Which of the following is the first step in the public water treatment process?

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Multiple Choice

Which of the following is the first step in the public water treatment process?

Screening is the first step because it physically removes large solids and debris right at the water’s intake, protecting pumps and downstream treatment processes from clogging, abrasion, and fouling. By catching leaves, sticks, gravel, and other bulky material early, the plant prevents these items from interfering with chemical dosing, mixing, and subsequent treatment stages. Once solids are removed, the water typically moves on to rapid mixing and coagulation/flocculation to form flocs, then sedimentation to let those flocs settle, followed by filtration, disinfection, and finally pumping to the distribution system. If debris weren’t removed first, coagulation could be hindered, filtration could clog quickly, and overall treatment efficiency would drop.

Screening is the first step because it physically removes large solids and debris right at the water’s intake, protecting pumps and downstream treatment processes from clogging, abrasion, and fouling. By catching leaves, sticks, gravel, and other bulky material early, the plant prevents these items from interfering with chemical dosing, mixing, and subsequent treatment stages.

Once solids are removed, the water typically moves on to rapid mixing and coagulation/flocculation to form flocs, then sedimentation to let those flocs settle, followed by filtration, disinfection, and finally pumping to the distribution system. If debris weren’t removed first, coagulation could be hindered, filtration could clog quickly, and overall treatment efficiency would drop.

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