• WordNet 3.6
    • n sludge the precipitate produced by sewage treatment
    • n sludge any thick, viscous matter
    • ***
Webster's Revised Unabridged Dictionary
    • Sludge Anything resembling mud or slush; as: A muddy or slimy deposit from sweage. Mud from a drill hole in boring. Muddy sediment in a steam boiler. Settling of cottonseed oil, used in making soap, etc. A residuum of crude paraffin-oil distillation.
    • Sludge Mud; mire; soft mud; slush.
    • Sludge (Mining) See Slime, 4.
    • Sludge Small floating pieces of ice, or masses of saturated snow.
    • ***
Century Dictionary and Cyclopedia
    • n sludge Mud; mire.
    • n sludge A pasty mixture of snow or ice and water; half-melted snow; slush.
    • n sludge In mining, the fine powder produced by the action of the drill or borer in a bore-hole, when mixed with water, as is usually the case in large and deep bore-holes. The powder when dry is often called bore-meal.
    • n sludge Refuse from various operations, as from the washing of coal; also, refuse acid and alkali solutions from the agitators, in the refining of crude petroleum: sometimes used, but incorrectly, as the equivalent of slimes, or the very finely comminuted material coming from the stamps. See Slime, 3.
    • n sludge The more or less viscid mud thrown down from dilute waste soap-liquors of wool-scouring, cotton-bleaching, and dyeing industries when such liquors are treated with crude aluminium sulphate and milk of lime. The remaining effluent is thus in a large measure purified, but the sludge thrown down has usually little value, even as a manure.
    • n sludge The precipitated solid matter in sewage, usually collected in settling-basins in sewage-disposal works after chemical treatment and filtration. Often pressed into cakes.
    • n sludge The sediment, in the form of a mud, which collects in a steam-boiler.
    • n sludge Incorrectly, by abbreviation, an opening in a steam-boiler for the removal of sludge or mud; also, the lid which covers such an opening.
    • n sludge A sand-pump or mud-pumping device for removing sludge from a sink or a bore-hole.
    • n sludge The silt-like deposit in the bottom of an electrolytic cell.
    • ***
Chambers's Twentieth Century Dictionary
    • n Sludge sluj soft mud or mire: half-melted snow
    • ***


Webster's Revised Unabridged Dictionary
CF. Slush
Chambers's Twentieth Century Dictionary
A form of slush.


In literature:

When the flood went down, I found it near the middle of the parairy, half buried in the sludge.
"The Hunters' Feast" by Mayne Reid
On either side, a wide stretch of ground was covered by a thick deposit of sludge, from one to four feet deep.
"A Boy's Voyage Round the World" by The Son of Samuel Smiles
How deftly spreads his sludge!
"Punch, or the London Charivari Volume 98, January 4, 1890" by Various
With regard to the manurial value of the resulting sludges, much difference of opinion has existed.
"Manures and the principles of manuring" by Charles Morton Aikman
As I have said, Browning disliked Spiritualists; but that is not, our critic thinks, the reason he wrote 'Sludge the Medium.
"Gilbert Keith Chesterton" by Patrick Braybrooke
Browning's Sludge is not entirely extinct.
"Mountain Meditations" by L. Lind-af-Hageby
Let's roll him i' the sludge!
"The Wolf Patrol" by John Finnemore
Jason's appetite vanished when he tasted the sludge.
"The Ethical Engineer" by Henry Maxwell Dempsey
This drops to the bottom of the kettle as a heavy sludge entangling about 10 per cent.
"Soap-Making Manual" by E. G. Thomssen
Water slightly turbid, with layer of oil sludge on bottom.
"Fishes of Chautauqua, Cowley and Elk Counties, Kansas" by Artie L. Metcalf

In poetry:

Yet, by God's will, heavenly beauty
Owes to Heaven alone its duty;
Off ye priests, who dare adjudge
Bride, like this, to slime and sludge!
"Lita of the Nile" by Richard Doddridge Blackmore

In news:

Ontario's worst river trails garbage , sludge and toxins.
(AP) — A year ago, Richard Parnas had never heard of brown grease : sticky, stinky, remnants of sludge sucked from grease traps at restaurants, bars and commercial kitchens.
It is with intense excitement and sadness that I type this to you….the Sludge -A-Holics….the KDKB faithful listeners.
Gutbucket Sludge Test Cantaloupe Music.
T and plays in an experimental electronic duo called Sludge Butt.
Russ Johnson, of Infrastructure Alternatives, reported to the Post that there was a 500-gallon spill last week of stabilized sludge out of a holding tank at Cedarfield Community, 3592 17 Mile Road, just west of US131.
Bio Energizer® from Probiotic Solutions® is a specialized Micro Carbon Complex that is used in municipal and industrial systems to reduce sludge , odor, BOD/COD, FOG and costs in wastewater treatment plants and lagoons.
Though the sludge -lovers in California X are from Amherst, Massachusetts, both geographical connections make good sense.
The sludge that you observe is nickel salts that form over time.
A Flood of Red Sludge , One Year Later.
Steve Keller, who lost his grandson Kole to cancer, listens as attorneys discuss the EPA's discovery of toxic sludge in the former Whirlpool Park in Clyde.
Below is a release from the DOE on the cleanup of radioactive sludge .
BP Toxic Sludge was brewed to benefit birds affected by BP's Gulf oil spill.
The toxic sludge from an aluminum plant killed at least eight In this picture, the red sludge flows for miles.
Researchers at the University of Illinois have developed a new remote-controlled tool to help take the danger and dirt out of lagoon sludge detection.

In science:

Mart´ın H, Ivanova N, Kunin V, Warnecke F, Barry K, McHardy A, Yeates C, He S, Salamov A, Szeto E, et al.: Metagenomic analysis of two enhanced biological phosphorus removal (EBPR) sludge communities.
pplacer: linear time maximum-likelihood and Bayesian phylogenetic placement of sequences onto a fixed reference tree