Revision as of 10:48, 3 December 2015
Overview
There are different types of small scale biogas digesters. Some of the biogas digesters are summarized below:
The table below gives a first comparison of the different types.
| Factors
|
Fixed dome
|
Floating drum
|
Tubular design
|
Plastic containers
|
| Gas storage
|
Internal Gas storage up to 20 m³ (large)
|
Internal Gas storage drum size (small)
|
Internal eventually external plastic bags
|
Internal Gas storage drum sizes (small)
|
| Gas pressure
|
Between 60 and 120 mbar
|
Upto 20 mbar
|
Low, around 2 mbar
|
Low around 2mbar
|
| Skills of contractor
|
High; masonry, plumbing
|
High; masonry, plumbing, welding
|
Medium; plumbing
|
Low; plumbing
|
| Availability of Material
|
yes
|
yes
|
yes
|
yes
|
| Durability
|
Very high >20 years
|
High; drum is weakness
|
Medium; Depending on chosen liner
|
Medium
|
| Agitation
|
Self agitated by Biogas pressure
|
Manual steering
|
Not possible; plug flow type
|
Evtl Manual steering
|
| Sizing
|
6 to 124 m³ digester vol
|
Up to 20 m³
|
Combination possible
|
Up to 6 m³ digester vol
|
| Methane emission
|
High
|
Medium
|
Low
|
Medium
|
