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Which cost is mainly appear in producing freshwater from seawater?

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Which cost is mainly appear in producing freshwater from seawater?

(a) Capital cost

(b) Operating cost

(c) Optimum cost

(d) Energy cost

This question was posed to me in my homework.

This question is from Inorganic Chemical in section Inorganic Chemical Industries of Chemical Technology

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The correct answer is (d) Energy cost

Explanation: The two main costs in producing freshwater from seawater are – energy costs, fixed charges on investment. These are closely related in an economic balance. If one tries to reduce energy cost, the investment costs are invariably increased.

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