What is the first physical barrier in water treatment that removes large debris?

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Multiple Choice

What is the first physical barrier in water treatment that removes large debris?

Explanation:
Screening is the first physical barrier because it uses barriers like bars or screens to physically remove large solids from the water right at the intake or early in the treatment train. This protects pumps and downstream equipment and reduces the solids load before chemical treatment or finer filtration step in the process. After screening, water typically undergoes chemical pretreatment (coagulation/flocculation), then sedimentation, filtration, and finally disinfection. The other options involve chemical addition or later-stage treatment and aren’t about removing large debris at the start.

Screening is the first physical barrier because it uses barriers like bars or screens to physically remove large solids from the water right at the intake or early in the treatment train. This protects pumps and downstream equipment and reduces the solids load before chemical treatment or finer filtration step in the process. After screening, water typically undergoes chemical pretreatment (coagulation/flocculation), then sedimentation, filtration, and finally disinfection. The other options involve chemical addition or later-stage treatment and aren’t about removing large debris at the start.

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