sludge


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Related to sludge: Activated sludge, Engine sludge

sludge

1. any deposit or sediment
2. a surface layer of ice that has a slushy appearance
3. (in sewage disposal) the solid constituents of sewage that precipitate during treatment and are removed for subsequent purification

sludge

[sləj]
(chemical engineering)
Residue left after acid treatment of petroleum oils.
Any semisolid waste from a chemical process.
(civil engineering)
(engineering)
Mud from a drill hole in boring.
Sediment in a steam boiler.
A precipitate from petroleum oils or liquid fuels, for example, the insoluble degradation products formed during the operation of an internal combustion engine.
An amorphous deposit that has accumulated on the surface of a tube in a heat exchanger or of an evaporating device, but is not bonded to the fouled surface.
(geology)
A soft or muddy bottom deposit as on tideland or in a stream bed.
(oceanography)
A dense, soupy accumulation of new sea ice consisting of incoherent floating frazil crystals. Also known as cream ice; sludge ice; slush.

sludge

1. Refuse from various operations, as the waste material produced in the wet grinding of terrazzo.
2. In a paint spray booth whose walls are washed continuously with water, the paint which accumulates in the water reservoir, sometimes reworked to make another paint.
3. The accumulated, settled solids which are deposited from sewage and contain more or less water to form a semiliquid mass.

sludge

A heavy contaminant that forms in an aircraft engine lubricating oil. This is caused by oxidation and the chemical decomposition of oil as a part of normal usage.
References in periodicals archive ?
Half an hour later, a taxi pulled-up with Sludge inside and we went to the club.
Indeed, Wolverhampton Wolves Speedway has posted an online tribute to Sludge: "We are deeply saddened to learn of the passing of popular comedian Ian 'Sludge' Lees, a good friend of the club.
Dredged Sludge. The dredged sludge investigated in this study was from the river in the city of Shenzhen, China.
Sewage sludge: Dried sewage sludge was obtained from the Campus of Yuzuncu Yil University Waste Water Unit.
A control mortar mixture and nine modified mixture of mortar containing calcined paper sludge treated at 600degC, 700degC and 800degC with 1hr, 2hrs and 3hrs duration were considered.
Kal oil field in Potwar Plateau was selected for oily sludge. Around 5 kg of oily sludge was placed in zibber bag and was stored in the laboratory.
Reduction of SVI value indicates a good settling and compact sludge. SVI for both neutral and alkaline medium sludge was 39 and 40 respectively.
So those fumes get trapped and solidify, forming sludge and gunking up the top of the engine.
Experimental results obtained by testing sewage sludge taken from different municipal wastewater treatment works confirmed that solids concentration is the main parameter affecting sludge rheological behaviour [4].
In addition, nitrogen content in the sewage sludge is generally in the range of 4-8%, much higher than that in the coal [9, 10], and fuel-N is the main source of NO and [N.sub.2]O emissions at low combustion temperatures [11].