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 ?
There has been a limited study in triticale production with sewage sludge application by testing whether sewage sludge can be substituted for inorganic mineral fertilizers or not.
The waste paper sludge (WPS) samples were collected from a Pulp and Paper Industries located in Kotri, near Hyderabad, Sindh, Pakistan.
Around 5 kg of oily sludge was placed in zibber bag and was stored in the laboratory.
As can be seen in Table 4, the average lead in terms of milligrams per kilogram of dry weight in dewatered sludge samples was equal to 19/5 [+ or -] 5/14 That compared with the standards, the average lead is below the permissible limit of Environmental Protection Agency standards of Iran (300), EPA (840), Canada (farming purposes = 70 = 140 residential purposes and park land, commercial, industrial = 260), Great Britain (300), Taiwan (50), New Jersey (target = 400 residential, non-residential purposes = 600), the Netherlands (50), Australia (100) Belgium (500), Ireland (50) and Georgia (400).
Decreased in both TSS and VSS of sludge confirms the occurrence of disintegration by ozonation [6] causing an increment value of intracellular compounds of SCOD.
The test sludge was provided on a daily basis, by the sewage treatment plant in Pirbazar town in Rasht.
While sludge sold to consumers must be virtually pathogen free, sludge used on farms and industrial sites is permitted to contain low levels of human pathogens.
We delivered sludge for use on 2,808 celds in the last cnancial year.
Kayla had her own diagnosis: the coal processing plant and sludge impoundment operated by subsidiaries of Massey Energy that loom right above the school.