Which of the following is the main objective of primary wastewater treatment?
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A.
To use biological processes to break down organic matter
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B.
To remove all bacteria and viruses from the water
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C.
To remove floating materials and settleable solids
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D.
To add chemicals to disinfect the water
Correct Answer:
C. To remove floating materials and settleable solids
Explanation:
Primary wastewater treatment is a mechanical process that uses gravity and physical methods like sedimentation and skimming to remove settleable solids and floating materials such as grease, oils, and scum. By slowing the flow of water in clarifiers or settling tanks, heavier organic and inorganic particles sink to the bottom as sludge, while lighter substances rise to the surface to be skimmed off. This stage is crucial for reducing the total suspended solids (TSS) and biochemical oxygen demand (BOD) before the water undergoes more advanced biological or chemical processes in secondary treatment.
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