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|  Cross flow filter "Nitor"  On our filters capillary modules (0,2 micron porosity) are installed. The actual evolution is deeply changing the enological landscape: 1. The preservation and valorisation of the organoleptic qualities of wines lead to the technicians' aversion towards clarifying agents. The reduction of bentonite, gelatine or other clarifying agent is possible filtering with a "Nitor" unit. 2. The environment concern makes more and more problematic the kieselgur wasting, whereas with "Nitor" filter this problem is cancelled. 3. The difficult to find out qualified operators and the high cost per litre of treated product oblige the enological industry to prefer versatile and completely automatic machines. "Nitor" filter is available in two versions: semi-automatic version (30 /60 m²) and completely automatic version, that is able to carry out all the functions in automatic. Besides this, it can handle both still wines and also sparkling wines if equipped with the suitable accessories kit. In the automatic version, "Nitor" is built as a modular filter. The smallest automatic model is made up by 6 (six) membranes (60 m²), but basis module (pumps + control panel) is already equipped for an enlargement till 18 (eighteen) membranes (180 m²). The plant is foreseen for the adding of standard elements of 3 (three) membranes each. The "Nitor" filter allows to reach the microbiological stability. In fact membrane porosity (0,2 micron) permits to retain most of the bacteria even though there is not any absolute sterility guarantee. Anyway, "Nitor" can be used for the filtration before bottling by placing before the filler a traditional membrane filter with an optimum filterability. The "Nitor" filter can be sterilised only with chemical products such as peracetic acid (products with a basis of chlorine are not suitable). As far as the filtration yield is concerned, we may consider an average of 40 - 50 l/m²/h at 20°C with decanted wine, whenever suspended solids are not higher than 1%. The "Nitor" filter, because of its particular membrane, does not need any safety membrane pre-filter. Membrane features: Material: polypropylene Internal fibre Ø : mm 1,8 Pores Ø : micron 0,2 Filtering membrane thickness : mm 0,4 Geometric: symmetric Sparkling wine filtration: standard modules The membranes in polypropylene allow an efficient back-wash for cartridge cleaning by sending the same filtered wine in counter-current. They can be repaired and they can be stored perfectly dry when they are not operating. The membranes can be washed with alkaline products with a basis of sodium hydroxide (caustic soda) having a concentration between 2 and 5%. If necessary, they can stand also higher concentrations (max 20%). Membrane thickness guarantees a major resistance. By using "Nitor" filters most of wine components remains unchanged with reference to their values before filtration. In fact we have proved that no organoleptic modification occurs to the wines because of cross-flow filtration with "Nitor" filters. TECHNICAL ADVANTAGES: · Replacement of sheets and kieselgur filters that implies: - lower purchasing and storing costs - better work hygiene and safety for the operations - lesser waste problems - lower product lost (each kg of kieselgur has an average humidity of 60%). · Reduction/elimination of clarifying agents. · Reduction of labour costs. TECHNOLOGICAL ADVANTAGES · Production of "sterile" juices and musts. · Stoppage of malo-lactic fermentation. · Cold sterilisation. · Prevention from anomalous fermentations. · Formulation of special products (wine cooler, muscats) · Eases the preparation of ground wines before the second fermentation. · Recovery of pure tartrates. | ||||||||||
