9-2(15 pts) Determine the alkalinity, total hardness, carbonate hardness, and non-carbonatehardness (in mg/L CaCO3) for the water (pH 7.4) with the following chemical concentrations.Calculate the doses of lime and soda ash to soften this water.Constituent Concentration, mg/LCa2+95Mg2+13.5Na25.8HCO3244SO 2-73CI67.8H2CO37.7

To determine the alkalinity, total hardness, carbonate hardness, and non-carbonate hardness for the…

Answered: 9-2 (15 pts) Determine the alkalinity,…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Note: Read the question carefully and give me right solution according to the question. I want clear solution with clear steps. A water contains 38.50 mg/L as CaCO3 of carbon dioxide, 288.00 mg/L as CaCO3 of Ca2+ and 53.00 mg/L as CaCO3 of Mg2+. All of the hardness is carbonate hardness. Using the stoichiometry of the lime soda ash softening equations, what is the daily sludge production (in dry weight, kg/day) if the plant treats water at a rate of 56.00 MGD? Assume that the effluent water contains no carbon dioxide, 30.0 mg/L as CaCO3 of Ca2+ and 10.0 mg/L as CaCO3 of Mg2+. Be sure to calculate the mass of CaCO3 and Mg(OH)2 sludge produced each day.
A water sample is tested to have an alkalinity of 300 mg/L as CaCO3. The Ca^2+ concentration is 120 mg/L as the ion, and the Mg^2+ concentration is 20 mg/L as the ion. The pH is 8.1. Find the total, carbonate, and noncarbonate hardness.
4. Lime and soda process is to be designed for the water analysis presented below, The quantity of water to be treated is 12 MGD. Estimate the total hardness, carbonate hardness and non-carbonate hardness. Determine the amount of lime and soda to soften the water to a final hardness of 95 moA as CaCO, Estimate the annual cost of softening if the cost of dry lime (CaO) is a dime per kilogram and cost of soda ash (Na-CO,) is 20 cents per kilogram (assume both compounds to be 90% pure). (AW: Ca-40, Mg-24.3, Na-23, C-12,0-16) acl Constituent mgl mg/las C&CO, Ca 12 Alkalinity CO2 150 Show transcribed image text
A water sample was tested for water hardness. A 50.00 mL sample, prepared andbuffered to pH 10, required 23.55 mL of 0.0250 M EDTA. A second 50.00 mL aliquot,prepared with NaOH, was titrated with 14.53 mL of the same EDTA solution.a. Calculate the total hardness of the water sample, express in ppm CaCO3b. Calculate the concentration of CaCO3in the sample in ppmc. Calculate the concentration of MgCO3in the sample in ppm
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 mg/L as CaCO3: Ca2+ = 120, Mg2+ = 30, HCO3 - = 70, CO2 = 10
Water analysis was carried out for a groundwater sample. The sum of the anions is equal to the sum of the cations. Calculatea) Total hardnessb) Carbonate and Non-Carbonate Hardness Hardnessc) Alkalinity
d) Calculate total hardness in ppm of a solution of both 55 mg/L Al2(SO4)3 and 45 mg/L Mg(NO3)2.
b) From the following data calculate the carbonate bicarbonate and hydroxide alkalinities." Phenolphthalein alkanity Methyl orange alkalinity mg/ CaCO, Sample Initial pH mgA CaCO, 11.1 194 315 B. 10.1 286 756 11.4 156 156 D. 7.1 256
1-7. A water contains 200 mg/L Ca, 75 mg/L Mg, 180 mg/L HCO3, and 150 mg/L. CO₂, all expressed as CaCO3. Determine the chemical dosages required to soften this water as much as possible without removing magnesium. What will the final hardness be? 1-8. If the water of Prob. 11-7 is to be softened to a final hardness of 85 mg/L as CaCO, and is not to contain more than 25 mg/L. Mg as CaCO3, find the required chemical dosages. Solve 11-7
Problem 6-13) 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 mg/L as CaCO3: Ca+2 = 120; Mg+2 = 30, HCO3- = 70, CO2 = 10.
3.1 In order to soften 6 MGD of water contains Ca²= 120 mg/L and Mg²+ = 95 mg/L, to the practical solubility limit using split treatment and with desired magnesium concentration of 40 mg/L as CaCO3. we need to treat only: a) 5.5 MGD b) 4.5 MGD c) 3.2 MGD d) 4.9 MGD Continue in the back 3.2 If an ion exchange water softener has 0.2 m' of ion-exchange resin with an exchange capacity of 75 kg/m³. The occupants use 2500 gallon/day of water. If the water contains 250 mg/L of hardness as CaCO, and it is desired to soften it to 90 mg/L as CaCO), what is the time between regeneration? a) 15 days b) 14 days c) 12 days d) 10 days 3.3 You are about to design a sand filter that has sand with a particle diameter of 0.02 inch. During filtration, the depth of the filter is 0.75 ft and the porosity is 0.25. During backwash, the porosity is expected to be 0.60. If gravel and underdrain layer is 1.6 ft and free board is 2 ft, the total depth of the filter will be: a) 3.5 ft b) 5.0 ft c) 8.5 ft d) 9.5 ft…
Total hardness (TH) of the raw water is ________ mg/L as CaCO3. a) 55.0b) 226.3 c) 426.3 d) 80.0 e) 22.6 The Carbonate Hardness (CH) of the raw water is _________ mg/L as CaCO3. a) 80 b) 135.0 c) 200.0 d) 350.0 e) 55.0

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