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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.

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Wikipedia About 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. 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.

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.

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.

Search results for Filtration

BHS Filtration

BHS Filtration Laboratory. BHS Process Laboratory. Rental Filters. Spare Parts and ... Products / Process & Filtration Testing / Rental Filters / News & Events ...bhs-filtration.com/

Cummins Filtration Products

As the world's leading supplier of filtration and exhaust systems, Cummins Filtration offers over 12,000 products under its broad family of brands.www.cumminsfiltration.com/en/products/index.shtml

Filtration Group, Inc

USA. Design and manufacture of nonwovens based filtration media for HVAC, dust, liquid, gas phase, cleanroom, and paint and finishing markets. ...www.filtrationgroup.com/

filtration: Definition from Answers.com

filtration n. The act or process of filtering. ... Architecture: filtration ... Veterinary Dictionary: filtration ...www.answers.com/topic/filtration

Liquid Process Systems, Inc.

Systems for process filtration and filtering heat transfer fluids, and custom pumping applications.www.lps-filtration.com/

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News about Filtration

New filtration system goes with the flow

Toronto SunI'm going with the flow -- no more bottled water. But I still thirst for a cold glass of clean, clear drinking water.http://torontosun.com/life/gadgets/

Worker injured in Carver acid spill

Boston GlobeBy Anne Baker, Globe Correspondent A man was treated and released from a hospital today after he was doused in sulfuric acid when a pipe broke during a routine cleaning of a water filtration facility at Decas Cranberry Products in...http://www.boston.com/news/local/breaking_news/2008/10/worke...

(AFX UK Focus) 2008-09-29 09:25 Amiad Filtration CFO Eder to step down by end year

Interactive InvestorLONDON (Thomson Financial) - Amiad Filtration Systems Ltd, a producer and global supplier of water filters and filtration systems for the industrial, municipal and irrigation markets, said Itamar Dov Eder, Chief Financial Officer, will step down by the end of 2008.http://www.iii.co.uk/news/?type=afxnews&articleid=6916841&su...

Residential sewage diverted to Montreal-area river

CBC MontrealAbout 60 homes in Laval, Que., are dumping raw sewage into Rivière-des-Prairies because they were never hooked up to a filtration plant in the area, according to a CBC investigation.http://www.cbc.ca/canada/montreal/story/2008/10/01/mtl-sewag...

Alhambra officials open water treatment plant

Pasadena Star-NewsALHAMBRA - Saying it will secure the city's drinking water supply for the future, officials Thursday held a grand opening for a new $13.8 million treatment plant. • Photo Gallery: Groundwater treatment http://www.pasadenastarnews.com/ci_10625079?source=rss

News about Filtration

Clean air ducts will help you breathe easier

Detroit NewsAmerican Standard Air says its AccuClean state of the art whole-house air filtration system for forced-air systems that removes up to 99.98 percent of allergens from filtered air. The company claims it is 100 times more effective than a standard ... http://www.detnews.com/apps/pbcs.dll/article?AID=/20081011/O...

City of Flagstaff to Host Ribbon Cutting Ceremony for Biogas (Methane ...

ForbesThe process uses screening, primary sedimentation, bio-filtration, secondary sedimentation, disinfection and filtration. Effluent from the plant is used for irrigation in east Flagstaff or discharged into the Rio de Flag. The facility also treats the ... http://www.forbes.com/businesswire/feeds/businesswire/2008/1...

Millipore opens Irish facility

Boston GlobeThe membranes are used in a wide range of Millipore products requiring precise filtration and purification. "Millipore is celebrating 20 years in Cork," Millipore chairman, president, and chief executive Martin Madaus said in a statement. "Since ... http://www.boston.com/business/ticker/2008/10/millipore_open...

AMO says FDA approves surgical agent Healon D

Boston GlobeHealon D is an ophthalmic viscosurgical device, designed to be used as a surgical aid in cataract removal, cornea transplants, glaucoma filtration and the implantation of intraocular lenses. The products are designed to make it easier for surgeons to ... http://www.boston.com/business/healthcare/articles/2008/10/0...

Environmental commissioner boss quits to be real estate CEO

New York Daily NewsLloyd's Department of Environmental Protection, which operates the city's sprawling and costly water and sewer system, has drawn fire for cost overruns for building the Croton Water Filtration Plant in the Bronx . Originally pegged at under $1 billion ... http://www.nydailynews.com/news/2008/10/08/2008-10-08_enviro...

Search results for Filtration

Filtration definition of Filtration in the Free Online Encyclopedia.

filtration: see sewerage sewerage, system for the removal and disposal of chiefly liquid wastes and of rainwater, which are collectively called sewage.http://encyclopedia2.thefreedictionary.com/filtration

Membrane Filtration Technology, Membrane Filtration Systems

We specialize in membrane filtration plants, membrane filtration technology and cross flow membrane filtration plants for food, dairy, chemical, pharmaceutical, biotechnology and ... http://www.geafiltration.com/index.asp

American Filtration and Separations Society

USA. Technical and educational, non-profit organization. Forum for the exchange of information amongst engineers, scientists and technologists in all fields of fluid and particle ... http://www.afssociety.org/

Cummins Filtration Products

As the world's leading supplier of filtration and exhaust systems, Cummins Filtration offers over 12,000 products under its broad family of brands.http://www.cumminsfiltration.com/en/products/index.shtml

Filtration Products Corporation: Home

FPC is committed to providing world class hydraulic filtration solutions to our customers in a timely and competitive manner. We offer a wide range of traditional filter assemblies ... http://www.filtrationproducts.com/
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Turtle Tank Filtration Systems

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Answers for Filtration

AlessandraWhat is the best filtration system for a 46gal saltwater aquarium?AlessandraI would not go with canister or HOB filters for SW. Canisters especially can become nitrAte factorys very easily and quickly. Live rock(50+lbs), live sand(substrate), and a good skimmer is your best b...craftyshakesHow fast do air filtration systems work?craftyshakesThey start working immediately but full effects of the new filter will be felt within an hourJewelWhat is the best water filtration system?JewelWhat you're looking for is termed a "whole-house filtration system." The biggest name in that industry, at least in the U.S., is Culligan ("Hey, Culligan man!"). There is some minor maintenance and re...foxxfire3000How do I increase the filtration for my pool?foxxfire3000- Well to answer your question about how to increase the filtration in your pool, First thing you need to know is what type of filter you have, cartridge filter, d.e filter, or sand? Each type of fil...Tomasita LHow do you make a wet/dry filtration system?Tomasita LHave a read of this page, lots of pictures to give you some ideas. http://www.monsterfishkeepers.com/forums/showthread.php?t=67797 Have a look around the MFK forum, lots of other threads on Sump...
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