Kosfeld Fenna Thesis - Flipbook - Page 65
Sources of Feedstock
Near Cal Negre in El Prat, there is a wood and cardboard recycling
station. The private company stacks Euro pallets to be rented and
picked up by suppliers and transporters.
Besides stacking the Euro pallets, they also accumulate and recycle
mixed wood residues.
Materials in scrap were made of pine, 昀椀r, oak, birch and other woody
composites, including glued material. Unfortunately, I never met the
people in charge of the company, so I did not get more information
about the circularity and broader way of operating. Nevertheless,
and potential material composites.
At Cal Negre, there is a big 昀椀eld that starts to bloom from March
onwards. The dead and dry grass and wheat underneath new plants
are supposedly good for the soil, as they should decompose and feed
the soil with microorganisms. However, as the soil in Cal Negre and
its surroundings can get very dry even in winter, most grass and
dead micro wood don’t dissolve nor directly nurture the soil.
They are a hazard for wild昀椀res as they are dry and highly combustible.
The large equivalent would be urban garden waste.
At Cal Negre, there are two horses who live most days on the 昀椀eld.
They eat all the surrounding grass. Due to the hot climate, the horsepoo dries mostly within two days. Because it is digested cellulose,
it is already a material composite compared to the grass and woody
feedstock. Its structure is very interwoven but loose and fragile.
The largescale equivalent would be comparable to the dung of herbivores that could be collected from farms.
Not local to Cal Negre, but a waste residue from a local butcher. I
collected leftover cattle bones to pyrolise and work with. The food
and agricultural industry produces up to “130 billion kilograms per
annum” (Hussain) of animal bone waste just in the EU.
Moreover, I have found studies using bone waste biochar as a fertilising component, as it has a higher porosity than the woody feedstock.
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