1
Miss Souhaila Trabelsi Souissi
Plasma chemical oxidation of phthalic anhydride: Application to the treatment of
Tunisian landfill leachate
LC EACL
C
Directed by: Nihal Oturan (UPEMLV) Nizar Bellakhal (INSAT)
Mehmet.A Oturan (UPEMLV)
2
Advanced Oxydation Process
Phtalates
Plan
Introduction1
2
3
Gliding arc plasma 4
Experimental study 5
6Conclusion
3
PhtalatesIntroduction AOP Experimentalstudy
Gliding arc plasma
Conclusion
The increase of industrial and
agricultural activities in developing
countries
The use of high varieties of
synthetic chemicals
80% of the diseases are directly associated with polluted water.
Synthtic chemicals are considered toxic when they are present in aquatic
environment
4
1,2-dicarboxylic benzene acids + Alcohol ↔ Phtalates + water
They are essentially used as plasticizers to increase the flexibility and
durability of polyvinyl chloride
Several industrial plants produce large amounts of wastewater containing
high concentration of phthalates (COT = 6400,88 mg L-1) .
PhtalatesIntroduction AOP Experimentalstudy
Gliding arc plasma
Conclusion
The need to develop an effective, ecological and economical treatment
processes becomes obvious
5
Removal of Phthalates Biological Process
Insuffisent Advanced Oxidation Process (AOP)
In situ generation of hydroxyl radical : . OH (E°OH./H2O=2,8 V/ENH)
PhtalatesIntroduction AOP Experimentalstudy
Gliding arc plasma
Conclusion
6
Advanced Oxidtion Process
Chemical
Photochemical
Electrochimical
.OH + Pollutants CO2 + H2O + mineral ionsMinéralization
PhtalatesIntroduction AOP Experimentalstudy
Gliding arc plasma
Conclusion
7
PhtalatesIntroduction AOP Experimentalstudy
Gliding arc plasma
Conclusion
Gliding arc discharge « Glidarc »
(ions, photons, electrons, molecules, radicals)
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PhtalatesIntroduction AOP Experimentalstudy
Gliding arc plasma
Conclusion
Chemical properties of Glidarc
9
The Gliding arc plasma depends on several factors
O
O
O
Phthalic anhydride
The catalyst initial concentration
The nature of catalyst
PhtalatesIntroduction AOP Experimentalstudy
Gliding arc plasma
Conclusion
10
Effect of the Fe2+ initial concentration
[Fe3+]0 : 0 mM (♦); 0,1 mM (◊); 0,2 mM (▲), 0.5 mM (□), 1 mM (■)
[phthalic anhydride]0 = 0,05 mM, V = 200 mL, Ф = 650 L h-1, d = 2,5 cm.
PhtalatesIntroduction AOP Experimentalstudy
Gliding arc plasma
Conclusion
0,00
0,02
0,04
0,06
0 50 100 150
Time (h)
C (
mM
)
Fe2+ + .OH → Fe3+ + OH-
11
PhtalatesIntroduction AOP Experimentalstudy
Gliding arc plasma
Conclusion
Effect of the Fe3+ initial concentration
0,00
0,02
0,04
0,06
0 50 100 150
Time (min)
C (
mM
)
[Fe3+]0 : 0 mM (♦); 0,1 mM (◊); 0,2 mM (▲), 0.5 mM (□), 1 mM (■)
[phthalic anhydride]0 = 0,05 mM, V = 200 mL, Ф = 650 L h-1, d = 2,5 cm.
Fe3+ + H2O2 ↔ Fe–OOH2+ + H+
Fe–OOH2+ → HO2. + Fe2+
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Plasmachemical treatment with TiO2
PhtalatesIntroduction AOP Experimentalstudy
Gliding arc plasma
Conclusion
0,00
0,01
0,02
0,03
0,04
0,05
0,06
0 50 100 150
Time (min)
C (
mM
)
[TiO2]0 en g.L-1: 0 (♦); 1 (◊); 2 (□); 3 (■); 4 (▲)
[phthalic anhydride]0 = 0,05 mM, V = 200 mL,Ф = 650 L h-1, d = 2,5 cm.
13
PhtalatesIntroduction AOP Experimentalstudy
Gliding arc plasma
Conclusion
[Fe2+] = 0,5 mM (x); [Fe3+] = 0,5 Mm (Δ); [TiO2] = 2 g.L-1 (●)
[phthalic anhydride]0 = 0,05 mM, V = 200 mL,Ф = 650 L h-1, d = 2,5 cm.
0,0000
0,0200
0,0400
0 40 80 120 160
Time (min)
C (
mM
)
Study of the efficiency of catalysts
14
PhtalatesIntroduction AOP Experimentalstudy
Gliding arc plasma
Conclusion
parameters value
COD0 (mg/L) 10200
pH 8.15
Conductivity (mS.cm-2) 39.7 à 22.8°C
[Fe] (mmol/L) 0.135
Characteristics of Tunisian landfill leachate
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Plasmacatalysis depollution of landfill leachate with TiO2
PhtalatesIntroduction AOP Experimentalstudy
Gliding arc plasma
Conclusion
30
60
90
0 4 8
Time (h)
DC
O (m
g.L
-1)
[TiO2] en g L-1: 0 (●); 10 (Δ); 15 (■); 25 (□) and 35 (♦).
[phthalic anhydride]0 = 0,05 mM, V = 200 mL, Ф = 650 L.h-1, d = 2,5 cm.
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Plasmacatalysis depollution of landfill leachate under optimum conditions
PhtalatesIntroduction AOP Experimentalstudy
Gliding arc plasma
Conclusion
30
60
90
0 4 8
Time (h)
DC
O (
mg
. L-1
)
[phthalic anhydride]0 = 0,05 mM, [TiO2]0 = 15 g.L-1, V = 200 mL,
Ф = 650 L.h-1, d = 2,5 cm.
Oxidation rate: 51 %
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Gliding arc discharge Oxidation rate = 75 %
Effeciency of this method in removing phthalates from Tunisian landfill leachate:
Oxidation rate = 51%.
The disadvantage of this technique is the electrical energy consumed .
PhtalatesIntroduction AOP Experimentalstudy
Gliding arc plasma
Conclusion
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