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Which of the following techniques is environment friendly and cost effective?

(a) Physical

(b) Chemical

(c) Biological

(d) Combination of physical and chemical

The question was asked in examination.

Question is from Microalgal Culture topic in portion Biotechnological Approaches of Microalgal Culture of Environmental Biotechnology

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Best answer
Right choice is (c) Biological

Easy explanation: Biological purification technique of waste water is environment friendly and cost effective whereas Chemical, Physical or a Combination of physical and chemical is efficient but can cause secondary pollution.

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