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Which of the following factors doesn’t need to be considered in order to make the system of nutrient removal cost effective?

(a) Waste water type

(b) Space

(c) Production rate

(d) Water volume

The question was posed to me in a national level competition.

I'd like to ask this question from Biological Treatment of Waste Water in chapter Biological Treatment of Waste Water of Environmental Biotechnology

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Correct option is (d) Water volume

Easiest explanation: Waste water type determination helps to determine the type of treatment, space is required to ensure that proper area is available for efficient treatment and production rate is important in order to make the system cost effective, whereas, water volume is not a major concern because any volume of water can be and should be treated and it doesn’t affect the cost.

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