Question 431. When the hardness and alkalinity are around 30% what should be used?

Question 432. The treatment system includes a WAC, SAC, followed by a WBA and SBA. There is a degasser in this system. Calculate the amount of SBA resin required for the following data.
M Alkalinity: 100 ppm as CaCO₃
P Alkalinity: 100 ppm as CaCO₃
Silica: 30 ppm as CaCO₃
CO₂: 45 ppm as CaCO₃
EMA: 100 ppm as CaCO₃
Capacity: 37 Kg/m³
Correction factor: 0.9
Flow rate: 35 m³/hr
Operation hours: 10 hrs

Question 433. The treatment system includes a WAC, SAC, followed by a WBA and SBA. There is no degasser in this system. Calculate the amount of resin required for the following information.
M Alkalinity: 100 ppm as CaCO₃
P Alkalinity: 100 ppm as CaCO₃
Silica: 45 ppm as CaCO₃
CO₂: 45 ppm as CaCO₃
Capacity: 37 Kg/m³
Correction factor: 0.9
Flow rate: 35 m³/hr
Operation hours: 10 hrs

Question 434. The treatment system consists of a WAC, SAC which is followed by a WBA and SBA. Calculate the amount of WBA resin required for the following data.
M Alkalinity: 100 ppm as CaCO₃
P Alkalinity: 100 ppm as CaCO₃
EMA: 25 ppm as CaCO₃
Capacity: 37 Kg/m³
Correction factor: 0.9
Flow rate: 135 m³/hr
Operation hours: 20 hrs

Question 435. ________ is the removal of calcium, magnesium and certain other metal cations in hard water.

Question 436. Soft water can foul plumbing.

Question 437. What is the permitted concentration of manganese in drinking water?

Question 438. In which year was the Ferrosand process patented?

Question 439. What is the minimum time of aeration?

Question 440. What is the permitted concentration of iron in drinking water?