Question

when wastewater is treated, the process of clumps being allowed to settle is called ________.
a coagulation
b sedimentation
c filtration

Explanation:

• Coagulation is the process of clumping particles together, not settling.
• Sedimentation is the process where clumps (or suspended solids) settle out of water by gravity, which matches the description.
• Filtration uses a medium to trap particles, not settling.

Answer:

b. sedimentation