Question 30 (4 points) Groundwater defined by the following analysis is to be softened by lime-soda...
Groundwater is defined by the following analysis: Ca2+ = 80 mg/L as Ca2+ Mg2+ - 55 mg/L as Mg2+ HCO3-350 mg/L as CaCO3 pH = 8.0 FORMULA CaCO3 Ca2+ Mg2+ EQUIVALENT WEIGHT (g/EW 50 20 12.2 61 HCO3 mg as CaCO3 L mg Equivalent Weight of CaCo3 (g/EW) as species X L Equivalent Weight of Species (g/EW) Noncarbonate hardness (NCH) of the raw water, in mg/L as CaCO3, is: 1) 55.0 2) 76.3 3) 135.0 4) 200.0 5) 350.0
What amount of lime, in mg/L as CaCO3, is required to soften the village of Lime Ridge's water to 80 mg/L hardness as CaCO3 Compound Concentration, mg/L as CaCO3 CO2 4.6 Ca2+ 237.9 Mg2+ 62.2 HCO3- 268 SO42- 32.1
Determine the lime and soda ask dose, in mg/L as CaCOs to soften the following water to a final hardness of 70.0 mg/L as CaCO3. The ion concentrations reported below all as CaCO3. 6-16. Determine the lime and soda ash dose, in mg/L as CaCO3 to soften the following water to a final hardness of 70.0 mg/L as CaCO3. The ion con- centrations reported below are all as CaCO2 Ca2+ 220.0 Mg2+一75.0 HCO3 265.0 CO2 17.0 Answers: Total lime addition-...
4- Giving the following analysis of groundwater, a) Construct a bar chart of the constituents, expressed as CaCO3. b) Determine the amount of lime soda as CaCO3 necessary to soften the water to 80.00 mg/L hardness CaCO3. Ion mg/L mg/L as CaCO3 Ca2+ 134 Mg2+ 7.2 Nat HCO 20.8 331.5 63.7 SO42- CL 48.1 NO2 50.5 ORP 32.3
Determine the lime and soda ash dose, in mg/l as CaCO3, to soften the following water to a final hardness of 80 mg/l as CaCO3. The ion concentrations reported below are all in mg/l as CaCO3. Ca2+ = 120 Mg2+ = 30 HCO3- = 70 CO2 = 10
1. (35 pts) The following balanced chemical equations represent the use of lime [Ca(OH)2] for softening of drinking water. First step: lime added and all CO2 precipitates as CaCO3 Ca(OH)2 + + CO2 – CaCO3 + H20 Second step: more lime added and all Ca²+ and HCO3- precipitate as CaCO3 Ca(OH)2 + Ca²+ + 2HCO3 – 2CaCO3 + 2H20 Third step: more lime added and Mg2+ and HCO3 are converted to MgCO3 which does not precipitate (also more Cacos precipitate...
3. Determine the lime and soda ash dose, in mg/L as Ca(OH)2 and Na2CO3, to soften the water of a village to a final hardness of 40.0 mg/L as CaCO3. Chemical analysis showed that the water contains Na+ (50 mg/L), Ca2+ (150 mg/L), Mg²+ (30 mg/L, HCO3 (100 mg/Las CaCO3), Cl (80 mg/L). and CO2 (5.0 mg/L).
The chemical composition of a water sample is given in the table below. The goal hardness is 80 mg/L as CaCO3 Water composition (mg/L): Ca2+ HCO3 15 SO42- Na* CO2 242 Mg2+ 56 (a) Convert the given ionic concentrations in mg/L to mg/L as CaCO3 (b) What is the total hardness, carbonate hardness and non-carbonate hardness? (C) What is the lime-soda dosage to soften the water to a hardness of 80 mg/L as CaCO3 (d) What is the annual cost...
8.13 (a) Calculate the lime dosage required for soft- ening by selective calcium removal for the following water analysis. The chemical constituents in the water are CO2 =17.6 mg/L, Ca2+ 63 mg/L, Mg 15 mg/L, Nat = CACO3, SO What is the finished-water hardness? 189 mg/L 10 mg/L 20 mg/L. Alk (HCO3 80 mg/L, and Cl 2- as
The following water quality data are available for a community Water quality Ca2+ = 60 mg/l (as species) Mg2+ = 40 mg/l (as species) HCO3- = 220 mg/l as CaCO3 CO2 = 7 mg/l (as species) pH = 7.6 Final desired hardness = 80 mg/l as CaCO3. The flow rate of the treatment plant is 0.24 m3/s. a. Calculate the total, carbonate, and non-carbonate hardness b. Calculate the amount of lime (as mg/l of CaO) needed to soften the water...