Question

How can we treat heavy metals in rivers and streams?

Answer 1

Chemicals can be used to treat heavy metals.

Explanation:

Let me start with Metal (+2) (such as zinc) and Ca(OH)2 in water.

At the end of reaction,

Metal + Ca(OH)2 --> Me(OH)2 + `Ca^(+2)`

Now you have solid form (of Me(OH)2).

You can also use chemical oxidation, using hydrogen peroxide and ultraviolet light, ozone, etc. to remove heavy metals in water.