%
Working Capital, 4%
Prorateable Expenses, 3%
Field Expenses, 3%
Make-up Water System, 3%
Other Costs (Start-up, permits, etc), 2%
Inoculum Ponds, 2% Rotary Steam Dryer, 1%
Warehouse, 1% Total Capital Investment: $115,000,000 Percent financed by debt: 80% Percent Financed by equity: 20% Bond Payment (20 yr pond at 5%): $7,400,000 /yr Return on Equity (15%): $3,500,000 /yr
Preliminary 41
Capex is similar to biogas case but with dewatering costs.
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Bond Repayment: $7,400,000 /yr Return on Equity: $3,500,000 /yr Operating Costs: $11,900,000 /yr Feed Revenue @ $350 /mt: $10,200,000 /yr CO2 Utilization Cost $249/metric ton
Labor, 20%
Depreciation, 27%
Property Insurance & Tax, 6%
Equipment Maintenance, 12%
Electricity, 9%
Fertilizer, 11%
Make-up Water, 15%
Preliminary 42
Opex is similar to RNG case but with fertilizer costs added.
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Conclusions
Economical CO2 mitigation with biogas will require a combination of:
– WWT credit – RIN and LCFS credits – Further cost cutting/process improvements
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Work in Progress • Production of animal feed instead of biogas • Land-use change • Albedo change • Non-GHG LCA impacts • Site Specific Layout • Additional sensitivity analysis
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