17
25
10
15
50
20
30
75cm
30cm
45cm
15cm
1m
2m
3m
HomeBiogas 2.0 :
4.0 :
7.0 :
50 x 105 x 50cm
100 x 210 x 100cm
150 x 315 x 150cm
HomeBiogas 2.0 :
4.0 :
7.0 :
HomeBiogas 2.0 4.0 7.0
60°
10-15mmø
50mm/2” ø
ø
Drainfields/Mulch basins must be sized appropriately for the expected usage/effluent output of the digester:
HomeBiogas 4.0 and 7.0 systems will require larger drainfields/mulch basins.
The following drainfield dimensions are sized for these general usage requirements:
HomeBiogas 2.0 -
25 flushes per day
/ 4.0 -
50 flushes
/ 7.0 -
75 flushes
Constructing a Drainfield or Mulch Basin
Parts & Tools:
Drainfield
• 2”ø PVC piping, fittings and connectors
• large gravel (1-2” diameter)
HomeBiogas 2.0 -
180 liter
/ 4.0 -
240 liter
/ 7.0 -
360 liter
• fine gravel (0.25-0.75” diameter)
HomeBiogas 2.0 -
25 liter
/ 4.0 -
50 liter
/ 7.0 -
75 liter
• shovel
• power drill & 10-15mm bit
1. Measure and prepare piping of the correct length required to connect the system’s fertilizer outlet to the
drainfield location.
2. Prepare perforated 2”ø distribution pipe (HomeBiogas 2.0 -
1m
/ 4.0 -
2m
/ 7.0 -
3m
).
Drill two rows of holes in a 60-degree arc, at roughly 15cm intervals along the 2” pipe.
3. Measure out and dig the drainfield pit in the chosen location, according to the required dimensions for your
HomeBiogas system model.
Fill the pit with the first layer of large gravel. Install the 2” distribution pipe on top of the large gravel layer with
holes facing downwards, and then place more large gravel around the pipe.
Add a layer of fine gravel to the pit. Cover and fill up the rest of the pit with a final layer of soil/compost.
compost/soil
fine gravel
large gravel
