Roll No 20.pptx

A Seminar on
WASTEWATER TREATMENT BY OXIDATION
PROCESSES
Presented By
FATHIMATH
LUBNA K
Roll No. 20
Class: S7CE1
2022-23
Staff Advisor
Mr. NOUFAL T
Assistant Professor
Dept. of Civil Engineering
MEA Engineering College,
Perinthalmanna
MEA ENGINEERING COLLEGE
DEPARTMENT OF CIVIL ENGINEERING

OVERVIEW
• What is AOPs and Why
• What is TEDOX Technology?
• Types and their mechanisms
• Factors affecting the Performances of AOPs
• Applications
• Conclusion
• References
FATHIMATH LUBNA K (Roll No:20)
WASTEWATER TREATMENT BY
ADVANCED OXIDATION PROCESSES

1/25
FATHIMATH LUBNA K (Roll No.20)
INTRODUCTION
• Advanced Oxidation Processes (AOPs) are designed to deal
with pesticides, pharmaceutical ,personal care products and
chemicals .
• AOPs differ from the other tertiary processes in that organic
compounds in water are degraded rather than being
concentrated and transferred to a different phase .
• The key to these processes is the generation of a hydroxyl
radical (.OH)
• This is a strong oxidant capable of complete oxidation of
most organic compounds .
• Advanced oxidation processes (AOPs) such as fenton,
ozonation, sonolysis , photocatalysis , UV photolysis, and wet
air oxidation are one amongst the most suitable techniques
for water and wastewater treatment.

2/25
(AOPs)
• Advanced Oxidation processes (AOPs) first proposed in
1980 for the wastewater treatment.
• The process which involves the formation of hydroxyl
radiation (.OH) in sufficient quantity to affect the water
purification are known as Advanced Oxidation Processes
(AOPs).
• AOPs are used to oxidized organic compound that are not
degrade in biological or secondary stage of water treatment.

3/25
FATHIMATH LUBNA k (Roll No.20) WASTEWATER TREATMENT BY
OZONE UV
H2O2
AOPs

4/25
 Degradation of organic pollutants in the presence of hydroxide radicals
Organic pollutants Intermediates CO2, H2O ,etc
(OH) (OH)
• To oxidize organic contaminants to mineralized
product such as CO2 , H2O and inorganic ions .
• .OH is a powerful , non-selective, chemical oxidant
, which acts very rapidly with wide range of organic

5/25
Why AOPs ?
• High efficiency
• Simplicity of Design
• Ability to treat dyes in more concentration
• These processes are effective for the rapid removal of
organic pollutants from water and wastewater ,since may
types of the organic pollutants (such as antibiotics ,
pesticides , chemicals etc..) are resistant to biological
processes.
FATHIMATH LUBNA K
(Roll No.20)

WASTEWATER TREATMENT BY 6/25
Cont...
• AOP creates OH-radicals which in turn oxidize
particular matter in the water. Reaction of OH-radicals
is extremely fast which allows almost immediate and
very effective purification of water.
• AOP when applied on right place , give a good
opportunity to reduce the contaminant concentration
from several hundreds ppm to less than 5 ppb.
• That is why they are called “the treatment processes of
the 21st century”.
FATHIMATH LUBNA K
(Roll No.20)

7/25
PURPOSES OF AOPs
NAME (Roll No.11) PORTLAND LIMESTONE CEMENT
• The AOPs is usually used for removing contaminants
from wastewater coming out of several types of heavy
industries like :
• Petrochemical and plastic industry .
• Chemical industry .
• Food processing industry .
• Textile and dying industry .

8/25
WHAT IS TADOX TECHNOLOGY?
• The Energy and Resources Institute (TERI) , here has
been developed a technology called the Advanced
Oxidation technology or TEDOX.
• Which can reduce less dependence and load on
biological and tertiary treatment systems and help
achieve zero liquid discharge (ZLD) .
• It can reduce chemical oxygen demand , biological
oxygen demand , dissolved organics , pathogens ,
persistent organic pollutants , and micro-pollutants

9/25
Clean
and
Green
Water
Quality
Efficiency
Small
Footprint
• Limited use of chemicals
• Negligible and non-toxic sludge ; no secondary pollution
• Help achieve Zero Liquid Discharge(ZDL) and enhance water
reuse efficiency
• Provide industrial process water quality
• Treatment within few hours ; completely automated and
advanced system
• High resource and energy efficiency
• Decentralized Treatment option in Green buildings ,
townships , commercial , spaces etc

10/25
TYPES OF AOPs :
• OH based
• Ozone based
• UV based
• Fenton related (Fe, H2O2)
Hydroxyl radicals preferably add to C=C bonds or
abstract H from C-H bonds during their reactions with
organic compounds .
• Sulfate Radical (S04-) based
In contrast , sulfate radicals tent to remove electrons from
organic
Molecules that are subsequently transformed to organic
radical cations .

