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How is industrial wastewater treated? What common equipment is usually used?
As far as I know, you need some heavy-duty machinery to treat contaminated water that was used in factories. You should read some thematic resources.
Depending on the exact contaminants present in your wastewater, the equipment and techniques used may change. One of the more common machines for water treatment is a clarifier, which desalinates water and clears it from particles, forming a slurry that is dealt with using other equipment. You can commonly see clarifiers in big industrial plants that deal with chemicals or metallurgy.