sludge return - meaning and definition. What is sludge return
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What (who) is sludge return - definition

OIL THAT SOLIDIFIED INSIDE AN ENGINE
Engine sludge; Black sludge

Sewage sludge         
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  • Sewage sludge in a beaker from a treatment plant
BY-PRODUCT OF SEWAGE TREATMENT
Surplus activated sludge; Surplus Activated Sludge; Sludge application; Land application of sludge
Sewage sludge is the residual, semi-solid material that is produced as a by-product during sewage treatment of industrial or municipal wastewater. The term "septage" also refers to sludge from simple wastewater treatment but is connected to simple on-site sanitation systems, such as septic tanks.
return         
WIKIMEDIA DISAMBIGUATION PAGE
Return (programming); Returns; Returns (disambiguation); Return (album); Return (disambiguation); Return (film); Returning (disambiguation); RETURN; Return (song)
¦ verb
1. come or go back to a place.
(return to) go back to (a state or situation).
(especially of a feeling) come back after a period of absence.
Golf play the last nine holes in a round of eighteen holes.
2. give or send back or put back in place: return the lamb to the oven and add the olives.
feel, say, or do (the same feeling, action, etc.) in response.
(in tennis and other sports) hit or send (the ball) back to an opponent.
American Football intercept (a pass, kick, or fumble by the opposing team) and run upfield with the ball.
3. yield or make (a profit).
4. (of a judge or jury) state or present (a decision or verdict) in response to a formal request.
5. (of an electorate) elect (a person or party) to office.
6. Bridge lead (a card) after taking a trick.
7. Architecture continue (a wall) in a changed direction, especially at right angles.
¦ noun
1. an act or the action of returning.
(also return match or game) a second contest between the same opponents.
a thing which has been returned, especially an unwanted ticket for an event.
2. (also return ticket) Brit. a ticket allowing travel to a place and back again.
3. (also returns) a profit from an investment.
4. an official report or statement submitted in response to a formal demand: census returns.
Law an endorsement or report by a court officer or sheriff on a writ.
5. (also carriage return) a mechanism or key on a typewriter that returns the carriage to a fixed position at the start of a new line.
(also return key) a key pressed on a computer keyboard to simulate a carriage return.
6. an electrical conductor bringing a current back to its source.
7. Architecture a part receding from the line of the front, for example the side of a house or of a window opening.
Phrases
by return (of post) Brit. in the next available mail delivery to the sender.
many happy returns (of the day) a greeting to someone on their birthday.
Derivatives
returnable adjective
returner noun
Origin
ME: the verb from OFr. returner, from L. re- 'back' + tornare 'to turn'; the noun via Anglo-Norman Fr.
Return         
WIKIMEDIA DISAMBIGUATION PAGE
Return (programming); Returns; Returns (disambiguation); Return (album); Return (disambiguation); Return (film); Returning (disambiguation); RETURN; Return (song)
·noun That which is returned.

Wikipedia

Oil sludge

Oil sludge or black sludge is a gel-like or semi-solid deposit inside an internal combustion engine, that can create a catastrophic buildup. It is often the result of contaminated engine oil and occurs when moisture and/or high heat is introduced to engine oil.