Q. Calculate the theoretical softener resin bed depth for the following data:

Magnesium Load: 130 ppm as CaCO₃
Capacity: 47 Kg/m³
Correction factor: 0.9
Flow rate: 135 m³/hr
Operation hours: 20 hrs
Linear velocity: 16.6 m³/h/ m³
Space velocity: 20 m³/h/ m³

View solution

Q. Calculate the area of the softener vessel required for the following information.

Magnesium Load: 180 ppm as CaCO₃
Capacity: 47 Kg/m³
Correction factor: 0.9
Flow rate: 135 m³/hr
Operation hours: 20 hrs
Linear velocity: 16.6 m³/h/ m³
Space velocity: 20 m³/h/ m³

View solution

Q. Calculate the diameter of the softener vessel required for the below given data.

Magnesium Load: 500 ppm as CaCO₃
Capacity: 57 Kg/m³
Correction factor: 0.9
Flow rate: 135 m³/hr
Operation hours: 20 hrs
Linear velocity: 16.6 m³/h/ m³
Space velocity: 20 m³/h/ m³

View solution

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

Magnesium Load: 10 ppm as CaCO₃
Capacity: 47 Kg/m³
Correction factor: 0.9
Flow rate: 135 m³/hr
Operation hours: 20 hrs

View solution

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

View solution

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

View solution

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

View solution

Q. In which year was the Ferrosand process patented?

View solution

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

View solution

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

View solution

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

View solution

Q. What is the minimum time of aeration?

View solution

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

View solution

Q. At what pH should the water be maintained?

View solution

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

View solution

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

View solution

Q. Manganese oxidation requires a high oxidation potential.

View solution

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

View solution

Q. What is the maximum allowable flow for backwash?

View solution

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

View solution