A mechanical means of treating industrial effluents is called _______.

Sedimentation

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Rainwater harvesting

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Recycling of waste water

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None of these

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Solution

The correct option is A Sedimentation
Treatment of industrial effluents can be done in three phases.
(a) Primary treatment by mechanical means. This involves screening, grinding, flocculation, and sedimentation.
(b) Secondary treatment by biological process.
(c) Tertiary treatment by biological, chemical and physical processes. This involves recycling of wastewater.

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