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August 2020
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104 Reads
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3 Citations
The AdjustaDepth TechnoEconomic Analysis was prepared by Mark E. Capron PE, Co-PI, under the direction of Kelly Lucas, PhD, PI and submitted April 3, 2019 to U.S. Department of Energy ARPA-E under Phase 1 Contract DE-AR0000916. Its 33 tabs present the cost and yield projections for growing Gracilaria tikvahiae in the Gulf of Mexico. It can be adapted for projections for other species and locations.
April 2019
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69 Reads
April 2019
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447 Reads
AdjustaDepth Project was funded by the U.S. Department of Energy Advanced Research Projects Agency - Energy to design an artificial reef system for growing and harvesting seaweed for advanced sustainable biofuels. The team discovered that the system grows more seaweed per hectare when it is part of a complete ecosystem with shellfish, finfish, and other animals, hence it can "feed the world on the way to abundant biofuels."
April 2019
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130 Reads
March 2019
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99 Reads
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5 Citations
The U.S. Department of Energy Advanced Research Projects Agency for Energy (ARPA-E) funded our team to grow seaweed-for-biofuel inexpensively and sustainably. We also found a way to feed the world with shellfish and finfish grown on huge floating flexible reefs without using fishmeal and while simultaneously growing seaweed. I'm Kelly Lucas, Director of the Thad Cochran Marine Aquaculture Center, Gulf Coast Research Laboratory, at the University of Southern Mississippi. I will : • Introduce our team • Explain our aquacultural revolution • Describe how nutrient cycling sustains the revolution • The features of the reef designed for the Department of Energy • Benefits of the revolution and the • Economics.
September 2018
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1,003 Reads
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9 Citations
The US Department of Energy Advanced Research Projects Agency-Energy (ARPA-E) MacroAlgae Research Inspiring Novel Energy Research (MARINER) program is encouraging technologies for the sustainable harvest of large funding research of macroalgae for biofuels at less than $80 per dry metric ton (DMT). The Ocean Forests team, led by the University of Southern Mississippi, is developing a complete managed ecosystem where nutrients are transformed and recycled. The team's designs address major bottlenecks in profitability of offshore aquaculture systems including economical moored structures that can withstand storms, efficient planting, managing and harvesting systems, and sustainable nutrient supply. The work is inspired by Lapointe [1] who reported yields of Gracilaria tikvahiae equivalent to 127 DMT per hectare per year (compared with standard aquaculture systems in the range of 20 to 40 DMT/ha/yr). This approach offers the potential for breakthrough yields for many macroalgae species. Moreover, mini-ecosystems in offshore waters create communities of macroalgae, shellfish, and penned finfish, supplemented by visiting free-range fish that can increase productivity, produce quality products, and create jobs and income for aquafarmers. Additional benefits include reduced disease in fish pens, cleaning contaminated coastal waters, and maximizing nutrient recycling. Cost projections for a successful, intensive, scaled system are competitive with current prices for fossil fuels.
August 2018
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1,786 Reads
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8 Citations
This paper describes the "SeaweedPaddock" system to profitably grow and harvest open-ocean Sargassum sp. as a sustainable source of macroalgal biomass and biofuel. The US Department of Energy Advanced Research Projects Agency-Energy (ARPA-E) initiated the MacroAlgae Research Inspiring Novel Energy Research (MARINER) program to develop technologies to eventually sustainably harvest macroalgae at $80 per dry metric ton (DMT). The University of Southern Mississippi team is characterizing an unmoored SeaweedPaddock; analyses include tow speed and energy required to avoid hazards, farm design to minimize biomass loss, economical harvesting, and nutrient supply. Initial results indicate that nighttime "smart towing" could allow the SeaweedPaddock system to produce macroalgae at full scale at costs below the ARPA-E goal provided that Sargassum grows at sufficient rates during the day after having been confined all night in a moving fence and that sufficient nutrients are made available. Cost projections for a successful, intensive, scaled system could be competitive with current prices for fossil fuels.
... Instead assuming the average yield to be that from our lowest-cost areas (that is, 2.6 kgDW m −2 or 26 tDW ha −1 ) would decrease the cost estimated by van den Burg et al. (2016) to $1,290 tDW −1 . Most recently, Capron et al. 62 calculate an optimistic scenario cost of $120 tDW −1 on the basis of an estimated yield of 120 tDW ha −1 (12 kg m −2 ; over 4.5 times higher than the average yield in our lowest-cost areas). Again, instead assuming the average yield to be that in our lowest-cost areas would raise Capron et al.'s production cost to $540 tDW −1 (between the $190-$880 tDW −1 minimum to median production costs in the cheapest 1% areas from our model; Fig. 1a,b). ...
August 2020
... Some possibly significant quantities of dry biomass could be delivered to the electricity process (Allam Cycle) for $50/tonne [50], about the same price as US coal at $2.5/GJ ($2.6/MMBTU). 5 The scale of high-protein food products paying for the reef structure (so that the cost of biomass-for-energy can be as low as $40/dry metric tonne) is limited by the demand for high-protein seafood, as identified by Lucas, Capron, et al. [17,20,42] [99]. 7 The area available for most anchored macroalgae systems assumes seafloor depths from 0-200 m, generally on relatively flat continental shelves [16,20]. ...
March 2019
... Spider web method Source:Capron et al., 2018 ...
September 2018
... One solution could be floating, autonomous seaweed farms that roam the oceans while growing seaweed [6], [7]. The controller of such floating farms needs to be able to control their position to prevent stranding, colliding with ships, or drifting to nutrient-depleted waters where the seaweed dies. ...
August 2018
