How does the precipitation process work to control water pollution?

precipitation is a useful method to
1. heavy metals
2.light pollutants
3. all metals

pollutants that have become insoluble solids after chemical precipitation are removed
1. biological action
2.filtration
3. air sparging

First: 1- Heavy Metals

Second: 2- Filtration

Explanation:

In the case of polluted water treatment, the removal of heavy metals can be done by various processes, one of which is chemical precipitation. Precipitation is a process in which a solid forms during the chemical reaction, this solid formed is called a precipitate. Interestingly, the method by which the precipitate is removed, is the filtration process that answers the second item of the question.

wheres the options ? : (

explanation: