Agricultural residues

How agricultural residues are dealt with today: A waste of heating resources!

The agricultural sector creates a number of organic residues, including straw and seed and grain crop residues. In total, this amounts to about 1.5 million tonnes each year, corresponding to 6 TWh. Today, this material is composted, left to decompose directly on arable land, or incinerated for the purpose of producing bioenergy.

Why make biochar from agricultural residues?

Agricultural residues contain all the plant nutrients that the crops have absorbed. If we return them to the agricultural land, the cycles of nutrients can be closed and the need for fertilisers reduced. This is particularly relevant with regard to phosphorus, as the availability of phosphorus is limited today. In the conversion of organic residues to biochar, a high proportion of the nutrients, including phosphorus, is retained, while at the same time achieving energy recovery and creating a carbon sink.

WHAT WE DO IN THE PROJECT REST TILL BÄST

Within Rest till Bäst, we will primarily use seed crop residues from a range of agricultural residues to produce biochar. The goal is to optimise the pyrolysis process so that the costs and energy consumption are kept as low as possible while the energy extraction in the form of district heating remains as high as possible. We will also experiment with combining seed crop residues with other types of organic materials (such as sludge and algae) to see how it affects the pyrolysis process.

COMMITTED PROJECT PARTNERS

CONTACT

Markus Paulsson
markus.paulsson@lund.se
+46 (0) 46-359 53 36
City of Lund, City Office
221 00 Lund, Sweden

REST TILL BÄST

Rest till Bäst is a Vinnova-funded project whose purpose is to develop solutions for managing society’s organic residues and create a much needed beneficial product, while at the same time minimising environmental and climate impact.