4-20 4-20. Determine the lime and soda ash dose, in mg/L as CaO and Na2CO3, to soften thefollowing water to a final hardness of less than 130 mg/L as CaCO3. The ion concen-trations reported below are all mg/L as CaCO3. Assume the lime is 90% pure and thesoda ash is 97% pure.Ca2+ = 210.0 1 JAT MOSVK-0Mg2+=23.0165.0CO25.0%3D4-22. Determine the lime and soda ash dose, in mg/L as CaCO3 to soften the followingwater to a final hardness of less than 120.0 mg/L as CaCO3. If the price of lime, puichased as CaO, is $61.70 per megagram (Mg), and the price of soda ash, purchased

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Engineering

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as Cao and Na2CO3, to sof 130 mg/L as CACO3. The ic Assume the lime is 90% pu

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter3: Weight-volume Relationships And Plasticity

Section: Chapter Questions

Problem 3.1P

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Types of Composite

Composite materials are formed by merging two components that have different chemical and physical properties. The merged output is termed as a composite, whose properties are completely different from the individual components. Composite materials also have better strength than the individual components.Composite materials usually have two main parts, reinforcement material, and matrix material. The matrix material acts as a binder and surrounds the fiber of another material that bears a much higher strength. This material is known as the reinforcement material. The matrix materials are usually high-strength additives resins, while the fibers of the reinforced material can be random, oriented, and in a mat format.Composite materials are also known as fiber-reinforced composite polymers because they are composed of the polymer matrix which is reinforced to laboratory-created fibers or naturally occurring fibers, such as glass fibers, carbon fibers, or aramid fibers. Under the application of external loads, the matrix material absorbs and transfers the loads to the fibers, these fibers in return provide good compressive strength, tensile strength, and stiffness to the fiber-reinforced composite materials.Depending upon the matrix and the reinforcement material, different properties can be induced to the fiber-reinforced composite materials, including good corrosion resistance properties. The most common matrix material is the resin while the glass fibers act as the reinforcement material. Strong fibers provide strength and stiffness to the composite materials while, a soft and flexible resin provides shape to the composite materials.

Question

4-20

4-20. Determine the lime and soda ash dose, in mg/L as CaO and Na2CO3, to soften the
following water to a final hardness of less than 130 mg/L as CaCO3. The ion concen-
trations reported below are all mg/L as CaCO3. Assume the lime is 90% pure and the
soda ash is 97% pure.
Ca2+ = 210.0 1 JAT MOSVK-0
Mg2+
=23.0
165.0
CO2
5.0
%3D
4-22. Determine the lime and soda ash dose, in mg/L as CaCO3 to soften the following
water to a final hardness of less than 120.0 mg/L as CaCO3. If the price of lime, pui
chased as CaO, is $61.70 per megagram (Mg), and the price of soda ash, purchased

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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
You are asked to design a water softening system to bring following water to a final hardness if 75.0 mg/L as CaCO3. The ion concentrations reported below are all mg/L as CaCO3. Ca2+ = 240.00; Mg2+ = 90.0; HCO3- = 268.0; and CO2= 18.0 The total lime required and initial NCH are nearly 1. 330 and 268 mg/L as CaCO3 2. 376 and 62 mg/L as CaCO3 3. 330 and 27 mg/L as CaCO3 4. 376 and 268 mg/L as CaCO3
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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.
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