sludge

s. fango, cieno, lodo, sedimento fangoso; capa de hielo flotante

mosto, lodo, barro, fango, residuo, sedimento, cieno, pecina

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*sewage sludge = aguas residuales

lama, lodo, resíduo

(n.) = fango, lodo, pecina, sedimento residual
Ex: This is a project to incinerate an estimated 700, 000 tonnes of toxic sludge created as a byproduct of a century of steelmaking.
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* sewage sludge = pecina de las aguas residuales