13 - 15 November 2018 // Nuremberg

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Exhibitors & Products BrauBeviale 2016
Zoom product LOGO_Cross-flow filters with ceramic membranes

Cross-flow filters with ceramic membranes

LOGO_Cross-flow filters with ceramic membranes

Cross-flow filters with ceramic membranes

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Filtration has always been a key process in the beverage industry, and the continuing evolution in product cleaning needs has led to today’s marked preference for cross-flow filtration. Although frontal filtration with kieselgur, sheet or membrane filters is still used today, the companies’ present and future interest and resulting investments are now being focused on the cross-flow system. The reason for this growing interest is the possibility to achieve clarity and microbiological stability with just one operation regardless of the product’s turbidity, in this way obtaining low microbe counts even when starting with untreated products with complete respect for organoleptic characteristics as well.  These extremely important guarantees combine with significant reductions in production costs to make cross-flow filtration the ideal and practically definitive solution for all the company’s needs. For these reasons, Della Toffola proposes its CFKN and CFKA model cross-flow filters with ceramic membranes that use mineral or inorganic hollow fiber, a constructive approach by now well established that minimizes dead times and eliminates the problems caused by the use of organic membranes.  The liquid to be filtered flows tangentially to the membrane’s surface, and the solids are separated from the liquid occurs by pressure difference. The membranes are constantly cleaned by the liquid flowing parallel that permits extremely long filtration cycles. A back wash system that regularly carries away the slender layer of impurity that forms on the membrane is used to prolong the filtration cycle even longer. The filtration cycle ends when a low flow of the permeate or an excessive concentration of solids in the filtrate is observed. Thanks to the ceramic material in the membranes washing with high temperature water or even chemicals and sanitizing substances such as sodium hydroxide, phosphoric acid can be performed after filtration with citric acid as neutralizing solution. The liquid to be filtered should contain only traces of bentonite or ideally none at all. Hourly flow depends on membrane porosity (0.2 – 0.3 – 0.45 microns), the type of product, and its condition and temperature. Generally speaking, flow ranges from 30 to 100 liters per square meter. The ceramic membranes used by Della Toffola offer the absolutely highest productive performance, optimum regeneration capacity, and a working life guaranteed for 10 years. Each ceramic membrane supports a mixture of titanium oxide and zirconium oxide cast at extremely high temperature over its internal surface. The mixture of oxides is practically the heart of the filtration process and accounts for the degree of micrometric porosity with selection possible from the lowest value of 0.2 microns to 1.4 micron mesh and more. This gives these filters a decisive competitive edge and suits them to practically all types of beverage by permitting the choice of the most appropriate membrane. All this provides a solid point of reference for clients who decide to invest in cross-flow filtration. All models are standard produced with fully automatic operation under guaranteed safety, easy use, and continuous filtration cycles: the only step required is the connection of the filter to the tanks for the liquid to be filtered and the liquid filtered. Automation has been extended to every phase in the cycle: filling, filtration with trans-membrane pressure control, back-wash, drainage, washing with automatic feeding of the products to be filtered and subsequent resumption of filtration, and the management of every other client need. Della Toffola offers the market a complete and renewed selection of models ranging from 20 to over 1,000 square meters of filtration area. Another important advantage is the modularity of these filters: a perfectly operating machine that contains a lower number of membranes than it can hold can be proposed in order to ensure the greatest freedom for future expansion when more membranes are inserted. For example, a 130 sq m filter can be purchased with just 80 sq m of membrane inside; the remaining 50 sq m can be inserted later. Cross-flow filtration with ceramic membranes is being adopted by more and more of the world’s leading productive units and is only destined to keep growing in application.

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