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Biogas. A presentation for the Comenius project meeting in Calaf 2013. Historical facts. around 3000 b.Ch.: beginning of unconscious use of microorganisms 1859: discovery of microbial development of methane first biogas plant in Bombay, India around 1900:

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Presentation Transcript
slide1

Biogas

A presentationforthe

Comenius project

meetingin Calaf 2013

slide2

Historical facts

  • around 3000 b.Ch.:
  • beginning of unconscious use of microorganisms
  • 1859:
  • discovery of microbial development of methane
  • first biogas plant in Bombay, India
  • around 1900:
  • first communal biological sewage plants in big cities
slide3

early 1950s:

  • one short peak in agricultural sector in Germany
  • about 50 biogas plants
  • mid 1950s:
  • heating oil became cheaper ► drop of request for biogas
  • 1970:
  • worldwide energy crisis
  • financial support for scientific research in biogas ►rise of request for biogas & later on: drop
slide4

1980:

  • about 100 biogas plants in Germany
  • 2012:
  • about 7500 biogas plants ►3400 MW for German electricity supply system
  • 6% of the German electricity production
slide11

Phasesofthefoulingprocess

Reduction of organic substances

organicacid, carbondioxide,

hydrogen sulfideandammonia

acetate, carbondioxideand hydrogen

methane, carbondioxidandwater

slide12

Methanogenic condition

Methane coccus

+

Methane bacterium

hydrogen

carbon

dioxide

methane

slide13

Terms ofbiogasproduction

consistent temperature

air exclusion

light closure

wetness

consistent feeding with substrate

slide14

Efficiency ofbiogasplants

  •  normal < 19% 
  • refit a digestatestorage  36%
  • 46%  energy  in digestate
slide15

Disadvantage of biogas

  • higher lease pricefortheusedspaceofthefarmers
  • dangerofexplosions, suffocationorpoisoning
  • toxic hydrogen sulfide in gas
  • high safetyregulations
  • methaneproduces per mass 25 timeshigher
  • greenhouseeffectthancarbondioxide
  • maizemonoculturehas negative influence on wildlife
slide16

Thank you for your attention

Comenius-Gymnasium Datteln 2013