Question

. A water softening plant utilizes lime and soda ash to treat water. Daily flow rate...

. A water softening plant utilizes lime and soda ash to treat water. Daily flow rate to the plant is 4.8 million liters. Calculate the daily lime (CaO) and Soda ash (Na2CO3) requirement (in Kg) to treat water. The quality of water to be treated has the following concentrations:

CO2     = 8.5 mg/l,     Ca+2       = 68.2 mg/l,     Mg+2    = 29.8 mg/l,    HCO3- = 243 mg/l.

Assume purity of CaO and Na2CO3 as 85 and 86 % respectively.

Given: Atomic Weights; C =12, Ca =40, Na =23, Mg =24, H =1, O =16

Engineering   Civil-Engineering   
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Solution) As we have to find the quantity of chemical to treat the daily water supply which is as computed as shown in the following solution-

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