DAYEH UNIVERSITY DEPARTMENT OF ENVIRONMENTAL ENGINEERING

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DAYEH UNIVERSITYDEPARTMENT OF ENVIRONMENTAL
ENGINEERING

• Advanced oxidation processes (AOPs)
• Presented by Nguyen Thi Hang
• Master student of Environmental Engineering

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Defination

• Advanced oxidation processes (AOPs) are use for
  destruction of synthetic organic chemicals (SOCs)
  in water, apart from disinfection and
  deactivation of pathogenic microorganism that are
  difficult to degrade biologically
• These processes include the application of
  ozone, hydrogen, and ultraviolet light, either
  individually or in combination O3/UV H2O2/UV
  and O3/H2O2/UV.
• These processes are mediated by free-radical
  reactions, and are combining increasingly complex
  from the standpoint of scientific analysis.
• Oxidation processes based on generation of
  hydroxyl radical (OH.) intermediates.
  Combinations based on H2O2, O3, UV have been
  investigated most heavily.
• Its the water treatment process of the 21st
  century.

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The role of OH. in AOPsorganics OH.
CO2 H2OCxHyClz OH.
CO2 H2O Cl-
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The generation of hydroxyl radical
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Ultraviolet (UV)

• Ultraviolet is a general term for electromagnetic
  radiation emitted from the spectrum lying beyond
  the visible light (400 nm) and before x-rays
  (100nm).
• UV is widely accepted as a reliable,
  environmental friendly solution for water
  treatment.

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The UV spectral range of interest for the UV
photolysis applications in water
UV/H2O2 process (2/3)
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Target compounds

• AOPs are suitable for destroying dissolved
  organic contaminants as halogenated hydrocarbons
  (trichloroethane, trichloroethylene), aromatic
  compounds (benzene, toluene, ethylbenzene,
  xylene-BTXE), pentachlorophenol (PCP),
  nitrophenols, detergents, pesticides, etc.
• AOPs can also be used to oxidize inorganic
  contaminants such as cyanide, sulphide, and
  nitrite.

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Categories of AOPs

• Several methods are available for generating OH
  radicals. These include both non-photochemical
  and photochemical methods
• Ozonation at elevated pH (gt8.5)
• Ozone hydrogen peroxide (O3/H2O2)
• Ozone catalyst (O3/CAT)
• Fenton system (H2O2/Fe2)
• O3/UV
• H2O2/UV
• O3/H2O2/UV
• Photo-Fenton/Fenton-like systems
• Photocatalytic oxidation (UV/TiO2)

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Advanced oxidation processes (1/2)
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Advanced oxidation processes(2/2)
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UV/H2O2 process (1/3)-advantages

• Removal of micro-and macro-pollutants from
  drinking water
• Removal of the disinfection by-products and their
  precursors from drinking ware.
• Treatment of toxic organics at low concentrations
  in groundwater
• Treatment of low-volume- high-strength
  wastewaters for detoxification and enhanced
  degradability
• Treatment of contaminated soil washing water
• Control of off-gas emissions from volatile
  organic compound (VOC) stripping.

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UV/H2O2 process (2/3)-mechanism

• UV H2O2 2HO.
• HO. H2O2 HO2. H2O
• HO2. H O2-.
• HO2. O2-. H2O H2O2 O2 OH-
• OH2. HO2. H2O2 O2

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Application of H2O2-based AOPs

• Pretreated WW H2O2-based AOPs Effluent
• Pretreated WW Bio H2O2-based
  AOPs Effluent
• Pretreated WW H2O2-based AOPs Bio Effluent

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Strong point of H2O2

• Powerful oxidizer
• Safe
• Versatile
• Selective
• Widely use

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Fenton process
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Application of AOPs

• AOPs for volatile organic compounds (VOCs) and
  odor treatment.
• Advanced oxidation of textile industry dyes

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Application of AOPs

• 3. Water treatment application

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Conclusion

• With many applications of AOPs, its called the
  water treatment process of the 21st centery.
• AOPs requires a simple technology (UV lamp and
  necessary chemicals) so its cheaper than others.
• its friendly with environment.

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Reference

• I search all these information form website
• http//books.google.com/books?id7NeNgJWaavgCpgP
  A1lpgPA2otsZA77JJxVASdq22numberofaoppubl
  ications22siggfHz_03Cq5PwGPXvbEWYLn38LI0PPA331
  ,M1

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• Thank for your attention