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14-September-2008 18:02:46 - Filtration This article is about operation of solid-fluid separation. For the mathematical concept, see filtration mathematics. For the equipment used, see filter. diagram of a simple filtration diagram of a simple filtration Filtration is a mechanical or physical operation which is used for the separation of solids from fluids liquids or gases by interposing a medium to fluid flow through which the fluid can pass, but the solids or at least part of the solids in the fluid are retained. It has to be emphasized that the separation is NOT complete, and it will depend on the pore size and the thickness of the medium as well as the mechanisms that occur during filtration. Filtration is used for the purification of fluids: for instance separating dust from the atmosphere to clean ambient air. Filtration, as a physical operation is very important in chemistry for the separation of materials of different chemical composition in solution or solids which can be dissolved by first using a reagent to precipitate one of the materials and then use a filter to separate the solid from the other materials. Filtration is also important and widely used as one of the unit operations of chemical engineering. It is important not to confuse filtration with sieving. In sieving there is only a single layer of medium where size separation occurs purely by the fact that the fraction of the particulate solid matter which is too large to be able to pass through the holes of the sieve, scientifically called oversize See particle size distribution are retained. In filtration a multilayer medium is involved, where other mechanisms are included as well, for instance direct interception, diffusion and centrifugal action, where in this latter those particles, which are unable to follow the tortuous channels of the filter will also adhere to the structure of the medium and are retained.1 Depending on the application, either one or both of the components may be isolated. Examples of filtration include A a coffee filter to keep the coffee separate from the grounds and B the use of HEPA filters in air conditioning to remove particles from air. The filtration process separates particles and fluid from a suspension, and the fluid can be either a liquid or a gas or a supercritical fluid. To separate a mixture of chemical compounds, a solvent is chosen which dissolves one component, while not dissolving the other. By dissolving the mixture in the chosen solvent, one component will go into the solution and pass through the filter, while the other will be retained. This is one of the most important techniques used by chemists to purify compounds. Filtration also cleans up air streams or other gas streams. Furnaces use filtration to prevent the furnace elements from fouling with particulates. Pneumatic conveying systems often employ filtration to stop or slow the flow of material that is transported, through the use of a baghouse. The remainder of this article focuses primarily on liquid filtration. Contents 1 Methods 2 Flowing 3 Filter media 4 Filter aid 5 Alternatives 6 Filter types 7 In kidney 8 Footnotes 9 References 10 Further reading Methods There are many different methods of filtration; all aim to attain the separation of substances. This is achieved by some form of interaction between the substance or objects to be removed and the filter. In addition the substance that is to pass through the filter must be a fluid, i.e. a liquid or gas. The simplest method of filtration is to pass a solution of a solid and fluid through a porous interface so that the solid is trapped, while the fluid passes through. This principle relies upon the size difference between the particles making up the fluid, and the particles making up the solid. In the laboratory, a Büchner funnel is often used, with a filter paper serving as the porous barrier. For example an experiment to prove the existence of microscopic organisms involves the comparison of water passed through unglazed porcelain and unfiltered water. When left in sealed containers the filtered water takes longer to go foul, showing that very small items such as bacteria can be removed from fluids by filtration. Flowing Liquids usually flow through the filter by gravity. This is the simplest method, and can be seen in the coffeemaker example. For chemical plants, this is usually the most economical method as well. In the laboratory, pressure in the form of compressed air may be applied to make the filtration process faster, though this may lead to clogging or the passage of fine particles. Alternatively, the liquid may flow through the filter by the force exerted by a pump. In this case, the filter need not be mounted vertically. Filter media There are two main types of filter media - a solid sieve which traps the solid particles, with or without the aid of filter paper, and a bed of granular material