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Offsetting greenhouse gas emissions using charcoal

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August 11, 2010

Biochar – a charcoal created by pyrolysis could offset 12 percent of human greenhouse ga...

Biochar – a charcoal created by pyrolysis could offset 12 percent of human greenhouse gas emissions (Image: bdiscoe)

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According to a new study, as much as 12 percent of the world’s human-caused greenhouse gas emissions could be sustainably offset by producing biochar, a charcoal-like substance made from plants and other organic materials. That’s more than would be offset if the same plants and materials were burned to generate bioenergy, says the study. Additionally, biochar could improve food production in the world’s poorest regions as it increases soil fertility.

Biochar is made by decomposing biomass like plants, wood and other organic materials at high temperature in a process called slow pyrolysis – a form of incineration that decomposes organic materials by heat in the absence of oxygen. Normally, biomass breaks down and releases its carbon into the atmosphere within a decade or two. But biochar is more stable and can hold onto its carbon for hundreds or even thousands of years, keeping greenhouse gases like carbon dioxide out of the air longer.

Other biochar benefits include: improving soils by increasing their ability to retain water and nutrients; decreasing nitrous oxide and methane emissions from the soil into which it is tilled; and, during the slow pyrolysis process, producing some bio-based gas and oil that can offset emissions from fossil fuels.

The carbon-packed substance was first suggested as a way to counteract climate change in 1993. Scientists and policymakers have given it increasing attention in the past few years and this new study conducted by a collaborative team from the Department of Energy’s Pacific Northwest National Laboratory (PNNL), Swansea University, Cornell University, and the University of New South Wales, is the most thorough and comprehensive analysis to date on the global potential of biochar.

The study

For their study, the researchers looked to the world’s sources of biomass that aren’t already being used by humans as food. For example, they considered the world’s supply of corn leaves and stalks, rice husks, livestock manure and yard trimmings, to name a few. The researchers then calculated the carbon content of that biomass and how much of each source could realistically be used for biochar production.

With this information, they developed a mathematical model that could account for three possible scenarios. In one, the maximum possible amount of biochar was made by using all sustainably available biomass. Another scenario involved a minimal amount of biomass being converted into biochar, while the third offered a middle course. The maximum scenario required significant changes to the way the entire planet manages biomass, while the minimal scenario limited biochar production to using biomass residues and wastes that are readily available with few changes to current practices.

The researchers found that the maximum scenario could offset up to the equivalent of 1.8 petagrams – or 1.8 billion metric tons – of carbon emissions annually and a total of 130 billion metric tons throughout in the first 100 years. Avoided emissions include the greenhouse gases carbon dioxide, methane and nitrous oxide. The estimated annual maximum offset is 12 percent of the 15.4 billion metric tons of greenhouse gas emissions that human activity adds to the atmosphere each year. Researchers also calculated that the minimal scenario could sequester just under 1 billion metric tons annually and 65 billion metric tons during the same period.

Making biochar sustainably requires heating mostly residual biomass with modern technologies that recover energy created during biochar’s production and eliminate the emissions of methane and nitrous oxide, the study also noted.

Biochar and bioenergy

Instead of making biochar, biomass can also be burned to produce bioenergy from heat. Researchers found that burning the same amount of biomass used in their maximum biochar scenario would offset 107 billion metric tons of carbon emissions during the first century. The bioenergy offset, while substantial, was 23 metric tons less than the offset from biochar.

Researchers attributed this difference to a positive feedback from the addition of biochar to soils. By improving soil conditions, biochar increases plant growth and therefore creates more biomass for biochar productions. Adding biochar to soils can also decrease nitrous oxide and methane emissions that are naturally released from soil.

Left - a nutrient-poor oxisol; right - an oxisol transformed into fertile terra preta usin...

However, the researchers say a flexible approach including the production of biochar in some areas and bioenergy in others would create optimal greenhouse gas offsets. Their study showed that biochar would be most beneficial if it were tilled into the planet’s poorest soils, such as those in the tropics and the Southeastern United States.

Those soils, which have lost their ability to hold onto nutrients during thousands of years of weathering, would become more fertile with the extra water and nutrients the biochar would help retain. Richer soils would increase the crop and biomass growth – and future biochar sources – in those areas. Adding biochar to the most infertile cropland would offset greenhouse gases by 60 percent more than if bioenergy were made using the same amount of biomass from that location, the researchers found.

