Q. What is the permitted concentration of arsenic in drinking water?

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Q. What is the minimum time of aeration?

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Q. What is the tank volume of aeration for water flow of 50 m³/h?

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Q. At what pH should the water be maintained?

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Q. The aeration system will decrease the redox potential of the water.

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Q. What is the minimum required redox potential of water?

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Q. Manganese oxidation requires a high oxidation potential.

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Q. What is the desirable bed depth for AFM filtration?

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Q. What is the maximum allowable flow for backwash?

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Q. If the water is brown in colour it indicates the presence of which of these?

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Q. How is Iron removed?

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Q. What is the safe limit for iron in the water?

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Q. What is the safe limit for manganese in water?

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Q. What is the method used to delay the precipitation of oxidized manganese and iron?

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Q. What is the concentration of dissolved oxygen required to oxidize 1 ppm of iron?

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Q. What is the concentration of dissolved oxygen required to oxidize 1 ppm of manganese?

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Q. Which of these methods is not used for the removal of arsenic?

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Q. Considering the total cost which of these is the most expensive method to remove arsenic?

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Q. Which of these is the most efficient method to remove arsenic?

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Q. Which is the common indicator organism used in the evaluation of drinking water?

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