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Assign_2-2_Solutions

# Assign_2-2_Solutions - calcium hardness(express results in...

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Lime and Soda Ash Dosage Calculations Problem #1 Your are given a water with the above water composition at a flow rate of 2 mgd. 1.a What is the Carbonate hardness for this water sample? Express as meq/L. Express as mg-CaCO 3 ?\/L.

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1.b. How much lime must be added to remove the carbonate hardness (express as pounds of mg-Na(OH) 2 per day) and assume a 90 % purity of the commercial product. Ca ++ +2 HCO 3 - + Ca(OH) 2 ÍÎ CaCO 3 +2 H 2 O

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1.c How much soda ash would you need to completely remove the noncarbonated
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Unformatted text preview: calcium hardness (express results in pounds of soda ash per day). Assume a commercial product purity of 92%. 1.d How much more lime would you need to remove all the magnesium hardness ? (neglect excess dosage and assume 90% purity). Express results as lbs per day. 1.e What are the problems (2) with the soft water you just made. pH too high-corrosive Too soft-corrosive...
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Assign_2-2_Solutions - calcium hardness(express results in...

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