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Different types of biogas systems

Different types of biogas systems

In our three part series we have examined the use of biogas to reduce emissions and drawdown carbon as a tool to address climate change. We looked at some of the factors that make biogas suitable and some of the limitations that might make biogas less than optimal for a specific location or application in the first article, and biogas through the lens of the permaculture principles in the second article.

In this last article, we will examine some of the types of small scale biogas, and what applications they may be useful for. Included are links to the systems location and service or equipment providers.

There are three main kind of biogas digesters
1) Buried or sealed vault, popular in China, fairly expensive, requires skills to make, and takes time, but if built properly will last forever. These are primarily for animal based systems, especially pig and cattle manure.

2) Tank system, which functions like a vault, except the anaerobic conditions are created by the use of a sealed container of some kind. Water tanks and second hand Industrial Bulk Containers (IBC’s) are used for this. These are primarily food waste systems

3) Bag systems, which are very easy to make, very inexpensive, but relatively fragile (though there are exceptions to that, such as the Sistema Biobolsa, covered below). These are primarily animal waste systems.

4) Floating gas systems, which are easiest to make, but some have issues of a percentage of methane escaping to the atmosphere, which is counter productive to reduce the effects of climate change. Methane is much more powerful as a green house gas than carbon dioxide. Floating gas systems can be for food waste or for animal based systems, depending on size.

…click on the above link to read the rest of the article…


Connor Stedman: Carbon Farming

Connor Stedman: Carbon Farming

Sequestering atmospheric carbon through natural means

Climate change remains a hotly debated topic. But a scientific fact not up for dispute is the pronounced spike in the concentration of carbon dioxide in the Earth’s atmosphere over the past two centuries.

There’s a building urgency to find solutions that can manage/reverse that spike — a process known as carbon sequestration. But how to do that on a planetary scale? It’s a massive predicament. And most of the ‘solutions’ being proposed are technologically unproven, prohibitively costly and/or completely impractical.

Enter carbon farming. It uses nature-based farming practices to park gigatons of carbon in the soil, rebuild soil health and complexity, and revitalize the nutrient density of the foods that we eat. It is quite likely the only practical — and best — way to sequester carbon at massive scale, as well as reap a multitude of by-product benefits.

In this week’s podcast, field ecologist and agriforestry specialist Connor Stedman explains the science behind the carbon farming process:

For the last few million years of the Earth’s history, when there’s been this cycle of glaciers advancing and receding in the northern hemisphere, the concentration of carbon dioxide in the atmosphere has gone between about 180 parts per million and 280 parts per million. That is the band in which all of human history has happened, up until the last 200 or 300 years.

Now the concentration of carbon dioxide is about 407 parts per million, almost 50% higher than the upper end of that historical normal. Carbon dioxide is one of a number of greenhouse gases that hold heat in the Earth’s atmosphere, rather than it being fully reflected back out into space

…click on the above link to read the rest of the article…

Olduvai IV: Courage
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Olduvai II: Exodus
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