The removal of Giardia cysts from a soft, cold, low-turbidity water requires 15 mg/l of alum plus 0.10 mg/l of anionic polymer,
(a) How many milligrams per liter of natural alkalinity are consumed in the coagulation reaction? How much carbon dioxide is released by this reaction?
(b) What is the stoichiometric dosage of soda ash to react with the 15 mg/l of alum? This reduces loss of alkalinity but still produces carbon dioxide. How much carbon dioxide is released by this reaction?
(c) Would a stoichiometric dosage of lime slurry be better than soda ash? Suggest a reason why lime slurry would not be used. How can carbon dioxide be removed from water?
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