2. Characteristic values

The characteristic quantities of commercially available nanofiltration membranes have been grouped into 8 groups. These are :

• 1 - supply, specifying manufacturer, brand and membrane code;

• 2 - structural properties, which indicate the nature of the active layer;

• 3 - physico-chemical properties, which include cut-off values, rejection rate and the type of compound used for measurement;

• 4 - transfer properties, which only include flow density to water;

• 5 - mechanical properties, giving maximum or recommended working pressure;

• 6 - the outfit, which indicates the temperature and pH of the environment;

• 7 - the type of module produced and its model...