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What are microalgae?

Extraction of astaxanthin from microalgae: Process design and economic feasibility study 2017 International conference on Functional Materials and Chemical Engineering November 25 , Dubai Dr. Nancy Zgheib Holy Spirit University of Kaslik (USEK ), Lebanon. What are microalgae?.

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What are microalgae?

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  1. Extraction of astaxanthin from microalgae: Process design and economic feasibility study2017 International conference on Functional Materials and Chemical EngineeringNovember 25, DubaiDr. Nancy ZgheibHoly Spirit University of Kaslik (USEK), Lebanon

  2. What are microalgae? • Prokaryotic or eukaryotic photosynthetic • Microorganisms • Capture light energy • Convert inorganic to organic matter • Most live in water: Freshwater and Marine • Range from small single-celled species to complex multicellular species, such as the giant kelps • High growth rate and easy to grow

  3. Algae Bio-Products Problem Problem Process Process Products Benefitting Industries Coal-fired Power StationsUnderground coal mines Metal refineries Waste water remediation CO2 NOx Animal feeds Algal biofuels Fertilizer/Biochar Algae Cultivation Waste gases Biorefining N, P Metals Nutraceuticals Outcomes GHG emission abatement Water recycling Nutrient remediation Bioremediation (metals) Carotenoids Waste water

  4. Astaxanthin Haematococcuspluvialis Natural Astaxanthin Extraction

  5. Objective of the study New bioprocess to produce natural astaxanthin From Haematococcuspluvialis

  6. Construction of the process Harvesting stage • Biomass suspension flow rate = 10 Kg/h • Production of 2592 Kg of astaxanthin/year • Concentration of suspended microalgae = 1Kg/m3 Bead milling Spray drying Supercritical CO2 extraction Anaerobic digestion

  7. Harvesting phase Two-step approach: disk-stack centrifugation combined with the gravity sedimentation technique • Biomass recovery efficiency: 95% • Cake 21% TTS

  8. Cell disruption phase • Biomass recovery efficiency: 100%

  9. Drying phase • The dryer and the cyclone were designed to be a cylindrical chamber • with a diameter similar to their height and a 60° conical bottom. • Biomass recovery efficiency: 100%

  10. Extraction phase Extractor T = 60°C; P = 30MPa Supercritical CO2 extraction CO2 and ethanol as a co-solvent Volume of ethanol/CO2 = 4% 2.5% astaxanthin present in the biomass

  11. Extraction phase • Two-stage compressor (Compression ratio = 6.66) • Reciprocating compressor • Aspen Hysis SRK method T = 145.5°C

  12. Anaerobic digestion T = 70°C

  13. Economic Assessment • Equipment costs, fixed capital costs and total capital investment • Total manufacturing cost

  14. Economic Assessment • The production process becomes economically feasible for a market price higher than 1500 $/Kg. • A payback period of 1 year and an ROI equal to 113% was estimated for an astaxanthin market price equal to 6000 $/Kg.

  15. Economic Assessment • Investigation of a large scale production of astaxanthin from Haematococcuspluvialis for a potential company located inLebanon • Designing a complete process flowsheetand Sizing the major equipment of the process. • Economic assessment classified as “study estimate”. • Reference for another study that includes the process design of the cultivation of microalgae.

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