In: Civil Engineering
A water with a pH =7.0 has been analyzed and found to
have the following composition, with all concentration in mg/L as
CaCO3:
CO2 = 125 mg/L
Ca2+ = 250 mg/L
Mg2+ = 80 mg/L
Fe2+ = 10 mg/L
Alkalinity = 260 mg/L
SO4 2- = 50 mg/L
Cl- = 30 mg/L
a) what is the hardness of this water? Report in mg/L as
CaCO3
b) use the excess Lime soda Ash method and estimate the kilograms
of lime and kilograms of soda Ash that will be needed per 1MGD to
soften this water. Report assumptions used in the calculations.