On the other hand, the authors wrote that bioenergy production could be better suited for areas that already have rich soils - such as the Midwest – and that also rely on coal for energy. Their analysis showed that bioenergy production on fertile soils would offset the greenhouse gas emissions of coal-fired power plants by 16 to 22 percent more than biochar in the same situation.

Overview showing inputs, process, outputs, applications and impacts on global climate (Ima...

Sustainability

The study also shows how sustainable practices can make the biochar that creates these offsets.

“The scientific community has been split on biochar,” says PNNL’s Jim Amonette. “Some think it’ll ruin biodiversity and require large biomass plantations. But our research shows that won’t be the case if the right approach is taken.”

The researchers’ estimates of avoided emissions were developed by assuming no agricultural or previously unmanaged lands will be converted for biomass crop production. Other sustainability criteria included leaving enough biomass residue on the soil to prevent erosion, not using crop residues currently eaten by livestock, not adding biochar made from treated building materials to agricultural soils and requiring that only modern pyrolysis technologies – those that fully recover energy released during the process and eliminate soot, methane and nitrous oxide emissions – be used for biochar production.

“Roughly half of biochar’s climate-mitigation potential is due to its carbon storage abilities,” Amonette said. “The rest depends on the efficient recovery of the energy created during pyrolysis and the positive feedback achieved when biochar is added to soil. All of these are needed for biochar to reach its full sustainable potential.”

The study, "Sustainable biochar to mitigate global climate change," appears in the journal Nature Communications.

About the Author
Darren Quick Darren's love of technology started in primary school with a Nintendo Game & Watch Donkey Kong (still functioning) and a Commodore VIC 20 computer (not still functioning). In high school he upgraded to a 286 PC, and he's been following Moore's law ever since. This love of technology continued through a number of university courses and crappy jobs until 2008, when his interests found a home at Gizmag.   All articles by Darren Quick
10 Comments

The most efficient modern technology for this conversion and for the treatment of all waste, including toxic, is manufactured in Germany. It is the most efficient and cost effective Pyrolisis Waste to Energy process to also produce charcoal and a singas for energy/heat etc. Induction heat is used, no oxygen is burned, therefore there are no fires burning or chimeneys, therefore no emmissions of any kind.

Plants can be delivered in 3 months which have a capacity of 5 Tons/day. Larger plants are scalable up to 500 tons in multiples of turbines of 25 Tons/day each.

rvgans
11th August, 2010 @ 07:49 am PDT

Seems like these plants would have to be portable to avoid all the emissions associated with collecting and dispersing the carbon char.

Lawrence Weisdorn
11th August, 2010 @ 09:05 am PDT

Sounds good. How expensive would a pyrolysis device be? I wonder if it could be powered by solar.

John Weiss
11th August, 2010 @ 11:38 am PDT

Well,the now defunct South American civilizations were doing it for thousands of years without the wheel,so it was done locally with barely more than bronze age technology.

gragraposker
11th August, 2010 @ 09:39 pm PDT

Hi, I would like to parcticipate doing research with this charcoal and other materials in order to improve soil fertility and get the these benefits in my ocuntry. If anybody know how I can get it, let me know.

Best whises

Patishtan Juan
12th August, 2010 @ 05:37 am PDT

Four research institutions turn grant money into a greenhouse gas by listing the known characteristics of charcoal, whoopee, this is so exciting. My new explitive BIOCHAR!

Dave B13
12th August, 2010 @ 06:14 am PDT

we are slowly moving to carbon offset pollution control unleaded fuel windturbines wave energy hope its not all to late

George Kat
12th August, 2010 @ 12:39 pm PDT

To answer John Weiis question. The plant costs between 2,5 and 3 million %u20AC

To answer Patishtan Jr: write to info@firstfalconteam.com for full details of the plant

rvgans
13th August, 2010 @ 07:57 am PDT

Dave B13, I always had my suspicions what happens to grant monies but now you confirm it! Institutions turn grant money into greenhouse gas and BIOCHAR! (charcoal) Now that our US government is churning out new money at a record pace, we will have plenty of fodder for more BIOCHAR!

Will, the tink
14th August, 2010 @ 06:58 pm PDT

Welcome friends

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Adam John
21st December, 2010 @ 02:02 am PST
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