Design and construction of mini biogas digester for family use

The biogas digester is composed of a green house made with hollow sunlight sheet and metal supporting frame, a membrane digester with a gas storage bag combined in one, a stainless steel sink, a stainless steel outlet, a biogas filter and a biogas booster pump:

1. Biogas production of 2m3/day is good enough for a family

2. It is a DIY kit small scale biogas system for convenient transport and easy assembly.

3. It is surface mounted, there is no need for digging or heavy construction.

4. It can be assembled within 2 hours by anyone with manual and video guidance.

5. Treated organic waste locally, use biogas for cooking, electricity or feed garden with nutritious liquid fertilizer.

6. Used for family, farm, restaurant, hotel, resort to treat organic waste, such as food waste, sewage sludge, animal waste.

7. Light weight and easy to install, packed in carton box.

8. Life span more than 10 years - made of stainless steel frame

9. Raw material of green house and PVC biogas storage bag

10. Specification 156*120*195cm

11. Methane Content 65% which is excellent for cooking

 

 

Construction video:

 

 

 

 More info:

DIY kit assemble mini biogas digester for family use

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Construction of 45 liter biogas biodigester for beginner

To construct a simple biogas digester in the photo above is easy. The materials you need are readily available at any hardware store near your residential area.

Basically the system consist of:

1. Inoculum
2. Biogas biodigester
3. Biogas storage
4. Connection between biodigester and its biogas storage

Inoculum
Inoculum is a starter for the anerobic fermentation process to begin. It consist of consortium of microbes to help in digesting suitable raw material and able to turn them into biogas and effluent that is more environment friendly within a short period of time compared to conventional aerobic composting.

Biodigester

What is a biodigester? The function is to contain the fermentation process of food waste occurred in an aerobic condition without any oxygen.

Biogas storage
Used tyre tube to contain and store biogas produced from the fermentation.

Connector
A silicon clear host to connect gas produced from biodigester to the storage bag.

Other accessories and materials needed
PVC pipe, silicon gel, plastic and metal valve, etc.

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Construction of a Hestia biogas digester

A general rule is that the tank needs to be 50 times the size of the daily input to allow for some space for gas to collect. If your input is 15 gallons of material per day, you’d need a 750-gallon tank.

Hestia biodigesters are approximately 5 by 7 feet wide by 5 feet deep, providing about 700 gallons of capacity. Slurry occupies about 600 gallons of this biodigester; the remaining space is for the gas that’s produced.

There’s an inlet for adding feedstock and an outlet for removing composted slurry.

A closed loop of PEX tubing in the bottom of the tank is plumbed to an on-demand water heater to add heat when the slurry temperature drops below 50°F—the temperature at which cryophilic methanogenic bacteria go dormant and stop producing gas.

If the climate is mild, it may be enough to build a hoop house over the tank to keep the slurry sufficiently warm in winter. Alternatively, the biodigester could be allowed to go dormant during the colder months.

More info: http://energez.blogspot.com/2012/04/video-hestia-home-biogas-plant.html

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