Groundwater is defined by the following analysis: Ca2+ = 80 mg/L as Ca2+ Mg2+ - 55...
Question 30 (4 points) Groundwater defined by the following analysis is to be softened by lime-soda ash treatment. The target total hardness is 90 mg/L as CaCO3, in which CH = 40 mg/L as CaCO3 CO2 = 30 mg/L as CO2 = 120 mg/L as Ca2+ Ca2+ Mg2+ = 48 mg/L as Mg2+ Nat = 46 mg/L as Nat HCO3 = 200 mg/L as Cacos SO42- 96 mg/L as SO42- 35 mg/L as CI FORMULA CO2 CaCO3 EQUIVALENT WEIGHT (S/EW)...
For the water analysis given below, with pH = 8, find the following in ``mg/l as CaCO3``: total hardness carbonate hardness noncarbonate hardness Cations mg/l Anions mg/l Na+ 20 Cl- 40 K+ 40 HCO3- 47 Ca2+ 10 CO32- 10 Mg2+ 10 SO4-2 5 Fe2+ 2 NO3- 10
Ca(OH)2 is added to water to reach a concentration of 53 mg/L. Initially, the water had 3.09 mg/L of Mg2+ and it reacts with Ca(OH)2 according to equation 61a. Assume SO4-2 is in excess. What are the final dissolved Ca2+and Mg 2+ concentrations? What is the initial and final hardness? What is the Mg(OH)2 precipitate concentration? (28.6 mg/L, 0 mg/L, 12.5 mg CaCO3/L, 71.5 mg CaCO3 /L, 7.28 mg/L). Precipitation of noncarbonate Mg, leaving Ca from lime in solution. Mf+...
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...
If a sample of tap water contains 400 ppm of Ca2+ and 80 ppm of Mg2+, what is the hardness of this water sample in terms of equivalent concentration CaCO3, in mg/L?
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
1. The major ions in a groundwater sample were found to be the following: [Ca2+] = 75 mg/L [Mg2+] = 40 mg/L [Na+] = 10 mg/L [HCO3-] = 300 mg/L, [CI] = 10 mg/L [SO42-] = 109 mg/L. (a) Calculate the concentration of each ion in molar units (e.g., M or mM) and equivalents per liter (Equivalents in this case is defined as the absolute value of the ion charge for 1 mole of the ion). (b) All environmental aqueous...
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
3. For the water analysis given below, with pH = 8, find the following in mg/l as CaCO3 a) total hardness b) carbonate hardness c) noncarbonate hardness mg/l Cations Na* K* mg/ 20 40 Anions CI- НСО, 40 47 Ca2 CO2 SO-2 Mo- 10 NO
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-...