The solid waste (the sansa) is normally commected here in Italy and
the small amount of residual oil extracted but in other countries where the
volime does not justify the collection and second extraction it was used as
animal feed. Provided it is mixed with other feedstuffs (sheep and cattle
cannot digest large amounts of fat) it provides a valuable source of
energy.
Unfortunately many countries such as Tunisia where it was fed to
sheep mixed with barley have decided to "modernise" their animal feeding
with aid from France and the EU. The new factories produce pellets for
sheep, cattle etc. but are not able to use olive waste.

The process that is rapidly taking over in Italy is the two and
half phase centrifuge. Like the three phase it separates into oil, water
and sansa but some of the watery residue is recycled. Flavour is better
than the three phase. The volume of the watery residue is reduced as no
water is added.

Cheers Brian Chatterton.