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प्रश्न
In a filtration, plant water is filtered using layers of
विकल्प
sand and clay
clay and fine gravel
sand and fine gravel
sand, fine gravel and medium gravel
उत्तर
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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