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

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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 

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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-

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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.

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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

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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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PhtalatesIntroduction AOP Experimentalstudy

Gliding arc plasma

Conclusion

Thanks for your attention