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 material(s).

• 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. The particle size distribution (PSD of a powder or granular material or particles dispersed in fluid is a list of values or a mathematical function that defines the relative amounts 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. A coffee filter is a Coffee -brewing utensil, usually made of disposable paper but recently Stainless steel. A high efficiency Particulate air or HEPA (ˈhɛpə filter is a type of high-efficiency Air filter. The term air conditioning refers to the cooling and dehumidification of indoor air for Thermal comfort.

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). Liquid is one of the principal States of matter. A liquid is a Fluid that has the particles loose and can freely form a distinct surface at the boundaries of This page is about the physical properties of gas as a state of matter A supercritical fluid is any substance at a Temperature and Pressure above its Thermodynamic critical point. To separate a mixture of chemical compounds, a solvent is chosen which dissolves one component, while not dissolving the other. A solvent is a liquid or gas that dissolves a solid liquid or gaseous Solute, resulting in a Solution. 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 water streams or other river 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. Designed to handle heavy dust loads a dust collector consists of a blower dust filter a filter-cleaning system and a dust receptacle or dust removal system (distinguished from air cleaners

The remainder of this article focuses primarily on liquid filtration.

Methods

There are many different methods of filtration; all aim to attain the separation of substances. In Chemistry and Chemical engineering, a separation process is used to transform a Mixture of substances into two or more distinct products 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. FLUID ( F ast L ight '''U'''ser '''I'''nterface D esigner is a graphical editor that is used to produce FLTK Source code e. a liquid or gas. Liquid is one of the principal States of matter. A liquid is a Fluid that has the particles loose and can freely form a distinct surface at the boundaries of This page is about the physical properties of gas as a state of matter

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. A Büchner funnel is a piece of Laboratory equipment used in Suction filtration. Filter paper is a semi-permeable Paper barrier placed Perpendicular to a liquid flow

For example an experiment to prove the existence of microscopic organisms involves the comparison of water passed through unglazed porcelain and unfiltered water. A microorganism (also spelled micro organism or micro-organism and also called a microbe) is an Organism that is Microscopic (usually Porcelain is a Ceramic material made by heating raw materials generally including Clay in the form of Kaolin, in a Kiln to temperatures 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. The Bacteria ( singular: bacterium) are a large group of unicellular Microorganisms Typically a few Micrometres in length bacteria have Alternate methods often take the form of electrostatic attractions. Electrostatics is the branch of Science that deals with the Phenomena arising from what seems to be stationary Electric charges Since Classical These form of filters again have the problem of either becoming clogged, or the active sites on the filter all become used by the undesirable. However, most chemical filters are designed so that the filter can be flushed with a chemical that will remove the undesirables and allow the filter to be re-used.

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. Backwash is the backwards flow of Air or Water. Backwash can be created naturally by Waves rebounding off a Beach or other obstacle

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. Diatomaceous earth (ˌdaɪətəˈmeɪʃəs ˈɝθ also known as DE, TSS, diatomite, diahydro, kieselguhr, kieselgur and Diatomaceous earth (ˌdaɪətəˈmeɪʃəs ˈɝθ also known as DE, TSS, diatomite, diahydro, kieselguhr, kieselgur and Pasteur pipettes, also known as droppers or eye droppers, are used to transfer small quantities of liquids

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. The Chemical compound silicon dioxide, also known as silica or silox (from the Latin " Silex " is an Oxide 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. Porosity is a measure of the void spaces in a material and is measured as a fraction between 0–1 or as a Percentage between 0–100% 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. Precipitation is the formation of a Solid in a Solution during a Chemical reaction.

Alternatives

Filtration is a more efficient method for the separation of mixtures than decantation, but is much more time consuming. In Chemistry and Chemical engineering, a separation process is used to transform a Mixture of substances into two or more distinct products Decantation is a process for the Separation of mixtures carefully pouring a solution from a container leaving the Precipitate ( Sediments in the bottom If very small amounts of solution are involved, most of the solution may be soaked up by the filter medium. In Chemistry, a solution is a Homogeneous Mixture composed of two or more substances

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. Centrifugation is a process that involves the use of the Centrifugal force for the separation of mixtures used in industry and in laboratory settings 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)
• 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. Renal physiology is the study of the Physiology of the Kidneys Functions of the kidney The functions of the kidney can be divided into two groups The kidneys are complicated organs that have numerous biological roles Blood is a specialized Bodily fluid that delivers necessary substances to the body's cells ��such as nutrients and oxygen—and transports Waste products A glomerulus is a Capillary tuft surrounded by Bowman's capsule in Nephrons of the vertebrate Kidney.

See also

• Category:Filters
• Separation of mixtures
• Microfiltration
• Ultrafiltration
• Nanofiltration
• Reverse osmosis
• Filter (water)

Footnotes

References

Air filter Engineering (M) Sdn. Bhd.

Further reading

• www.filtsep.com
• filtration equipment expert system and data analysis