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Address:

Hoidla tee 15 75302 Vaida Harjumaa
Telephones:

+372 51 03 495

+372 53 31 1110

Fax:

+372 670 0147

E-mail:

kalle@biogt.ee
madis@biogt.ee

Biogas production technology

Biogas forms during the organic decomposition process, where biomaterial is 
broken down in the absence of oxygen. Biogas mainly consists of carbon 
dioxide and methane and is almost identical to the natural gas pumped out 
of the ground by the oil companies by its features. Biogas can be produced 
from organic wastes of agriculture, industries and households, but also 
specially grown energy plants like grass and corn silo. Biogas is used to 
produce heat, electricity, vehicle fuel etc.
Biogas is produced in airtight tank where the steady temperature is kept. 
The tank is filled with organic waste, which is converted to gas by bacteria. 
The correct feeding of the reactor is important for consistent gas production. 
During the biogas production process the nourishments are preserved and 
become easier to adopt, this makes the digested slurry and dregs more 
valuable fertilizer than the raw manure.

Cattle manure is suitable raw material for producing biogas. During the 
process, the amount of effective nourishments is increased and the spreading 
out features are improved. At the same time, the bacteria that cause animal 
and plant diseases and weed seeds are destroyed. The pig manure deodorizes 
significantly.
 
Gas production can be made more efficient by adding in reactor energy-plants 
or organic waste. Fermentation gets more energy out of the plants than other 
technologies and at the same time, it allows to save on the fertilization.
 

Hectare yields of traffic biofuels (FNR 2006)

Biofuel

Fuel equivalence

(l/ha per year)

Rapeseed oil

1420

Biodiesel

1410

Ethanol

1660

Fischer-Trops

3910

Biogas

4980

 
biogaasiautod.jpg
Many vehicles producers have also varoius biogas vehicles in their product range.
 
 

Biogas and energy yields of various raw materials per ton

Material

Electricity kWh(CHP)

Heat kWh(CHP)

Fuel equivalence (Transport)

Cattle slurry

Pig slurry

50 - 55

55 - 65

75 - 90

90 -100

14 - 16

16 -18

Fish waste

330 - 370

520 -580

95 - 105

Potato peelings

280 - 350

440 - 550

80 - 100

Household biowaste

350 - 525

550 - 825

100 - 150

Energy plants

350 - 525

550 - 825

100 - 150

Bakery waste

Baking fats

1400 - 1470

1750 - 1925

2200 - 2310

2750 - 3025

400 - 420

500 - 550

 
www.metener.fi
www.biokaasufoorumi.fi

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