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=== Article of the Week <font size=1>[ [[CZ:Article of the Week|about]] ]</font> ===
=== Article of the Week <font size=1>[ [[CZ:Article of the Week|about]] ]</font> ===
{{Image|Shallow Ground-level Trickle Filters.jpg|right|274px|Large, shallow ground-level trickle filters in a municipal wastewater treatment plant}}  
{{Image|Shallow Ground-level Trickle Filters.jpg|right|200px|Large, shallow ground-level trickle filters in a municipal wastewater treatment plant}}  
'''Large-scale trickle filters''' are wastewater treatment facilities for biochemically oxidizing biodegradable substances present in wastewaters. They consist of a fixed bed of [[Rock (geology)|rock]]s, [[gravel]], [[slag]], [[polyurethane|polyurethane foam]] or plastic media over which [[sewage]] or other [[biodegradable]] [[wastewater]] percolates downward and is contacted with a layer or film of [[Microbe|microbial]] slime covering the bed media. [[Aerobic]] conditions are maintained by air flowing through the bed.
'''Large-scale trickle filters''' are wastewater treatment facilities for biochemically oxidizing biodegradable substances present in wastewaters. They consist of a fixed bed of [[Rock (geology)|rock]]s, [[gravel]], [[slag]], [[polyurethane|polyurethane foam]] or plastic media over which [[sewage]] or other [[biodegradable]] [[wastewater]] percolates downward and is contacted with a layer or film of [[Microbe|microbial]] slime covering the bed media. [[Aerobic]] conditions are maintained by air flowing through the bed.



Revision as of 00:43, 12 February 2009


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Article of the Week [ about ]

(PD) Photo: U. S. Environmental Protection Agency
Large, shallow ground-level trickle filters in a municipal wastewater treatment plant

Large-scale trickle filters are wastewater treatment facilities for biochemically oxidizing biodegradable substances present in wastewaters. They consist of a fixed bed of rocks, gravel, slag, polyurethane foam or plastic media over which sewage or other biodegradable wastewater percolates downward and is contacted with a layer or film of microbial slime covering the bed media. Aerobic conditions are maintained by air flowing through the bed.

The terms trickling biofilter, biofilter, biofilm reactor, biological filter, biological trickling filter and biotower are often used to refer to a trickle filter. These systems have also been described as an attached growth process , a fixed film process, packed media bed filters, roughing filters and percolating filters. [more...]

New Draft of the Week [ about ]

Joseph Black (1728-1799), was a Scottish chemist and physicist, known for the concepts of latent heat and specific heat, and for the discovery of carbon dioxide. He was a founder of thermochemistry, and was the mentor of James Watt. Black was a member of the Poker Club and friend of David Hume, Adam Smith, James Hutton and other leading figures of the Scottish Enlightenment.

Joseph Black was one of fifteen children (8 sons and 5 daughters surviving). His father, John Black, was a wine merchant; his mother, Margaret, was from Aberdeenshire. At the age of twelve, he was sent to a grammar school in Belfast to learn Latin and Greek. In 1744 he enrolled at Glasgow University to study arts, subsequently changing, to study medicine. There, William Cullen was his instructor in chemistry, and the relation between the two soon became that of professor and assistant rather than of master and pupil. [more...]