noun
a substance that is thick and viscous, typically a byproduct of industrial processes containing acidic components
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The industrial plant disposed of the acid sludge in a secure and environmentally friendly manner.
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They had to clean up the acid sludge spill before it caused any damage.
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I can't believe they dumped all that acid sludge into the river!
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The toxic relationship left behind an emotional acid sludge that took time to clean up.