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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
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उत्तर
sand, fine gravel and medium gravel
Explanation:
In wastewater treatment, wastewater 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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