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What is biogas?

Generación de biogás renovable

Renewable energies are not only wind, solar or hydroelectric. Among them we find some other more unknown ones such as biogas. Today we will talk about this source of renewable heat energy.

Among the renewable energies we find biogas, a great unknown and which consists of an alternative energy composed of carbon dioxide and methane. It is obtained from materials of organic origin and in an oxygen-free environment.

It comes largely from organic waste of animal or vegetable origin and is used as fuel for use in adapted vehicles.

Today, for example, we have propane, which has a relatively low calorific value, and there is also bio propane, which, unlike propane, is obtained from traditional renewable energy sources.

We also have butane gas, a gas that comes from non-renewable energy. Studies show that it can be channeled and more efficient, even though it comes from fossil energy sources. In addition, due to the evolution of prices and its low need for electricity supply, benefits can be obtained eventually, but not in the long term, as they are obtained with biogas.

What are the benefits of biogas?

They are mainly due to its origin. Biogas is characterized as one of the renewable energies that not only cooperates with the environment, but is also a way of recycling our organic waste. In other words, it is a biofuel that can reduce climate change because it does not emit sulfur dioxide, one of the main causes of acid rain. It also helps reduce energy dependence on fossil fuels.

It is also a great opportunity for rural areas, as it guarantees a decentralized supply of electricity or gas that is obtained from all the surrounding organic matter.

Another major advantage is that its production does not depend on the weather and it is a safe energy. Given the economic benefit, it should not be underestimated.

How to obtain it

Biogas is obtained by decomposing organic matter. In order to extract as much of the resulting gases as possible, it is necessary to have a biogas storage facility that allows the bacteria to pass through.

This can be done in specific biogas plants or directly in complexes that allow waste management. All floors have the same basic functions and share the same spaces. Whether larger or smaller:


It is the space where the biomass is stored and received, it is mainly composed of organic waste, just before its conversion. It is located in the substrate which is also called “feedstock space”. It can also be combined with different types of substrates, most plants only work with one type. Although this may change thanks to new research that studies the optimization of the waste mixture to obtain the most energy.

Fermenter or bio fermenter

At this point it goes from solid to gaseous. The substrate is placed in an opaque chamber without light or oxygen. The residue is kept in constant movement and at stable temperatures of around 40 ° C. The substrate is stored in the fermenter for about four months. Depending on the type of installation, we can also find some fermentation systems that are continuous or discontinuous so that the same amount of substrate can be extracted or added, in this way the daily production does not stop.


When the biogas production process is completed, on the one hand a by-product (digestate) is obtained, from which, on the other hand, organic fertilizers can be produced.

Energy producer

Depending on the type of cogeneration or thermoelectric system, the gas is either transported there or fed directly into the grid, and is also converted into electrical energy that can be used to operate the system or converted into thermal energy.

The result is the generation of fully renewable energy that can then be used to reduce dependence on fossil fuels and thus contribute to sustainable development goals.

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