II.2.1.5 Settling

Definition :

Separation, before fermentation, of the more or less clear liquid from the solid matter suspended in the must.

Objectives :

a)        To eliminate soil particles.

b)       To eliminate organic particles so as to reduce phenoloxidase activity.

c)        To reduce the indigenous microbial flora.

d)       To reduce colloid content and turbidity.

Prescriptions :

a)        To achieve these objectives, one can use :

• Static settling, either spontaneously or facilitated by the use of appropriate additives, consisting of leaving the must for a few hours in a tank, then separating the deposit by decanting.
• Dynamic settling by centrifugation or filtration.

b)       To avoid the commencement of fermentation, the must may be initially cooled and/or sulphited.

Recommendation of OIV:

Admitted