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
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Answer:
c
Explanation:
An aeration tank
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Answer: An aeration tank
Explanation: