Question

What is a Facultative pond?

(a) Top layer is anaerobic

(b) Bottom layer is aerobic

(c) Aerobic throughout depth

(d) Top layer is aerobic

The question was posed to me by my college director while I was bunking the class.

The question is from Disposal of Effluent in section Effluent Treatment of Bioprocess Engineering

Answer 1

Correct choice is (d) Top layer is aerobic

To elaborate: The most often used ponds in domestic wastewater treatment are the stabilization pond and facultative lagoon. The stabilization pond is designed to be aerobic throughout its depth and the facultative lagoon will be anaerobic at the bottom and aerobic at the top.