Question

A group of students make a filtration system using layers of fine sand, coarse sand and gravel and test it in the lab, using 500mL of wastewater sample. In order to upscale their design, they add a settling tank after the filter. What should they add before their filtration system?

1 point



a) A wire mesh

b) Disinfectants

c) An aeration tank

d) A mechanical skim​

Answer 1

Answer:

c

Explanation:

An aeration tank

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Answer 2

The correct answer is option (c) An aeration tank.

Explanation:

• They should add an aeration tank before their filtration system.
• An activated sludge process where air is added into the water to encourage microbial growth is referred as an Aeration tank.
• It provides oxygen to bacteria for treating and stabilizing the wastewater.
• The supplied oxygen is then utilised by bacteria in the wastewater to break down the organic matter which contains carbon to form carbon dioxide and water.