Biogas from anaerobic digestion Biogas potential

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Biogas from anaerobic digestionBiogas potential
digester

• By Jin Mi Triolo S. G. Sommer
• University of Southern Denmark

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Biogas knowledge pyramide
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The world markets for biogas

• European biogas sector
• - thousands of biogas
  installations,
• - Germany, Austria, Denmark and
  Sweden
• the technical forerunners with
  the largest number of modern biogas
  plants)
• Asia
• -Small-scale biogas plants
• -Simple technologies, and
  therefore cheap to construct
• Vietnam
• - 200 thousand rural household biogas digester
  
• China
• - 30 million rural household biogas
  digesters
• India
• - 5 million

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Biogas production in Europe
50
of landfill methane
is produced in UK
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Global potential of biogas production

• Very small part of this potential is utilized
  today
• European Biomass Association (AEBIOM)
• The largest potential lies in biomass originating
  from agriculture.
• Up to 20 to 40 million hectares (Mha) of land can
  be used for energy production in the European
  Union alone, without affecting the European food
  supply.

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Family scale biogas plants (very small scale)

• Nepal, China or India operate millions of family
  scale biogas plants
• Utilizing very simple technologies.
• Feedstock the household and/or their small
  farming activity
• Biogas is used for the family cooking and
  lighting needs.
• no process heating (psychrophilic or mesophilic
  operation temperatures)long HRT.

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Rural biogas reactor types

• a) Chinese type
  b) Indian type
• 
  
  (ANGELIDAKI 2004)

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Run the digester

• Construct the digester, no leaks
• Fill it ca. half with biomass from another or
  with sludge from bottom of ponds (short time in
  air no oxygen)
• Add slurry daily 1/30 of the volume of the
  digester (Hydraulic retention time), if
  temperature is low.

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Large Biogas plants

• Horizontal digester, built in Denmark
• (Nordisk Folkecenter 2001)

Vertical digester in Germany (KRIEG AND
FISHER 2008)
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Large biogas plants
Picture of farm scale biogas plant
in Denmark co-digesting animal
slurries and energy crops

(GROENGAS A/S)
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Very lager and Centralised co-digestion plants

• Digesting animal manure and slurries, collected
  from several farms
• Centrally located in the manure collection area.
• Co-digest animal manure with a variety of other
  suitable co-substrates (e.g. food- and fish
  industries)
• Largely applied in Denmark
• size from 550 m3 to 8500 m3 treat1.2 million
  tons of animal slurry every year with 325.000
  tons of other kinds of organic waste (Vietnamese
  digester 10 m3)
• HRT 12-25 days
• Controlled sanitation process

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Centralised co-digestion plants

• Schematic representation of the closed cycle of
  centralised anaerobic digestion
• 
  
  (AL SEADI
  2001)

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Centralised co-digestion plants

• Centralised co-digestion plant in Denmark (LEMVIG
  BIOGAS)