Sustainable Utilization of RO By-
Product Solids
By
Bijoy Krishna Halder, Vivek Tandon, Anthony Tarquin,
Guillermo Delgado...
Agenda
 Introduction
 Challenges
 Objective
 Material Used
 Micro Scale Test
 Sample Preparation and Curing Conditio...
Introduction
Introduction
• Water is an important resource.
• To produce potable water, various techniques e.g. desalination
is used.
•...
Challenges
Challenges
 The disposal of this waste CaSO4 by-product in an
environmentally friendly manner is an issue.
Objective
• Evaluate the feasibility of using RO by-product in cement
mortar and AACB (alkali activated complex binders) mortars .
O...
Material Used
Material Used
• Cement (Type I/II OPC, ASTM C-150)
• Quickrete all purpose sand (ASTM C 33 )
• Water
• NaOH (10M)
• Sodium...
• Fly ash Property (Collected from Boral Material Technology)
Material Used (Cont.)
Component Results
SiO2 50.69 %
Al2O3 2...
MICRO SCALE TEST
XRD Analysis of RBG
0 5 10 15 20 25 30 35 40 45 50 55 60 65
Br
Br
Br
H B
BB B
B
B
B
B
B
Intensity(A.U)
2-Theta
B
B: Bassan...
SEM Analysis of RBG
(a) (b)
SEM Analysis of RBG (Cont.)
SEM EDX of Rod Shape Particle
-1 0 1 2 3 4 5
0
1000
2000
3000
MgK
NaK
SK
OK
CaL
ClK
CaK...
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 weigh...
Sample Preparation
& Curing Condition
Sample Preparation (Cont.)
 ASTM* C-109 (2008)
 Cement: Sand: Mixing Liquid= 1:2.75:0.49
 AACB mortar (Fly Ash:Sand= 1:...
Curing Process
• Tap Water (For standard samples)
• Cement Mortar cured at room temperature, submerging under
water.
• AAC...
Compressive Strength
Test (ASTM C 109-08)
Compressive Strength Test Result
Compressive Strength Test Result
Compressive Strength Test Result
Conclusion
Conclusion
• The compressive strength test results indicate that there is
feasibility of disposing RO byproduct CaSO4 in g...
ASCE TEXAS 2013 centennial
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ASCE TEXAS 2013 centennial

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ASCE TEXAS 2013 centennial

  1. 1. Sustainable Utilization of RO By- Product Solids By Bijoy Krishna Halder, Vivek Tandon, Anthony Tarquin, Guillermo Delgado The University of Texas at El Paso
  2. 2. Agenda  Introduction  Challenges  Objective  Material Used  Micro Scale Test  Sample Preparation and Curing Condition  Compressive Strength Test  Conclusion
  3. 3. Introduction
  4. 4. 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.
  5. 5. Challenges
  6. 6. Challenges  The disposal of this waste CaSO4 by-product in an environmentally friendly manner is an issue.
  7. 7. Objective
  8. 8. • Evaluate the feasibility of using RO by-product in cement mortar and AACB (alkali activated complex binders) mortars . Objective
  9. 9. Material Used
  10. 10. 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
  11. 11. • 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
  12. 12. MICRO SCALE TEST
  13. 13. XRD Analysis of RBG 0 5 10 15 20 25 30 35 40 45 50 55 60 65 Br Br Br H B BB B B B B B B Intensity(A.U) 2-Theta B B: Bassanite Br: Brucite H: Hallite • Bruker D8 X-ray diffractometer • Bassanite, (CaSO4, 0.5 H2O)
  14. 14. SEM Analysis of RBG (a) (b)
  15. 15. SEM Analysis of RBG (Cont.) SEM EDX of Rod Shape Particle -1 0 1 2 3 4 5 0 1000 2000 3000 MgK NaK SK OK CaL ClK CaK CaK CountPerSeconds Energy, KeV ClK SEM EDX of Gel layer
  16. 16. 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
  17. 17. Sample Preparation & Curing Condition
  18. 18. 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
  19. 19. 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.
  20. 20. Compressive Strength Test (ASTM C 109-08)
  21. 21. Compressive Strength Test Result
  22. 22. Compressive Strength Test Result
  23. 23. Compressive Strength Test Result
  24. 24. Conclusion
  25. 25. Conclusion • The compressive strength test results indicate that there is feasibility of disposing RO byproduct CaSO4 in geopolymer based mortars.

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