Q. Calculate the regenerant flow required for the softener system with the given below data.

Calcium Load: 85 ppm as CaCO₃
Capacity: 37 Kg/m³
Correction factor: 0.9
Flow rate: 135 m³/hr
Operation hours: 20 hrs

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Q. Calculate the rinse volume of the regenerant liquid for the softener system with the given below data.

Calcium Load: 60 ppm as CaCO₃
Capacity: 37 Kg/m³
Correction factor: 0.9
Flow rate: 35 m³/hr
Operation hours: 10 hrs

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Q. Calculate the fast rinse period of the regenerant liquid for a softener system with the given below data.

Calcium Load: 40 ppm as CaCO₃
Capacity: 37 Kg/m³
Correction factor: 0.9
Flow rate: 235 m³/hr
Operation hours: 10 hrs

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Q. In which year was the Ferrosand process patented?

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

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

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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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