In a filtration, plant water is filtered using layers of

(a) sand and clay.

(b) clay and fine gravel.

(c) sand and fine gravel.

(d) sand, fine gravel and medium gravel.

Question

In a filtration, plant water is filtered using layers of

(a) sand and clay.

(b) clay and fine gravel.

(c) sand and fine gravel.

(d) sand, fine gravel and medium gravel.

MyClass24 · Accepted Answer

Soln:
The answer is (d) sand, fine gravel and medium gravel.
Explanation:
During wastewater treatment wastewater is allowed to enter a grit of sand, fine gravel and medium gravel. Here the speed of wastewater is slowed down to allow sand, fine gravel and medium gravel to settle down.

In a filtration, plant water is filtered using layers of (a) sand and clay. (b) clay and fine gravel. (c) sand and fine gravel. (d) sand, fine gravel and medium gravel.