Final answer:
Industries use chemical precipitation to remove hazardous chemicals from wastewater. Chemicals are added to the wastewater which cause the hazardous substances to form insoluble precipitates that can be easily separated from the water.
Step-by-step explanation:
Industries use precipitation to remove hazardous chemicals from wastewater through a process called chemical precipitation.
In this process, chemicals are added to the wastewater which causes the hazardous substances to form insoluble precipitates. These precipitates can then be removed from the wastewater through sedimentation or filtration.
For example, when heavy metals like mercury or lead are present in the wastewater, chemicals like lime or sodium hydroxide are added which react with the metals to form insoluble metal hydroxide precipitates that can be easily separated from the water.
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