Air stripping is the transferring of volatile components of a liquid into an air stream. It is a
chemical engineeringtechnology used for the purification of groundwaters and wastewaters containing volatile compounds.
Volatile compounds have relatively high
vapor pressureand low aqueous solubility characterized by the compound’s dimensionless Henry's lawcoefficient, which is the ratio of the concentration in air that is in equilibrium with its concentration in water. Pollutants with relatively high Henry’s Law coefficients can be economically stripped from water. These include BTEXcompounds ( benzene, toluene, ethylbenzene, and xylenefound in gasoline, and solvents including trichloroethyleneand tetrachloroethylene. Ammoniacan also be stripped from wastewaters. Since Henry’s law coefficient increases with temperature, stripping is easier at warmer temperatures.
Although any device that promotes contact between air and water strips some volatile compounds, air strippers are usually packed towers or tray towers operated with countercurrent flow of water and air. Packed towers, such as shown in Figure 1, usually use engineered or random plastic packings. Design criteria for packed towers include surface area provided by the packing, column height and diameter, and air to water flow rates.
Since many of the compounds stripped are hazardous air pollutants, the air exiting a stripper may require emissions control. Carbon adsorption is often used and
catalytic oxidationis another option.
*cite book|author=Henry Z. Kister|title=
Distillation Design|edition=1st Edition|publisher=McGraw-Hill|year=1992|id=ISBN 0-07-034909-6
*cite book|author=Perry, R.H. and Green, D.W. (Editors)|title=
Perry's Chemical Engineers' Handbook|edition=7th Edition|publisher=McGraw-Hill|year=1997|id=ISBN 0-07-049841-5
* [http://www.frtr.gov/matrix2/section4/4_50.html Air Stripping] from a website page of the Federal Remediation Technologies Roundtable
* [http://www.jaeger.com/Brochure/airstripping.pdf Air Stripping of VOCs from Water]
* [http://www.usace.army.mil/publications/design-guides/dg1110-1-3/entire.pdf Air Stripping, Design Guide 1110-1-3] from website page of the
U.S. Army Corps of Engineers
Wikimedia Foundation. 2010.
Look at other dictionaries:
Stripping (chemistry) — Stripping is a chemical separation process where one or more components are removed from a liquid stream by a vapor stream. In industrial applications the liquid and vapor streams can have concurrent or countercurrent flows. Stripping is usually… … Wikipedia
Stripping (television) — Stripping is an industry term used to refer to the practice of running a syndicated television series every day of the week. It is commonly restricted to describing the airing of shows which were weekly in their first run; The West Wing could be… … Wikipedia
air locking — noun : materials (as weather stripping) and devices used in building construction for making enclosed spaces airtight … Useful english dictionary
History of Air New Zealand — The history of Air New Zealand, the national carrier of New Zealand, began when the amalgamated East Coast Airways and Cook Strait Airways began operations in January 1936 as Union Airways of N.Z. Ltd, the country s first major airline. Union was … Wikipedia
Indoor air quality — (IAQ) is a term referring to the air quality within and around buildings and structures, especially as it relates to the health and comfort of building occupants. IAQ can be affected by microbial contaminants (mold, bacteria), gases (including… … Wikipedia
Andersen Air Force Base — Part of Pacific Air Forces (PACAF) Located near: Yigo, Guam … Wikipedia
Myrtle Beach Air Force Base — Part of Tactical Air Command (TAC) Myrtle Beach, South Carolina … Wikipedia
Marine Corps Air Station El Toro — MCAS El Toro MCAS El Toro in 1993 IATA: NZJ – ICAO: KNZJ – FAA LID: NZJ … Wikipedia
Weather stripping or caulking — Any of several kinds of crack filling material around any windows or doors to the outside used to reduce the passage of air and moisture around moveable parts of a door or window. Weather stripping is available in strips or rolls of metal,… … Energy terms
weather stripping — weath|er strip|ping [ weðər ,strıpıŋ ] noun count or uncount a thin piece of material such as plastic that is placed around the sides of a door or window to prevent cold air from coming in ╾ weath|er strip verb transitive … Usage of the words and phrases in modern English