Question

______ are formed in filters due to insufficient washing of sand grains.

(a) Sand boils

(b) Mud balls

(c) Clogging

(d) Bubbles

This question was posed to me in my homework.

I'd like to ask this question from Problems in Filter Operation in division Filtration of Environmental Engineering

Answer 1

Correct answer is (b) Mud balls

For explanation I would say: Mud balls are formed in filters due to insufficient washing of sand grains. Mud accumulates on the sand surface and form a dense mat.