Photobioreactors vs. Ponds for Microalgae Biomass Production
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1 World AQUACULTURE SOCIETY ANNUAL MEETING World Aquaculture 2010, San Diego, CA, March 3 Photobioreactors vs. Ponds for Microalgae Biomass Production John R. Benemann Benemann Associates Walnut Creek jbenemann@aol.com
2 SUMMARY Microalgae are being proposed to be cultivated for commodities (biofuels, animal feeds) using enclosed photobioreactors (PBRs) or open ponds. PBRs can be of a large variety of designs: transparent tubes, plates, bags, etc. of various materials, dimensions, configurations (horizontal, hanging, floating, submerged, using sunlight or artificial lights, etc. Lots of I.P.!! PBRs are used in the aquaculture industry for small-scale feed production. Ponds are usually of the raceway, mixed (typically paddle wheels) type. At present essentially all (>99%) of the ~10,000 tons of microalgae biomass produced commercially worldwide for high value nutritional products uses open, mostly paddle wheel mixed, raceway-type ponds. (Aquaculture microalgae feed production is only a few hundred tons world wide). I discuss the advantages and limitations of both ponds and PBRs, and the experiences with both, in light of the need to scale-up algae biomass production for the aquaculture industry to overcome rising feed costs. I start with a review of the history of microalgae biomass production.
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4 Inoculum Tubes First algal mass culture project (for Chlorella) Plastic bag-type photobioreactors (PBRs) Roof of MIT Building~ 1950
5 40 hectare design based on MIT Rooftop pilot plant Fisher (1956), A.D. Little Co.: engineering design-cost estimate for 40 ha PBR system: 2009$>2,000,000/ha (plastic tubes ~5% of total) A rather detailed study!
6 History repeating itself: GreenFuel Technologies Roof of MIT at Campus power plant. Claimed that their PBRs captured 85% NOx & 50% CO2, and produced biodiesel at >250,000 l/ha-yr (!!!). Then tested at Arizona Public Services power plant (photoshop!), tests failed... Now are history (went broke May 2009, after $70 million).
7 Prof. W.J. Oswald pioneer of high rate ponds for algae wastewater treatment and biomass production (paddle wheel mixed pilot-scale ponds at UC Berkeley Engineering Lab 1977)
8 ASP Conception of microalgae biodiesel production Aquatic Species Program, U.S. DOE NREL Note raceway growth and settling-harvesting ponds
9 Aquatic Species Program Report Executive Summary J. Sheehan (NREL) et al. Part 1. Algal Cultures and Genetics (P. Roessler and T. Dunahay, consultants) Paul Roessler (now at Synthetic Genomics) Part 2. Algal Mass Cultures and Production Technology (J. Benemann, Principal Investigator, and J. Weissman, consultant). Report only summarizes extensive work by the ASP
10 ASP MICROALGAE R&D of PONDS: ROSWELL, NEW MEXICO Joseph Weissman., P.I., Microbial Products, Inc two 0.25 acre ponds, one lined and one unlined Demonstrated key engineering and biological parameters in algal mass cultures, such as gas transfer, mixing, effect of liners, productivity, culture stability, strain seletion, etc.
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12 WHAT IS THE BALANCE OF PROS AND CONS? Depends on what we are trying to do: for large-scale, low cost production, only can use ponds. Aquaculture needs large-scale low cost algae production; for that PBRs not feasible. ALSO: advantages of PBRs are mostly illusionary, not real! Best way is to learn from reality: commercial production experience. PBRs have: Arguments for PBRs vs. Ponds 1. Higher algae concentration / easier harvesting 2. No or little invasions by algae weeds, grazers; 3. Higher total biomass productivities (g/m2-day) 4. Better process control (T, CO2, O2, etc.). 5. Little or no evaporative water losses 6. More efficient use of CO2, nutrients etc. Ponds have: 1. Larger unit scales (hectares vs. <100 m2) 2. Lower capital ( times lower) costs 3. Lower operating costs and energy consumption 4. Self-cooling (allows evaporative cooling) 5. Pond gas exchanger (reduces O2 level)
13 Microalgae produced commercially today
14 1 st Commercial Algae Production 1960s: Chlorella In Japan, using circular ponds (these do not scale)
15 Perspective of microalgae production Earthrise Nutritionals LLC., S. California
16 Dunaliella salina, NBT Israel (Ami BenAmotz] CO2
17 Microalgae Products: >95% nutraceuticals, total world production ~10,000 tons (~1% PBRs)
18 Cyanotech Co. Open, raceway ponds, algae plant in Hawaii. Red ponds for Haematococcus pluvialis for astaxanthin. others Spirulina NOTE red ponds source of oil used in flight by Continental
19 EXAMPLE OF A COMMERCIAL PBR (only a few): Photobioreactors in Israel (>300 km tubes!) for a very high value product (astaxanthin >$100/kg biomass, Haematococcus pluvialis).... failed, closed, reopened, now going to ponds!
