1. Agricultural fermentation gas = Biogas.

Certain bacteria decompose liquid manure and no wood containing plants

(Anaerobic fermenting) to methane, CO2 and small quantities in sulphur hydrogen and ammonia.

This mixture is called fermentation gas. To 65% the methane containing fermentation gas is well usable as an energy source.

The heat value lies with about 6kwh / m ³ and the energy value of 1 m ³ fermentation gas corresponds to about 0.6 liter fuel oil or 0, 6 m ³ natural gas.

In an agriculturally used fermentation gas arrangement, for example, liquid manure is collected by pigs, cows and also hens first of all stored in a heatable pre-pit and then, fermenting green cut or ground grain is added. This warmed and chopped up mixture is pumped at regular intervals to the fermenting container.

Now the fermentation gas originates under the air collector unit and with the help of bacteria anaerobic fermenting begins.

This process works the best between 30 to 40°C, so the container must be heated.

The fermentation gas gained can be burnt in boilers or gas engines inside of a biogas plant.

A part of the generated energy is used for the powering of the whole process. With the electricity – heat, a combined heat and power unit plant by means of a CHP, not only heat but electric energy as well is generated.

I will talk about the subject of CHP shortly, here, separately.

20-50% of the won heat from the engine or boiler and exhaust gas serves the necessary heating of the pre-pit and the fermenting container. The generated energy can be fed (each country can be different) into the public net against reimbursement with the deduction of the personal use.

Then the rest materials could be brought back as a high-quality fertilizer to the agricultural circulation.

Watch the video below to understand the “BioGasSystem”.

2. Garbage dump gas:<(span>

In garbage dumps a methane-containing gas forms, just like the fermentation gas. The microbes necessary for the decomposition exist everywhere and their number increases greatly with favorable conditions.

To the collection of the dump gases drillings are introduced in the dump. Gas is collected and used just like the fermentation gas

4. Sewage gas

Biological sewage treatment plants also originate ignitable gases.

With the cleaning of the sewage the held back materials are decomposed by bacteria.

End product is a fermenting sludge and sewage gases. The methane gas usability lies between 35% and 50%, 1 m ³ gas with 40% methane contains about 4 kW energy.

The utilization of the gas is similar to fermentation gas and dump gas. In the sewage arrangements the originating energy is used to cover their own energy consumption. Thus none or very little energy must be acquired from the outside sources.

If you do not understand anything, please leave a comment and I will reanswer you.