which retains the solid particles as it passes. The first type allows the solid particles, i.e. the residue, to be collected intact; the second type does not permit this. However, the second type is less prone to clogging due to the greater surface area where the particles can be trapped. Also, when the solid particles are very fine, it is often cheaper and easier to discard the contaminated granules than to clean the solid sieve. Filter media can be cleaned by rinsing with solvents or detergents. Alternatively, in engineering applications, such as swimming pool water treatment plants, they may be cleaned by backwashing. Examples of the first type include filter paper used with a Buchner, Hirsch, filter funnel or other similar funnel. A sintered-glass funnel is often used in chemistry laboratories because it is able to trap very fine particles, while permitting the particles to be removed by a spatula. Examples of the second type include filters at municipal and swimming pool water treatment plants, where the granular material is sand. In the laboratory, Celite or diatomaceous earth is packed in a Pasteur pipette microscale or loaded on top of a sintered-glass funnel to serve as the filter bed. The following points should be considered while selecting the filter media: ability to build the solid. minimum resistance to flow the filtrate. resistance to chemical attack. minimum cost. long life. Filter aid Certain filter aids may be used to aid filtration. These are often incompressible diatomaceous earth or kieselguhr, which is composed primarily of silica. Also used are wood cellulose and other inert porous solids. These filter aids can be used in two different ways. They can be used as a precoat before the slurry is filtered. This will prevent gelatinous-type solids from plugging the filter medium and also give a clearer filtrate. They can also be added to the slurry before filtration. This increases the porosity of the cake and reduces resistance of the cake during filtration. In a rotary filter, the filter aid may be applied as a precoat; subsequently, thin slices of this layer are sliced off with the cake. The use of filter aids is usually limited to cases where the cake is discarded or where the precipitate can be separated chemically from the filter. Alternatives v d e Separation processes Processes Acid-base extraction · Chromatography · Crystallization · Dissolved air flotation · Distillation · Drying · Electrochromatography · Filtration · Flocculation · Froth flotation · Liquid-liquid extraction · Recrystallization · Sedimentation · Solid Phase Extraction · Sublimation Separation process schematic Devices API oil-water separator · Centrifuge · Depth filter · Mixer-settler · Protein skimmer · Spinning cone · Still · Sublimation apparatus Multiphase systems Aqueous two phase system · Azeotrope · Eutectic Filtration is a more efficient method for the separation of mixtures than decantation, but is much more time consuming. If very small amounts of solution are involved, most of the solution may be soaked up by the filter medium. An alternative to filtration is centrifugation - instead of filtering the mixture of solid and liquid particles, the mixture is centrifuged to force the usually denser solid to the bottom, where it often forms a firm cake. The liquid above can then be decanted. This method is especially useful for separating solids which do not filter well, such as gelatinous or fine particles. These solids can clog or pass through the filter, respectively. Filter types Gravity filter open system that operates with water column pressure only Pressure filter closed system that operates under pressure from a pump Side stream filter filter in a closed loop, that filters part of the media per cycle only Depth filter Continuous rotary filters In kidney Main article: Renal filtration The kidney works by filtration of blood in the glomerulus, followed by selectively reabsorbing many substances essential for the body. ==See also== Look up filtration in Wiktionary, the free dictionary. Category:Filters Separation of mixtures Microfiltration Ultrafiltration Nanofiltration Reverse osmosis Filter water Footnotes ^ Lecture notes, Postgraduate course on Filtration and Size separation at the Department of Chemical Engineering, University of Lougborough, England References Air filter Engineering M Sdn. Bhd. Further reading www.filtsep.com filtration equipment expert system and data analysis Retrieved from http://en..org/wiki/Filtration Categories: Separation processes | Analytical chemistry | Laboratory techniques | Unit operations | Alchemical processes Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page Languages Català Česky Deutsch Ελληνικά Español Français í•œêµì–´ Bahasa Indonesia Italiano עברית Lietuvių Nederlands 日本語 Polski РуÑ?Ñ?кий СрпÑ?ки / Srpski УкраїнÑ?ька ä¸æ–‡ This page was last modified on 8 September 2008, at 23:2
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