Soil improver from residues of olive oil production

Residues from the olive oil production.
Residues from the olive oil production.

In the project En-X-Olive funded by the European Union (grant agreement no 2184442-2) we researched together with partners from Spain, Italy, Greece and France the recovery of biogas, polyphenols, and fertilizers from residues of olive oil production. The objective of the work package fertilizer recovery was to produce a compact organic soil improver from the digested residues of the olive oil mill industry. The digested residues were separated into their solid and liquid fractions and the solid fraction was dried and pelletized. The product was a competitive commercial fertilizer that could be stabilized, stored, transported and spread with common fertilizer spreaders used in agriculture.