You need to soften water at a 20 MGD potable water treatment facility using lime (Ca(OH)2) and soda ash (Na2CO3). Chemical analysis of the water revealed the constituent concentrations in the table below. ConcentrationMolecular WeightCO26mg/L44g/molCa2+20mg/L40g/molMg2+10mg/L24.4g/molNa+5mg/L23g/molAlkalinity105mg/L100g/molSO42-4mg/L96g/molCl-7mg/L35.5g/mol What is the Carbonate Harness (concentration) in this system?Calculate the quantity of softening materials required on a daily basis for and excess lime treatment process (assume 24 hr operation).

Making a table: Equivalent weight Concentrationeqivalent weight Concentrationeqivalent…

You need to soften water at a 20 MGD potable water treatment facility using lime (Ca(OH)2) and soda ash (Na2CO3). Chemical analysis of the water revealed the constituent concentrations in the table below

You need to soften water at a 20 MGD potable water treatment facility using lime (Ca(OH)2) and soda ash (Na2CO3). Chemical analysis of the water revealed the constituent concentrations in the table below

Solid Waste Engineering

3rd Edition

ISBN:9781305635203

Author:Worrell, William A.

Publisher:Worrell, William A.

Chapter5: Separation Processes

Section: Chapter Questions

Problem 5.13P

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Question

You need to soften water at a 20 MGD potable water treatment facility using lime (Ca(OH)₂) and soda ash (Na₂CO₃). Chemical analysis of the water revealed the constituent concentrations in the table below.

	Concentration	Molecular Weight
CO₂	6	mg/L	44	g/mol
Ca²⁺	20	mg/L	40	g/mol
Mg²⁺	10	mg/L	24.4	g/mol
Na⁺	5	mg/L	23	g/mol
Alkalinity	105	mg/L	100	g/mol
SO₄^2-	4	mg/L	96	g/mol
Cl^-	7	mg/L	35.5	g/mol

What is the Carbonate Harness (concentration) in this system?
Calculate the quantity of softening materials required on a daily basis for and excess lime treatment process (assume 24 hr operation).

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