Determine the chemical dosages for softening the following water
to the practical solubility limits using the excess lime – soda ash
process. Assume that the minimum excess lime of 20 mg/L as CaCO3 is
selected. Express the chemical dosages in both mg/L as CaCO3 and
mg/L as the species (i.e. Ca(OH)2 or Na2CO3). Find the
total lime used and soda ash used as mg/L as CaCO3
and and mg/L as the species. Answer: Lime =
295.5 mg/L as CaCO3 and Soda ash = 95.6 mg/L as
CaCO3.
Determine The Chemical Dosages For Softening The Following Water To The Practical Solubility Limits Using The Excess Lim 1 (130.25 KiB) Viewed 27 times
Problem #5 Determine the chemical dosages for softening the following water to the practical solubility limits using the excess lime soda ash process. Assume that the minimum excess lime of 20 mg/L as CaCO3 is selected. Express the chemical dosages in both mg/L as CaCO3 and mg/L as the species (i.e. Ca(OH)2 or Na₂CO3). Constituent mg/L EW meq/L MW (g/mole) EW CaCO3/EW species mg/L as CaCO3 CO₂ Ca²+ 2+ Mg2+ Nat Alkalinity C1- SO4²- 2- 9.6 44.0 95.2 40.0 13.5 24.3 25.8 23.0 67.8 35.5 76.0 96.0 198.0 3.96
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