anaerobic digestion benefits

8/2/2019 Anaerobic Digestion Benefits

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Anaerobic Digestion Benefits


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Benefits of Anaerobic Digestion

EnergyProduction

NutrientRecovery

CombatGlobal Warming

Pathogen Reduction

ConserveEnergy

Conserve Land

Reduce Odors

Manage Waste

Save the Earth!


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Global Warming and Biogas

As greenhouse gases fill our atmosphere ourclimate is beginning to change

Greenhouse gases such as CO2, CH4, andother gases are causing a global climatechange crisis

Methane is 21 times more powerful than CO2over a 100 year life cycle

Destruction of methane is a commodity


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Biogas and Global Warming

Carbon neutral energysource

Anaerobically digestedeffluent builds top soilan important carbonsink

Fertilizer grows plantmaterial anotherimportant carbon sink Plants fix Atmospheric

Carbon Dioxide


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Carbon Budget


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Anaerobic Digestion

Anaerobic

Digester

OrganicMatter

Fiber

Biogas

Biofertilizer


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Biofertilizer

Topsoil is supplemented withfertilizer to grow crops

Phosphorous mining is one ofthe most environmentallyharmful practices in FL

Nitrogen fixed with the Haber-Bosch process consumes 1%of the world's energy supply

Soil Profilehttp://www.sciencemag.org/cgi/content/full/297/5587/1654


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Biofertilizer

Anaerobic Digestionremoves Carbon infeedstock leaving avaluable, nutrientrich effluent

Nutrients are

mineralized to asoluble, bioavailableform

Digester Effluent in theDeveloping World


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Eutrophication

Nutrient overloading can cause ecologicalcollapse by creating aquatic areas with littleor no oxygen, dead zones

Nutrients cause an algal bloom which leadsto a die off

Agriculture and urban runoff containingchemical fertilizers are largely responsible


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Biofertilizer

Eutrophication by nutrientsis a major environmentalproblem

Effluent contains fiber tomitigating erosion andaiding nutrient management

Anaerobic Digestion buildssoil up through the naturalsoil building process

Eutrophication in theGulf of Mexico


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Biogas

Flared off

Direct Combustion

Electricity production

Compressed Natural Gas Vehicles

Fuel cell


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Honda's CNG Vehicle

Biogas Fueled?


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Combustion

Water heaters

Steam generation

Electricity productionfrom Internal

Combustion,microturbineGas Flare


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Pathogen Reduction

The anaerobicmicrobial communitycan select for non-pathogenic microbes

Studies have shownthat anaerobic

digestion of manurewastes is an effectiveway of reducingpathogensE. Coli


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Land Conservation

Small Facility Print

Prevents waste fromgoing into Landfills

Removes need forlarge Aeration plants

m

UF/IFAS Anaerobic Digester


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Landfill Gas vs Biogas

Similar process occursin a landfill

Issues: Biogas quality,Nutrient recovery, Landuse, Methane potential

Anaerobic Digestion invessel provides manyadditional benefits over

Landfills


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Questions?

anaerobic digestion benefits

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