20 BPS GmbH (Germany) Aquasearch, Inc. (USA) Fuji, Inc (USA) More examples of commercial photobioreactors Addavita Ltd (UK) F& M S.r.l. (Italy) Biosynthesis co. (UK)
21 PBRs Studied for over 50 years: DO NOT SCALE!
22 Paper in response to many claims that PBRs superior to open ponds. Points out problems of both open ponds and closed PBRs. Main issue for PBRs scalability: unit size <1000 m2. Also PBRs are too expensive for biofuels but good for inoculum (~1% of biomass) production.
23 Open Ponds vs. Closed Photobioreactors Parameter Relative Impact Note Contamination risk Ponds > PBRs Just a matter of time for either Productivity Ponds ~ PBRs NO substantial difference* Space required Ponds ~ PBRs A matter of productivity Water losses Ponds ~ PBRs Evaporative cooling needed CO2 losses Ponds ~ PBRs Depends on ph, alkalinity, etc. O2 Inhibition Ponds < PBRs O2 major problem in PBRs Process Control Ponds ~ PBRs no major differences (weather) Biomass Concentration Ponds < PBRs function of depth, 2-10 fold Capital/Operating Costs Ponds << PBRs Ponds >>10 x lower cost! *Productivity can be higher if PBRs are in vertical orientation or in cold conditions where the heat retained allows faster growth of the algae. CONCLUSION: Are PBRs better than ponds? Sometimes: in cold climate, not in hot. Advantages overstated. Key issue is COST
24 CONCLUSION: Open ponds only option for algal biofuels production. Key Question: how large can we make them? Paddle wheel Design specs: cm deep cm/sec mix Dilute 20-40%/d ph range
25 Paddle wheels for mixing high rate ponds. Mixing at below 30 cm/sec minimizes energy use
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27 E.ON at Power Plant, Hamburg, Germany October 2008 J.R. Benemann, October 24, 2008, Algae Biomass Summit
28 Novagreen System, Germany, used by RWE in project to capture CO2 from power plant flue gas (will need a billion of such bags?)
29 Solix Pilot Plant, Colorado (Summer 2009)
30 NOTE: NOT CO2 SEQUESTRATION (no different than any other biofuels) CAR CO2 Biodiesel Algae CO2 Israel Electric Power Company Ami BenAmotz coal
31 Prior techno-economic analyses for open pond microalgae biofuel production (most now available at Benemann, J.R. P. Pursoff, & W.J. Oswald, Engineering Design and Cost Analysis of a Large-Scale Microalgae Biomass System, Final Report US DOE. NTIS #H CP/T UC-61. Benemann, J.R., R.P. Goebel, J.C. Weissman, & D.C. Augenstein Microalgae as a source of liquid fuels. Final Report U.S.DOE BER Weissman, J.C., & R.P. Goebel, Design and analysis of microalgal open pond systems for the purpose of producing fuels Report to US DOE- SERI (for the Aquatic Species Program) Benemann, J.R. & W.J., Oswald 1996, Systems and economic analysis of microalgae ponds for conversion of CO2 to biomass. Report to US DOE-NETL (National Technology Energy Laboratory) Caution: These reports lack in design and cost details and made many very favorable assumptions about process. Conclusion: it may not be impossible to produce algae biofuels (but it may be a little easier to produce commodity feeds)
32 THE POTENTIAL AND PROMISE OF ALGAE BIOMASS current crops, future algae biomass industry U.S. Avg. Yield Protein 1,000s Ha Total Protein CROP Mg/ha-yr Mg/ha-yr Harvested 1,000 Mg/yr CORN GRAIN ,400 23,100 SOYBEAN ,400 28,800 ALGAE ,000 50,000 CONCLUSION: YES, WE CAN.., AT LEAST WE CAN TRY We must try to achieve, at least come as close as we can, to this transformative vision of very high algae productivity!
33 Each species, even each strain has its own story 11 Division, 29 classes vs. 2/12 vascular plants described species (< 10% of estimated)
34 ROTIFERS ( JUST ONE TYPE OF ALGAE GRAZER] Must manage ponds for algal species & culture stability
35 Example of why we need GMA Attempts to find mutants with small antenna size for high productivity resulted in mutants that had desired low pigment level-small antenna size, Abut were slow growing/low productivity WILL NEED GMA technology! WT CM1 CM2 CM1-1 CM3 CM7
36 ALGAL BIOMASS ORGANIZATION 1 st Summit San Francisco Nov nd Summit Seattle, Oct rd Summit San Diego, October th Annual Algae Biomass Summit September 2010, Phoenix, AZ Join Now!
37 ANY QUESTIONS?
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