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15. A water intended to be drinkable has a COD value of 30mgO2L1. If an aeration process is used to reduce this value to 5mgO2L1,

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15. A water intended to be drinkable has a COD value of 30mgO2L1. If an aeration process is used to reduce this value to 5mgO2L1, calculate the volume of air, measured under normal conditions, that will need to be injected every hour if the flow of water to be treated is 1800m3h1. Consider that air contains 21% oxygen. (Solution: 150m3/h )

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