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  • Anaerobic Digestion: A Sustainable Technology

    Ann C. Wilkie Soil and Water Science Department

    University of Florida-IFAS acwilkie@ufl.edu

    2013 BioEnergy Symposium IDEAS Center, UNC Charlotte

    April 9, 2013

  • Natural Resources

    Waste

    Greenhouse Gases

    Biodiversity

    Energy Human Health

    Water

    The Dimensions of Sustainability

    Community

  • Electrical and/or thermal energy

    Biofertilizer

    Organic wastes Anaerobic

    digestion Biogas

    Solar energy

    Animal husbandry

    Biofuel production

    Crop harvesting

    Industrial processing

    Human consumption

    Photosynthesis

    H2O CO2

    Biogas Cycle

    Energy crops

    Natural gas pipeline

  • Methanogenesis

    Complex Organic Carbon

    Monomers & Oligomers

    Organic Acids

    Acetate – H2 / CO2

    CH4 + CO2

    Hydrolysis

    Acidogenesis

    Acetogenesis

    Anaerobic Digestion

  • Methanogens

  • Biofilm

  • BIOGAS PLANT

    CORE TECHNOLOGY

  • Feedstocks • Animal manures • Agro-Industrial wastewaters • Municipal wastewaters • Municipal solid wastes • Biofuels by-products • Energy crops / crop residues

  • Benefits of Anaerobic Digestion • Renewable energy • BOD/COD reduction • Odor reduction • Pathogen reduction • Nutrient conservation • Greenhouse gas reduction

  • ANAEROBIC vs AEROBIC PROCESSES

    • Loadings not restricted by rate of oxygen transfer

    • Not restricted by high cost of oxygen transfer • Usable end product in the form of methane gas • Less biological solids production per pound of

    BODR • Less land area required due to smaller

    footprint

  • GLOBAL TECHNOLOGY

    • Tolerant – varied feedstock capability

    • Scalable – custom sizing

    • Flexible – rapid restart after seasonal idling

    • Universal – worldwide application

  • National Biodigester Programme Cambodia (July 2010)

  • Biodigestion in Honduras (September 2012)

  • Anaerobic digesters

  • Where is the flame the brightest?

  • • Food waste represents a significant component of the municipal waste stream.

    • Most of this food waste is hauled to landfills.

    • A practical alternative is to use food waste as a feedstock for anaerobic digestion to produce energy in the form of biogas.

  • Current open-loop food-waste-to-landfill system

  • FERMENTATION

    DISTILLATION

    BIOGAS

    STILLAGE

    ANAEROBIC DIGESTION

    BIOETHANOL

  • TRANSESTERIFICATION

    PRESS CAKE

    BIODIESEL

    Oil pressing

    CRUDE GLYCEROL

    Washing

    WASTE OIL

    VIRGIN OIL

    CRUDE BIODIESEL

    WASHWATER

    METHANOL + KOH

    Anaerobic Digestion

    BIOGAS

    OIL CROPS ALGAE

  • CLOSED LOOP

    DAIRY / FEEDLOT BIOETHANOL PLANT

    ANAEROBIC DIGESTER

    MANURE BIOGAS

    FEED

    STILLAGE

    Co-location Synergies

  • WATER

    SUNLIGHT

    Energy Crops

    Biogas Plant

    Biofertilizer

    CO2

    CO2 WATER

    Methane

    Green Grass to Green Gas

  • Crops for Biogas

  • BIOGAS and ALGAE

    • Nutrient-rich effluent from biogas production can be used for mass cultivation of algae

    • CO2 supplied from biogas combustion promotes algal growth.

  • Feedstock for Anaerobic Digesters

    • Increase gas production

    • Increase electricity generation

    • Facilitate co-digestion by capturing imported nutrients

    Opportunities for Algae

  • Municipal Wastewater Treatment

    • Today: Aerobic + Anaerobic

    • Future: Anaerobic + Aerobic

  • Building capacity for the future

  • Anaerobic Digestion: A Sustainable Technology

    Ann C. Wilkie Soil and Water Science Department

    University of Florida-IFAS acwilkie@ufl.edu

    2013 BioEnergy Symposium IDEAS Center, UNC Charlotte

    April 9, 2013

    Anaerobic Digestion: �A Sustainable Technology Slide Number 2 The Dimensions of Sustainability Slide Number 4 Slide Number 5 Slide Number 6 Slide Number 7 Slide Number 8 Feedstocks Benefits of Anaerobic Digestion Slide Number 11 ANAEROBIC vs AEROBIC PROCESSES GLOBAL TECHNOLOGY Slide Number 14 Slide Number 15 Anaerobic digesters Where is the flame the brightest? Slide Number 18 Slide Number 19 Slide Number 20 Slide Number 21 Slide Number 22 Slide Number 23 Slide Number 24 BIOGAS and ALGAE Feedstock for Anaerobic Digesters Municipal Wastewater Treatment Slide Number 28 Anaerobic Digestion: �A Sustainable Technology

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