For metering filter aids during filtration, the LEWA ecodos sanitary/hygienic design is an optimum solution, because it is designed for handling diatomite suspensions.
How are filter aids metered in the beverage industry?
Before the bottling, beverages like beer, wine or fruit juices have to be filtered, which means, undesired solids have to be separated from the fluid. For successful filtration, a filter aid is needed. An example for such a filter aid is kieselguhr, which filters out yeast and protein components of high molecular weight. The filtration process begins with a precoating of the filter plates.
A consistently distributed kieselguhr suspension is metered into a water flow or directly into the product. From then, kieselguhr has to be added constantly, so that the filter cake remains porous. Because of the added filter aid, the filter cake grows continuously and increases the filter depth. If enough kieselguhr is dosed, the lifetime of the filter can be optimized.