Transcript Biogas from anaerobic digestion Biogas potential & digester

Biogas from anaerobic digestion
Biogas potential & digester
By Jin Mi Triolo & S. G. Sommer
University of Southern Denmark
Biogas knowledge pyramide
Optimizing
operational
condition& designing
biogas system
Methane productivity&
potential, reaction, inhibition
operational condition,
digetibility
Identification of biogas field in general
Obtaining technical ability to obtain data
to support project
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
Biogas production in Europe
3500
Methane production,
landfill & anaerobic digestion
Biogas, KtOE
3000
2500
Landfill
Landfill
2000
1500
Biogas sludge
Biogas sludge
Biogas other
Biogas other
1000
500
0
2004
2005
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.
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.
Rural biogas reactor types
a) Chinese type
b) Indian type
(ANGELIDAKI 2004)
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.
Large Biogas plants
Horizontal digester, built in Denmark
(Nordisk Folkecenter 2001)
Vertical digester in Germany
(KRIEG AND FISHER 2008)
Large biogas plants
Picture of farm scale biogas plant in Denmark
co-digesting animal slurries and energy crops
(GROENGAS A/S)
Very lager and Centralised codigestion 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 cosubstrates (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
Centralised co-digestion plants
Schematic representation of the closed cycle of centralised anaerobic digestion
(AL SEADI 2001)
Centralised co-digestion plants
Centralised co-digestion plant in Denmark (LEMVIG BIOGAS)