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Biogas Digester

Biogas Digester . Jeff Rohrer APES March 19, 2012. How it works?. Anaerobic digestion- absence of oxygen, aka fermentation Organic waste is put in a air tight chamber to keep oxygen from entering Plant, animal and fecal matter typical Methane, Carbon dioxide, Hydrogen sulphide formed.

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Biogas Digester

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  1. Biogas Digester Jeff Rohrer APES March 19, 2012

  2. How it works? • Anaerobic digestion- absence of oxygen, aka fermentation • Organic waste is put in a air tight chamber to keep oxygen from entering • Plant, animal and fecal matter typical • Methane, Carbon dioxide, Hydrogen sulphide formed

  3. Advantages/Disadvantages • Lessen global climate change • NO2 changes into CO2 310 less effect on climate • Reduces waste • Rural creation of reusable energy, higher S of L • Saves money, resources • Not as clean as natural gas • Methane has greater effect on climate change • Contamitive gases can hurt engines • Limited production, not controllable

  4. Environmental Impacts • Methane is 20 times more potent of a GHG than CO2 • Release VOCs contributing to photochemical smog • Methane CH450–75, Carbon dioxide CO225–50, Nitrogen N20–10, Hydrogen H2 ,0–1 Hydrogen sulfide H2S 0–3 ,Oxygen O20–0

  5. Where it is used? What does it replace? • Typically used for cooking, electricity generation and heating • Can be cleaned and brought up to natural gas standards when it becomes biomethane • Can replace up to 17% of vehicle fuel • Used all over the world, especially in rural farming areas such as Germany (largest producer) • Small scale digesters, USA (1% of natural gas use), UK, China

  6. Future • Biogas transportation • Biogas train in Sweden since 2006 • Biogas buses used in Europe • Matter is compressed and used in transportation • Injection into the natural gas grid

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