Homework Answers
The dose of lime = 150 mg/(40 g/mol) * 74 g/mol = 277.5 mg
Therefore, the dose of lime = 277.5 mg/L as Ca(OH)2
The dose of soda ash = 1/2 * 50 mg/(23 g/mol) * 106 g/mol = 115.2 mg
Therefore, the dose of soda ash = 115.2 mg/L as Na2CO3
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3. Determine the lime and soda ash dose, in mg/L as Ca(OH)2 and Na2CO3, to soften...
Determine the lime and soda ash dose, in mg/l as CaCO3, to soften the following water...
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
Determine the lime and soda ask dose, in mg/L as CaCOs to soften the following water...
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-...
2. Calculate the amount of lime as Ca(OH)2 (90% pure) and soda ash (93% pure) (each...
2. Calculate the amount of lime as Ca(OH)2 (90% pure) and soda ash (93% pure) (each chemical in lb/d) needed to soften the following water using the two-stage excess lime-soda ash treatment process designed for an average daily flow of 4.0 mgd. 15 mg/L as CO2 CO2 Ca2+ 60 mg/L 24 mg/L Na 46 mg/L HCO3 = 200 mg/L 96 mg/L 35 mg/L = CF
1e. What amount of lime and/or soda ash, in mg/L as CaCO3, is required 6-19 to...
1e. What amount of lime and/or soda ash, in mg/L as CaCO3, is required 6-19 to soften the Village of Zap's water to 80.0 mg/L hardness as CaCO3? Compound CO2 Ca2+ Mg нсоз Concentration, mg/L as CaCO3 44.2 87.4 96.3 204.6 73.8 SO so
What amount of lime, in mg/L as CaCO3, is required to soften the village of Lime...
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
QUESTION 3 Given the following information determine the annual chemical cost to soften the water in...
QUESTION 3 Given the following information determine the annual chemical cost to soften the water in a treatment plant. Water flow rate = 0.04 m3/s Ca2+ = 167 mg/L as CaCO3 Mg2+ = 21 mg/L as CaCO3 HCO3 = 167+21 mg/L as CaCO3 CO2 = 7 mg/L as CaCO3 Cost of lime (purchased as Cao)= 76.7 per megagram (Mg) Cost of soda ash (purchase as Na2CO3) = 261.1 per megagram (Mg) Assume the lime is 90 percent pure and soda...
The chemical composition of a water sample is given in the table below. The goal hardness...
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...
The following water quality data are available for a community Water quality Ca2+ = 60 mg/l...
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...
. 5 points. Using Eq. 4-17 (shown below) calculate the dose of calcium hydroxide in mg...
. 5 points. Using Eq. 4-17 (shown below) calculate the dose of calcium hydroxide in mg Ca(OH)2/L needed to remove the magnesium in a water containing 124 mg MgCl2/L. Ignore subsequent soda ash requirements to remove the added calcium Hint: use one mole of lime per mole of magnesium. Note: this is non-carbonate hardness . 5 points. Briefly explain the formation of "soap scum" in terms of the chemical elements in hard water and "natural" soap. Ca2* Na2CO3 CaCO3(s)2 Na*...
(15 pts) Calculate the lime and soda ash for Hardness removal of a water with the following water chemistry: CO2/H2CO3 = 0.7 meq/L Ca(HCO3)2 3.5 meq/L CaSO4 = 1.8 meq/L MgS04 2.0 meq/L 1. (...
(15 pts) Calculate the lime and soda ash for Hardness removal of a water with the following water chemistry: CO2/H2CO3 = 0.7 meq/L Ca(HCO3)2 3.5 meq/L CaSO4 = 1.8 meq/L MgS04 2.0 meq/L 1.
(15 pts) Calculate the lime and soda ash for Hardness removal of a water with the following water chemistry: CO2/H2CO3 = 0.7 meq/L Ca(HCO3)2 3.5 meq/L CaSO4 = 1.8 meq/L MgS04 2.0 meq/L 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-...
2. Calculate the amount of lime as Ca(OH)2 (90% pure) and soda ash (93% pure) (each chemical in lb/d) needed to soften the following water using the two-stage excess lime-soda ash treatment process designed for an average daily flow of 4.0 mgd. 15 mg/L as CO2 CO2 Ca2+ 60 mg/L 24 mg/L Na 46 mg/L HCO3 = 200 mg/L 96 mg/L 35 mg/L = CF
1e. What amount of lime and/or soda ash, in mg/L as CaCO3, is required 6-19 to soften the Village of Zap's water to 80.0 mg/L hardness as CaCO3? Compound CO2 Ca2+ Mg нсоз Concentration, mg/L as CaCO3 44.2 87.4 96.3 204.6 73.8 SO so
QUESTION 3 Given the following information determine the annual chemical cost to soften the water in a treatment plant. Water flow rate = 0.04 m3/s Ca2+ = 167 mg/L as CaCO3 Mg2+ = 21 mg/L as CaCO3 HCO3 = 167+21 mg/L as CaCO3 CO2 = 7 mg/L as CaCO3 Cost of lime (purchased as Cao)= 76.7 per megagram (Mg) Cost of soda ash (purchase as Na2CO3) = 261.1 per megagram (Mg) Assume the lime is 90 percent pure and soda...
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...
. 5 points. Using Eq. 4-17 (shown below) calculate the dose of calcium hydroxide in mg Ca(OH)2/L needed to remove the magnesium in a water containing 124 mg MgCl2/L. Ignore subsequent soda ash requirements to remove the added calcium Hint: use one mole of lime per mole of magnesium. Note: this is non-carbonate hardness . 5 points. Briefly explain the formation of "soap scum" in terms of the chemical elements in hard water and "natural" soap. Ca2* Na2CO3 CaCO3(s)2 Na*...
(15 pts) Calculate the lime and soda ash for Hardness removal of a water with the following water chemistry: CO2/H2CO3 = 0.7 meq/L Ca(HCO3)2 3.5 meq/L CaSO4 = 1.8 meq/L MgS04 2.0 meq/L 1.
(15 pts) Calculate the lime and soda ash for Hardness removal of a water with the following water chemistry: CO2/H2CO3 = 0.7 meq/L Ca(HCO3)2 3.5 meq/L CaSO4 = 1.8 meq/L MgS04 2.0 meq/L 1.
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