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Long-term carbon sequestration through organic materials

RISE provides expert knowledge on life cykel analysis and calculation of carbon sequestration potential for long-life wooden buildings and biochar. Biochar provides a long-term carbon sink and the material can be used as soil improvement in agriculture and forest land, in light-weight material for roofs and walls but also as drainage material.

Biochar pellets
Photo: Tora Råberg
Biokolspellets

 

Industry and society face major challenges in the transformation to become fossil-free where renewable and recycled materials and products replace fossil fuels. Interest in timber based buildings has increased rapidly in Sweden and internationally. A lifespan of at least 100 years is often a  requirement in the planning process and in Sweden there are many examples of wooden buildings that are significantly older than that. The Government also intends to promote increased timber construction to reduce climate impact and vulnerability, through reliable raw material supply from several suppliers. The new requirement for a climate declaration for buildings aims at reducing the climate impact from construction and increasing reuse and recycling. Today, the modern wooden construction of multi-storey buildings in Sweden accounts for a market share of almost 15% and interest continues to grow. At present, residues from construction and demolition are often burned, although it could be pyrolyzed to achieve biochar that can be used as a carbon sink. RISE offers research collaboration to develop life cycle analyses that shed light on the possibility of increased sustainability through up-cycling to biochar from the residues of construction with timber. We also welcome assignments from companies that want to develop construction towards higher sustainability.

The use of biochar as a method for carbon storage is pointed out as the technology that has the greatest realistic potential to contribute to negative emissions in Sweden in the middle of this century according to the Swedish Government. Different raw materials store different amounts of carbon based on composition. Heartwood has a high carbon content, which gives a high carbon content in biochar after pyrolysis. Residual streams from sewage treatment plants or animal manure give a lower carbon content after pyrolysis, but give rise to long-term carbon sinks. Chip boilers used for district heating could be converted into pyrolysis boilers and if the biochar is used as a soil improvement, the process gives rise to negative emissions. RISE provides expertise in LCA for pyrolysis of various raw materials and calculation of carbon storage potential.

 

 

 

 

 

Tora Råberg

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Tora Råberg

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Tomas Nord

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Tomas Nord

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