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Algae Production Coupled with Anaerobic Digestion for Sustainable Biofuel in Closed Systems

This paper explores the innovative approach of producing biofuels from algae coupled with anaerobic digestion in a closed vessel system. It discusses the composition, advantages, and disadvantages of algae, focusing on cultivation methods in a controlled environment. Through a detailed analysis of the production process, including biogas generation and biodiesel extraction, this study highlights the potential of algae as a renewable energy source without competing with food crops. The research aims to improve biomass yield and efficiency, paving the way for sustainable biofuel applications.

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Algae Production Coupled with Anaerobic Digestion for Sustainable Biofuel in Closed Systems

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  1. Production of algae coupled to anaerobicdigestionin a closedvessel system forbio-fuelproduction In cooperation with

  2. Introduction • (onlypictures )

  3. Contents • renewable and durable energy • Biofuel production • Composition of algae • Advantages and disadvantages • Cultivation methods • Production process • Algae research • Manipulation of algae • Applications

  4. Renewable and durableenergy • Renewable energy • Inexhaustible sources • Durable energy • Inexhaustible sources • Not detrimental to environment and economy

  5. Biofuelproduction • Obtained from biomass • Divided into three generations • Food crops  conventional fermentation  chemical processes 2. Crops specially farmed  competition with food crops 3. New developments ( + GM )  algae  no competition with food crops

  6. Composition of algae • Eukaryotic photosynthetic organisms • Sunlight  biomass (sugar and lipids) • Nutrients  nitrogen and phosphorus • CO2  natural oil • Rich in oil components  high primary production  saturated fatty acids • Oil levels: 20% - 75%

  7. Advantages and disadvantages • Advantages • Harvested in all seasons • Rich in fats • Grow fast • On land not suitable for agriculture • CO2neutral • Improving quality of waste water

  8. Advantages and disadvantages • Disadvantages • Growth  fat production • Separating oil  expensive  polluting • Growth depends on sunlight • Many nutrients needed + aqueous environment

  9. Cultivation methods • Open system • Disadvantages • Contact withatmosphere evaporation • No stabletemperature • Contamination • Limitedalgae species

  10. Cultivationmethods • Closed systems • Advantage • No evaporation • Stable temperature • No contamination • Higher biomass and efficient accumulation of CO2 • Disadvantages • Expensive • CO2 injection needed

  11. Production process • Biogas • Hydrolisis • Break long polymeres • Acidogenesis • Fermentation with acidogenic bacteria • Methanogenesis • Into methane gas by methane-forming archaea

  12. Productionprocess • Biodiesel • Base catalyzed transesterification of the oil • Extract oil, drying + adding hexane • Distillation pure algaeoil • Mixingwithcatalyst + alcohol • Glycerol and biodiesel

  13. Research • First industry about 1953 • Two closed bag photoreactors • Food production • Past five years • Algae oil production • Replacement for oil • AlgaePARC • Research micro-algae cultivation systems • Seven systems

  14. Manipulation of algae • Genetic modified • higher yield of biomass or lipids • Increasing number of chloroplasts • Modify metabolism • Only accepted in closed systems • Selecting species • Adjusting cultivation techniques

  15. Applications • Algae Food&Fuel • Just been booted (BioSoil, Tendris and Solarix) • Industrial production of micro-algae • Turbid state, open system • 50kg dry mass/day/Ha • Desert regions • Plenty of sunshine • Water unusable for drinking

  16. Thank you for listening Pieter Sas, Elke Knoops, Benjamin Maris and SerpilDirikan MounaTajeddine, Jonathan Wauthier and ChristopheLisbe

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