Eutectic Freeze Cry rystallization for Treatment of f Text xtile - - PowerPoint PPT Presentation

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Eutectic Freeze Cry rystallization for Treatment of f Text xtile - - PowerPoint PPT Presentation

Feb 26, 2024 240 likes •477 views

Crystallization Unit& Precipitation Research Eutectic Freeze Cry rystallization for Treatment of f Text xtile Waste Concentrates Buhle Manana Supervisor: Dr. Marcos Rodriguez-Pascual So Sodium chloride So Sodium sulp lphate Dyes

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SLIDE 1

Eutectic Freeze Cry rystallization for Treatment of f Text xtile Waste Concentrates

Buhle Manana Supervisor: Dr. Marcos Rodriguez-Pascual

Crystallization Unit& Precipitation Research

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SLIDE 2
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SLIDE 3

Dyes So Sodium sulp lphate So Sodium chloride

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SLIDE 4

Conventional Wastewater Treatment

Reverse Osmosis (RO) Evaporative Crystallization Water RO Retentate Water Mixed salt

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SLIDE 5

Eutectic Freeze Crystallization (EFC)

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SLIDE 6

Eutectic Freeze Crystallization (EFC) Ic Ice Floats Sa Salts Si Sink

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SLIDE 7

EFC vs. Evaporative Crystallization

Researchers System Energy Savings (EFC vs. EC) % Himawan Magnesium sulphate- water 60 Nathoo et al. Sodium-sulphate water 85 Vaessen Potassium nitrate-nitric acid 69

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SLIDE 8

Ternary Diagrams

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SLIDE 9
  • To investigate the recovery and purity of water and sodium

sulphate using EFC

  • Which operating temperatures should be used?
  • What is the recovery and purity of the products at those

temperatures?

Objectives

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SLIDE 10

Thermodynamic modelling

Component Concentration (mg/l) Ca2+ 40 Mg2+ 14 Chloride, Cl- 28000 Sulphate, SO4

2-

10000 Total Silica ,SiO2 110 Sodium as Na+ 23000 Iron as Fe3+ 0.8 HCO3- 1640 Component Concentration (g/l) Sodium sulphate 14.77 Sodium chloride 46.16

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SLIDE 11

Thermodynamic modelling

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SLIDE 12

Thermodynamic Modelling

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SLIDE 13

Experimental Procedure

Na2SO4 . 10H2O and ice seeds Ice Na2SO4 . 10H2O

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SLIDE 14

Results

50 100 150 200 250 300 350 400 450 500

  • 7
  • 6.5
  • 6
  • 5.5
  • 5
  • 4.5
  • 4
  • 3.5
  • 3
  • 2.5
  • 2

Ice recovery (g) Temperature (oC) OLI results Experimental

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SLIDE 15

Results

5 10 15 20 25 30

  • 7
  • 6.5
  • 6
  • 5.5
  • 5
  • 4.5
  • 4
  • 3.5
  • 3
  • 2.5
  • 2

Salt Recovery (g) Temperature (oC) OLI results Experimental

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SLIDE 16

Discussion

v

Ice crystal Salt crystal Settling of salt crystals

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SLIDE 17

Results

500 1000 1500 2000 2500 3000 EFC Evaporative crystallization Energy (kJ/Kg)

ENERGY REQUIREMENTS FOR WATER PURIFICATION

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SLIDE 18

Conclusion

  • EFC can recover salts and water from ternary

system with high purity

  • Lower energy costs
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SLIDE 19
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SLIDE 20

Recovery of Anhydrous salt

Anhydrous salt recovery (%) Experimental maximum from OLI 17.3 29.4 41.2 64.1 51.3 80.0

Crystallization & Precipitation Unit

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SLIDE 21

Energy Requirements

exp number sensible ice formation salt formation losses 1 14389 41989 4060 27000 2 17007 97892 9771 37800 3 14577 136340 12160 37800 average 15324 92074 8664 34200

Crystallization & Precipitation Unit

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SLIDE 22

Experimental data

20 40 60 80 100 120 140 160 OLI exp1 exp2 exp3 water recovery (g)

water recovery at -3.6 oC

Series1 Crystallization & Precipitation Unit 2 4 6 8 10 12 OLI exp1 exp2 exp3 sodium sulphate decahydrate recovery (g)

Salt Recovery at -3.6 oC