Calculation of feeding ratio for 1000 liter biogas digester

To my understanding 1000 liter/40 = 25 liter. So it is advisable to feed 25 liter of food waste mixed with water. It means, your food waste is already included in that 25 liter. I have read from this elsewhere, the maximum ratio of food waste to water you can apply is 1:1 (though to me its too much for the microbes to handle). Roughly the maximum weight of food waste you can put is 12.5 kg in which you add another half of water to add up to 25 liter as total mixed. However its up to you what level of total solids you want to practice by reducing the food waste within that 25 liter. The more effluent you take out from the digester, the more bacteria you will discard and that may affect whole digestion process and becoming slower in producing gas.

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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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Inoculum preparation for biogas generation

The most cheapest and easiest way to produce an inoculum is using digestate from working biogas digester. They are consist of active culture with stable activity because consist of varieties of microbes working together or consortium.

Next source is by taking a scoop of slurry or sediment from anaerobic pond. These are also active microbes we can used directly to produce biogas.

If you happen to live nearby cattle farm, dung is another source of microbes that can produce biogas.But to start with cow dung we need to mix it with water and ferment until it mature in which produces biogas.

Do not mistaken biogas with carbon dioxide. Biogas is flammable while CO2 is not.

So to produce biogas you can start with things that already around you.

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