In the case of juice recovered from lees for example, the filtrate can be added back to the settled juice to undergo fermentation.Īs the drum continues to rotate, now with the filtered solids on the exterior surface, a blade removes the solids and a thin layer of the filter medium cake, which is collected as waste. The clean filtrate can now be passed to storage. The liquid filtrate passes through the cake and the suspended solids remain on the surface of the cake. This time, as the drum rotates about the axle, the vacuum applied to the interior of the drum draws the suspension onto the surface of the filter cake. With the cake in place, the tub is drained of remaining filter medium and them filled with the liquid to be filtered. According to the FDA, perlite does not pose any health risks and does not have any stringent disposal criteria. DE is classified as a carcinogen and must be disposed of as hazardous waste. Perlite meanwhile, is an amorphous (un-crystallized) silicate, containing less than one tenth of one percent (.001) crystalline and so is much safer to handle. Filter grade DE is a crystalline silicate, which can cut the throat and lungs if inhaled. Vintech Pacific use exclusively expanded perlite as the filter medium, rather than diatomateous earth. As the drum rotates about the axle, a vacuum applied to the interior of the drum draws the filter medium onto the surface of the drum to form a cake. When setting up, the tub is filled with a mixture of water and diatomateous earth (DE) or more commonly, perlite as the filter medium. The machine consists of a large drum covered by a fine mesh or cloth. The filter’s operation is continuous and automatic so operating costs are relatively low. It is ideally suited to the filtration of slurries and liquids with high solids content. RDV is one of the oldest concepts in modern filtration, patented in 1872. As much as 80 percent of juice from lees that was once dumped down the drain can now be kept – all adding to yield per tonne of grapes harvested. The RDV filtration process recovers juice and wine from lees that would otherwise be discarded.
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