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MC & UM Algae/Biodiesel Project • Background Review • Status as of May 12, 2009 MCES Interest in Algae GHG 1.0 -> 0.3 Hypoxia CO2 + P + N + light Concept 1) Extract oil from algal cell mass – some species => 50% oil by weight 2) Use catalytic hydrothermal gasification on wet material to generate usable synthetic gas, heavy oil, and char Project Goal Determine the technical and economic feasibility of using algae to reduce nutrient and carbon dioxide emissions and subsequently recover oil and other energy products from the algal cell mass. MC Focus • Phosphorus removal – MPCA proposing substantial reduction in effluent limits – Any value from cell mass reduces net cost of P removal • CO2 removal and value of credits • Nitrogen removal Metro Plant Schematic Scrn Grit Primary Settling Activated Sludge Aeration Final Settling Sludge Thickening Dewatering centrate Disinfect Sludge Incineration Application at Metro Concentration Mass Total N centrate 125 mg/l 1,040 lb/day Soluble P centrate 190 mg/l 1,580 lb/day 1.7 – lb/lb dry sludge burned 430 ton/day CO2 incineration Oil Production Potential centrate P - mg/l 200 measure P removal - % 50 assume centrate flow - mgd 1 known algal cell mass - % P 1 literature P removal - lb/day 833 calculate algal cell mass produced - lb/day 83,300 calculate algal cell oil content - % 20 assume oil recovery efficiency - % 80 assume oil production - lb/day 13,328 calculate oil production – gal/day 1,780 calculate UM Screening Algal Species UM Bioreactor Design UM/MC Harvesting Experiments Metro Pilot Plant Located in SMB Door closed to protect intellectual property – reactor design Experimental Reactors Reactor A Reactor B Tanks 4 4 Type Plug Flow Mixed 1.5 X X Light intensity Simplified Growth Model CO2 + N + P + light O2 + Corganic + O2 + N + P CO2 + Pilot Plant Performance* Reactor A Reactor B TSS Produced 497 gm/day 415 gm/day STP removed 47 gm/day 43 gm/day STP removed 67% 60% * Varying wasting schedule during startup – not steady state operation Project Funding Phase 1 Phase 2 MC $40k $250k UM – IREE $40k $250k Xcel Energy $150k State of Minn ______ $500k__ Totals $1,000k $230k
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