Download - ASCE TEXAS 2013 centennial
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Sustainable Utilization of RO By-
Product Solids
By
Bijoy Krishna Halder, Vivek Tandon, Anthony Tarquin,
Guillermo Delgado
The University of Texas at El Paso
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Agenda
Introduction
Challenges
Objective
Material Used
Micro Scale Test
Sample Preparation and Curing Condition
Compressive Strength Test
Conclusion
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Introduction
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Introduction
• Water is an important resource.
• To produce potable water, various techniques e.g. desalination
is used.
• One desalination process is The Concentrate Enhanced
Recovery Reverse Osmosis (CERRO©)
• However this process yield high concentration CaSO4 as RO
by-product.
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Challenges
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Challenges
The disposal of this waste CaSO4 by-product in an
environmentally friendly manner is an issue.
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Objective
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• Evaluate the feasibility of using RO by-product in cement
mortar and AACB (alkali activated complex binders) mortars .
Objective
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Material Used
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Material Used
• Cement (Type I/II OPC, ASTM C-150)
• Quickrete all purpose sand (ASTM C 33 )
• Water
• NaOH (10M)
• Sodium Silicate (Na2O:SiO2=1:1)
• CaSO4 salt, RBG (passing #16 sieve )
• Class F fly Ash
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• Fly ash Property (Collected from Boral Material Technology)
Material Used (Cont.)
Component Results
SiO2 50.69 %
Al2O3 23.68 %
Fe2O3 4.68 %
SiO2+ Al2O3+ Fe2O3 79.05 %
CaO 13.19 %
MgO 1.62 %
SO3 1.78 %
Na2O 0.05 %
K2O 0.90 %
Total Alkalies (as Na2O) 0.64 %
Loss of Ignition, % LOI 1.69 %
Specific gravity 2.29 1
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MICRO SCALE TEST
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XRD Analysis of RBG
0 5 10 15 20 25 30 35 40 45 50 55 60 65
Br
Br
Br
H BBB B
BB
B
B
B
Inte
nsity
(A
.U)
2-Theta
B
B: Bassanite
Br: Brucite
H: Hallite
• Bruker D8 X-ray diffractometer
• Bassanite, (CaSO4, 0.5 H2O)
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SEM Analysis of RBG
(a) (b)
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SEM Analysis of RBG (Cont.)
SEM EDX of Rod Shape Particle
-1 0 1 2 3 4 5
0
1000
2000
3000
Mg
K
Na
K
S K
O K
Ca
L Cl K
Ca
K
Ca
K
Cou
nt P
er S
econ
ds
Energy, KeV
Cl K
SEM EDX of Gel layer
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Laser Diffraction Particle Sizing of Fly
Ash
Parameter Outcome
D (0.1) 3.92 µm
D(0.5) 34 µm
D(0.9) 139.80 µm
Surface weighted mean D[3,2] 8.855 µm
Volume weighted mean D [4,3] 85.5 µm
Specific surface area 678 m2/kg
Mean particle size 65 µm
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Sample Preparation
& Curing Condition
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Sample Preparation (Cont.)
ASTM* C-109 (2008)
Cement: Sand: Mixing Liquid= 1:2.75:0.49
AACB mortar (Fly Ash:Sand= 1:2.75, Sodium Silicate: NaOH=0.67,
minimum base water 5% by mass of geopolymer paste )
Samples were prepared in 2 × 2 × 2 in..
*American Society of Testing material
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Curing Process
• Tap Water (For standard samples)
• Cement Mortar cured at room temperature, submerging under
water.
• AACB mortars were kept at 75 ̊ C for total 3 days accelerated
curing.
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Compressive Strength
Test (ASTM C 109-08)
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Compressive Strength Test Result
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Compressive Strength Test Result
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Compressive Strength Test Result
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Conclusion
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Conclusion
• The compressive strength test results indicate that there is
feasibility of disposing RO byproduct CaSO4 in geopolymer
based mortars.
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