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ADD lime No 20 mg/L Add Soda- NCH to be removed Yes Yes Is Mg 40 mg/L? IN (Mg2+ -40) 207 No ADD lime (Mg2+ 40) there NCH to be removed? No No ADD lime- (Mg2+ IN (Mg2+40) 407 Yes ADD lime 40 mg/L. Stop

ADD lime No 20 mg/L Add Soda- NCH to be removed Yes Yes Is Mg 40 mg/L? IN (Mg2+ -40) 207 No ADD lime (Mg2+ 40) there NCH to be removed? No No ADD lime- (Mg2+ IN (Mg2+40) 407 Yes ADD lime 40 mg/L. Stop

Structural Analysis
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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The total dose for Lime, in mg/L as CaCO3, is:

a) 576

b) 476

c) 226

d) 350

e) 200

 

The total dose for Soda Ash, in mg/L as CaCO3, is:

a) 46

b) 26

c) 6

d) 36

e) 16

 

Groundwater is defined by the following analysis: Ca²+ = 80 mg/L as Ca²+ 2+ Mg²+ = 55 mg/L as Mg²+ 2+ HCO3 =350 mg/L as CaCO3 pH = 8.0 The target total hardness is 80 mg/L as CaCO3, in which carbonate hardness, CH = 40 mg/L as CaCO3 FORMULA EQUIVALENT WEIGHT (g/EW) CaCO3 50 Ca²+ 20 Mg²+ 12.2 HCO3 mg L -as CaCO3 = mg L as species X 61 Equivalent Weight of CaCO3 (g/EW) Equivalent Weight of Species (g/EW)
Transcribed Image Text:Groundwater is defined by the following analysis: Ca²+ = 80 mg/L as Ca²+ 2+ Mg²+ = 55 mg/L as Mg²+ 2+ HCO3 =350 mg/L as CaCO3 pH = 8.0 The target total hardness is 80 mg/L as CaCO3, in which carbonate hardness, CH = 40 mg/L as CaCO3 FORMULA EQUIVALENT WEIGHT (g/EW) CaCO3 50 Ca²+ 20 Mg²+ 12.2 HCO3 mg L -as CaCO3 = mg L as species X 61 Equivalent Weight of CaCO3 (g/EW) Equivalent Weight of Species (g/EW)
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. ADD lime - CO₂ ADD lime = HCO, No Is Mg2+ ADD lime (Mg2+ 40 mg/L? No IN (Mg2+40) = 207 (Mg²+ 40) > 40? No Yes ADD lime- (Mg2+ 40) ADD lime 40 mg/L there NCH to be removed? ADD lime-20 mg/L Yes Add Soda - NCH to be removed Yes No Stop
Transcribed Image Text:Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. ADD lime - CO₂ ADD lime = HCO, No Is Mg2+ ADD lime (Mg2+ 40 mg/L? No IN (Mg2+40) = 207 (Mg²+ 40) > 40? No Yes ADD lime- (Mg2+ 40) ADD lime 40 mg/L there NCH to be removed? ADD lime-20 mg/L Yes Add Soda - NCH to be removed Yes No Stop
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