9 Lecture 22 Oct 2015 Filtration APP - Outline...

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10/22/2015 1 4010 Food Processing II Concentration processes October 22, 2015 1 (Adapted from D. Daugelaite, Food Science, UofM, 2014) 2 Outline Concentration processes: Filtration Membrane technology, membrane properties, membrane types Reverse osmosis Applications Introduction Filtration Filtration is the removal of insoluble solids from suspension by passing through a porous material. The resulting liquor is termed the ‘filtrate’ and the separated solids are the ‘filter cake’. In Food processing, filtration is used to separate colloidal materials or small amounts of solid particles from aqueous foods. Ex: wine, beer, juice, oils syrups, and water Filtration is also used for steam and gas (CO 2 , N 2 and air) that is later used in food processing 3 Introduction Filtration During filtration thermolabile constituents is not damaged, unlike in evaporation, but the degree of concentration in filtrate with using reverse osmosis is about half of evaporation. Using filtration can separate (listed in decreasing order of size): Emulsion concentrates Bacteria/viruses Proteins/polyssacharides Ions (using reverse osmosis) 4 5 Images from: Llamas, Texas A&M University F = feed; M = membrane; P = permeate ; (components that pass through membrane) R = retentate (components that do NOT pass through the membrane) 1. Dead End Flow 2. Cross Flow Mode of operation: F P M F P M R Mode of operation: 1. Perpendicular arrangement Pressure is the driving force for separation of components of interest Disadvantages: it is a batch process, hard to maintain good quality control build up of filter cake on membrane P Filter Feed Permeate Images: wikipedia 6
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10/22/2015 2 Mode of operation: 2. Parallel or cross flow It is a continuous process Does not cause buildup of filter cake on membrane More surface area using membranes Images: wikipedia 7 8 Membrane filtration is a technique that uses a physical barrier, a porous membrane or filter, to separate particles in a fluid. Particles are separated on the basis of their size and shape with the use of pressure and specially designed membranes with different pore sizes.
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