Question

Define the term sludge.​

Answer 1

Answer:

Sludge is a semi-solid slurry that can be produced from a range of industrial processes, from water treatment, wastewater treatment or on-site sanitation systems. ... Industrial wastewater treatment plants produce solids that are also referred to as sludge.

Answer 2

Answer:

it is an unattractive muddy shade of brown or green.

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