dimanche 21 décembre 2008

Black Mayonnaise : Unseen Collaborator


"Sludge is the residual semi-solid material left from industrial, water treatment, or wastewater treatment processes.
When fresh sewage or wastewater is added to a settling tank, approximately 50% of the suspended solid matter will settle out in about an hour and a half. This collection of solids is known as raw sludge or primary solids and is said to be "fresh" before anaerobic processes become active. Once anaerobic bacteria take over, the sludge will become putrescent in a short time and must be removed from the sedimentation tank before this happens.
This is commonly accomplished two ways. In an Imhoff tank, fresh sludge is passed through a slot to the lower story or digestion chamber where it is decomposed by anaerobic bacteria, resulting in liquefaction and reduced volume of the sludge. After digesting for an extended period, the result is called "digested" sludge and may be disposed of by drying and then landfilling.
Alternately, the fresh sludge may be continuously extracted from the tank mechanically and passed to separate sludge digestion tanks that operate at higher temperatures than the lower story of the Imhoff tank and, as a result, digest much more rapidly and efficiently.
Excess solids from biological processes such as activated sludge can be referred to as sludge, although more often called "biosolids," a public relations term that is increasingly used by water professionals in the United States. Industrial wastewater solids are also referred to as sludge, whether generated from biological or physical-chemical processes. Surface water plants also generate sludge made up of solids removed from the raw water."

8 commentaires:

Anonyme a dit…
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Anonyme a dit…
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gulo gulo a dit…

y en a des qu'ont pas pigé visiblement ; ici on met un nom, même un nom de bouffon, mais on met un nom, ou on dégage

rvn a dit…

ça devait arriver; t'as quand même été patient

ravachi du bulb a dit…

clap clap clap pour la chro en anglais! c'est la classe... bon j'ai quasi-rien capté mais la vérité est ailleurs!

bouffonman a dit…

it is quite fuckin' nice
bien destroy comme y faut

The Moiz Basstard a dit…

http://scienceline.org/_s/files/2007/01/7544033b33c8f120.jpg
... Then, when the dieoff of the algae followed, the water became anoxic, causing much of the life to die. Now, there is a layer of "black mayonnaise" on the bottom (a black gelatinous material that is created by dead organic matter). So any new life gets choked off before it can thrive....

... It is nasty stuff down on the bottom of Boston Harbor, a slimy stew of decomposing petroleum products spiced with microbes, metals and PCBs that some environmental engineers call "black mayonnaise." ....

Hey double gulo t'aurais pas remplacé black mayonnaise par sludge dans ton article des fois?

Black Mayo, c'est mauvais, bouffez-en à vous en rendre malade.

Hail Warped Lunar SludgeCore

Anonyme a dit…
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