sludge

US /slʌdʒ/
UK /slʌdʒ/
"sludge" picture
1.

boue, fange, cambouis

thick, soft, wet mud or a similar viscous mixture of liquid and solid components, especially the product of an industrial or refining process.

:
The riverbed was covered in thick, black sludge.
Le lit de la rivière était recouvert d'une épaisse boue noire.
Waste water treatment plants produce a lot of sewage sludge.
Les stations d'épuration produisent beaucoup de boues d'épuration.