How are i managed? oil waste? There are several patents for the recycling and disposal of oil waste, however, many of these are too expensive for most mills.
To produce an olive oil with a good phenolic profile, milling with hammer crushers is the ideal process. The hammer crusher, compared to other methods of oil extraction, limits the breaking of the olive seed integuments and consequently avoids the release of peroxidase, an enzyme contained in the stone and which determines the oxidation of phenolic substances. The millers, just as they do not neglect the quality and phenolic profile of the oil produced, cannot neglect the management of oil waste.
The high quantity of oil waste generated in a short period of the year, makes theirs necessary disposal quickly, economically and sustainably. In Italy, the most popular techniques for the disposal of oil waste are directly linked to agriculture: it is very common spreading direct in the field of vegetation water and so-called “wet pomace” and the treatment of vegetation water in local purification systems.
Spreading in the field is made possible and governed by Law 574/96 and subsequent transpositions at the regional level which provide for up to a maximum of 50 or 80 m3 ha-1 relative to the waste produced respectively by traditional pressure crushers or by modern cycle mills. continuous.
For it disposal of oil waste through this practice it is necessary to have a soil with suitable characteristics (for example, the spreading of oil waste is forbidden in land not used for agricultural use, in woods, in land with horticultural crops in place, in land less than 200 meters from inhabited centers)
Still in the agronomic field, i oil waste, after having undergone biological treatment, they can be used as fertilizers in the fields to bring organic matter and nutrients to the soil. Composting oil waste is among the most eco-compatible and economically sustainable disposal technologies.
With the composting, i oil waste undergo the stabilization of the organic substance through intense microbial activity and strong aerobic degradation, typical phases of composting. The resulting material, called compost, can be compared to classic mineral fertilizers for the similar results obtained in the field of soil fertility.
How compost or peat is produced from oil waste? The process is the classic of composting where to trigger microbial activity it is necessary to expertly mix the wet organic component with the dry one. Similarly, at the exit from the mill, the oil wastewater (previously pitted) is mixed with other dry organic matter that works with a natural additive, we are talking about straw, wool waste, sawdust, leaves and twigs (waste material from the cultivation of the same olives).
Other methods for the disposal of oil waste they deviate from the agricultural sector. For the enhancement of oil waste their disposal for the formulation of functional foods and for the bioenergy production (biogas).