Question

it is possible to reduce river pollution by the use of sewage water for irrigation Importance

Answer 1

yes it is possible to reduce river pollution by the use of sewage water for irrigation _

it pures the impure water.
it saves water.
it is used in factories .

Answer 2

Usually, the sewage water enters into the river cause the water pollutions.

But the filtered sewage water can be used for some other purposes, and it will not cause any water pollution if it enters into the river water.

So this is the best way to prevent the water pollutions.