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Question
In a filtration, plant water is filtered using layers of
Options
sand and clay
clay and fine gravel
sand and fine gravel
sand, fine gravel and medium gravel
Solution
sand, fine gravel and medium gravel
Explanation:
In wastewater treatment, waste¬water is allowed to enter a grit and sand removal tank. Here, the speed of wastewater is reduced in order to allow sand, grit and pebbles to settle down.
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