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ANNEX IU.K.

Appendix 5U.K.

Requirements for electrodialysis treatment U.K.

The purpose is to obtain tartaric stability of the wine with regard to potassium hydrogen tartrate and calcium tartrate (and other calcium salts) by extraction of ions in supersaturation in the wine under the action of an electrical field and using membranes that are either anion-permeable or cation-permeable.

1.MEMBRANE REQUIREMENTSU.K.
1.1.The membranes are to be arranged alternately in a ‘filter-press’ type system or any other appropriate system separating the treatment (wine) and concentration (waste water) compartments.U.K.
1.2.The cation-permeable membranes must be designed to extract cations only, in particular K+, Ca++.U.K.
1.3.The anion-permeable membranes must be designed to extract anions only, in particular tartrate anions.U.K.
1.4.The membranes must not excessively modify the physico-chemical composition and sensory characteristics of the wine. They must meet the following requirements:U.K.

The stability of fresh electrodialysis membranes is to be determined using a simulant reproducing the physico-chemical composition of the wine for investigation of possible migration of certain substances from them.

The experimental method recommended is as follows:

The simulant is a water-alcohol solution buffered to the pH and conductivity of the wine. Its composition is as follows:

This solution is used for closed circuit migration tests on an electrodialysis stack under tension (1 volt/cell), on the basis of 50 l/m2 of anionic and cationic membranes, until 50 % demineralisation of the solution. The effluent circuit is initiated by a 5 g/l potassium chloride solution. Migrating substances are tested for in both the simulant and the effluent.

Organic molecules entering into the membrane composition that are liable to migrate into the treated solution will be determined. A specific determination will be carried out for each of these constituents by an approved laboratory. The content in the simulant of all the determined compounds must be less than 50 μg/l.

The general rules on controls of materials in contact with foodstuffs must be applied to these membranes.

2.MEMBRANE UTILISATION REQUIREMENTSU.K.

The membrane pair is formulated so that the following conditions are met:

The treatment is to be recorded in the register referred to in Article 147(2) of Regulation (EU) No 1308/2013.