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Question
Calculate the quantity of the pure lime and soda required for softening of 1,00,000 litres of water containing the following impurities in ppm. The purity of lime is 70% and soda is BS% Ca(HCO3) = 30.2 , Mg(HCO3) = 20.8 ,CaCI2 = 28.1 ,MgCl2 = 8.78, CaSO4 = 35, MgSO4 = 6.7 .
Solution
| impurities( mg/lit) | Multification fector | CaC03 equivalent Mg/lif | Requirement |
| Ca(Hco3)=30.2 | `100/162` | `30.2 xx 100/162 = 18.64` | L |
| Mg(Hco3) =20.8 | `100/146` | `20.8 xx 100/146 = 14.24` | 2L |
| CaCl2 = 28.1 | `100/111` | `28.1 xx 100/111=25.32` | S |
| CaS04=35 | `100/136` | `35 xx 100/136 = 25.74` | S |
| MgS04 = 6.7 | `100/120` | `6.7xx 100/120=5.58` | L+S |
| MgCl2 = 8.7 | `100/95` | `8.7 xx 100/95 = 9.16` | L+S |
`"Lime" =74/100 [CaCO_3 "equivalent of" Ca (HCO_3)+ 2 xx Mg (HCO_3) + MgCI_2 xx MgSO_4 ]xx ("Volume of water")/(1000) xx 100/(%"Purity").`
`=74/100 [18.64 + 2 xx 14.25 + 9.16 + 5.58] xx (100000)/1000 xx 100/70.`
= 6541.6 gms
`"Soda" = 106/100 [CaCO_3 "equivalent of " MgCI_2 + MgSO_4 + CaSO_4 ] xx "Volum of water "/1000 xx 100/(%"Purity")`
`= 106/100 [25.31 + 9.16 +25.73 + 5.58 ] xx (100000)/1000 xx 100/85`.
= 8203 .15gms.
The lime requirement is 6541.6 gms and soda requirement is 8203. 15 gms.
RELATED QUESTIONS
Calculate the amount of lime (85% pure) and soda (95% pure) required to soften one million litre of water which contains CaCO3 = 12. 5ppml MgCO3 = 8.4ppml
CaCl2 = 22.2ppml , MgCl2 = 9.5ppml C02 = 33ppml HCI = Z3ppml organic matter= 16.Bppm
Calculate the amount of lime {80 %purity) and soda {90% purity) required for softening of 50,000 of hard water whose chemical analysis results are given below. Ca(HCO3 ) = 40.5 mg/L, Mg( HCO3)2 = 73.0 mg/L, MgSO4 = 60.0 mg/L, CaSO4 = 34.0 mg/L, CaCl2 = 27.5 mg/L and NaCI = 20.0 mg/L.
Write a note on Deccay of Concrete.
A sample of water contains following impurities :
Mg(HCO3)2 =73 mg/lit , MgSO4 = 120 mg/lit , CaCl2 = 222 mg/lit and Ca(NO3)2 = 164 mg/lit . The purity of lime is 74% and soda is 90% . Calculate the quantity of lime and soda needed for softening of 50,000 litres of water .