11/25
• OH
H202/
O3/UV
O3/UV
H2O2/
O3
Electrolysis
Sonolysis
UV/TiO2
UV/TiO2/
H2O2

12/25
AOPs- GENERAL MECHANISM
• Involves the in–situ (on site) generation of highly
potent chemical oxidants(*OH) for accelerating the
oxidation .
• OH
• High redox potential(2.80 V )
• Non selective
• Very reactive ,and rapid reaction .
• Hydrogen Peroxide (H2O2)
• Superoxide(O2.) .

13/25
Cont...
FATHIMATH LUBNA K
(Roll No.20)

14/25

15/25
HYDROXYL RADICAL GENERATION

16/25
Reactive Oxygen Species (ROS)
• ROS are chemically reactive molecules that contain
oxygen such as O2- , H2O2 , .OH
• These species are highly reactive due to the presents of
unpaired valence shell electron .
• These free electrons when excited produce single 1O2
which is a powerful oxidant .
• These species are very short-lived species and are
capable of breaking strong chemical bond in the
presence of light.
• These species react with unstable intermediates from
during the course of photo-catalysis and help in
breaking of the bond.

17/25
• The dot after the radical species denotes an unpaired
electron in the outer orbital of the molecule.
• Because of the unpaired electron ,hydroxyl radicals are
reactive electrophiles that react very rapidly with
electron-rich organic compounds .

18/25
e-
O2 2.O2- Superoxide anion
2e- + 2H+
2.O2- 2H2O2 Hydrogen peroxide
e- + H+
H2O2 2.OH Hydroxyl radical

19/25
Catalyzed hydrogen peroxide(H2O2) :

20/25
FACTORS AFFECTING THE
PERFORMANCES OF AOP s
FATHIMATH LUBNA
K(Roll No.20)
• Presents of Carbonate species – Bicarbonate and
carbonate ions present in the background water matrix will
scavenge hydroxyl radicals and reduce the reaction rate
with organics.
• Presents of natural organic matter
• Presents of reduced metal ions – (Fe(II) and Mn(II)
• pH – The pH dictates the level at which certain ions
important to AOPs will be present , including carbonate ion
, bicarbonate ion , and the anion of hydrogen peroxide .

21/25
ADVANTAGES OF AOPs
FATHIMATH LUBNA K
(Roll No.20)
• Unlike conventional technologies , AOPs can provides the
complete mineralization of pollutants .
• They have high reaction rates.
• Reduce toxicity
• In many cases, AOPs consume less energy compared to
thermal destruction processes of liquid wastewaters.
• CO2 reduction

22/25
DISADVANTAGES OF AOPs
FATHIMATH LUBNA K
(Roll No.20)
• High cost due to the use of expensive reagents (H2O2) and
energy consumption (generation of O3 or UV radiation ) .

23/25
CONCLUSION
• AOPs represent a powerful technologies removal of organic pollutants
in industrial wastewater .
• AOPs find its suitable applicability for the treatment of wastewater
containing harmful chemicals .AOPs are based on situ-in generations
of strong oxidant , hydroxyl radicals and sulfate radicals for the
oxidation of organic pollutants .
• Some of the AOPs use ozone and UV irradiation for better treatment
efficiency .AOP Technology have already been established and started
at full scale for the treatment of drinking water and the facilities of
water reuse .
• Several AOPs such as electrochemical treatment ,use of electron beam
,plasma ,microwave , and ultrasound related processes are continually
being studied by the environmental researchers and scientists.
FATHIMATH LUBNA K
(Roll No.20)

24/25
REFERENCE
FATHIMATH LUBNA K
(Roll No.20)
• Marco S. Lucas,(2021). A Bibliometric Study on the Application of
Advanced Oxidation Processes for Produced Water Treatment.
• Ahmed Al Myyahi, Dr. Hamid Ali Abed Al-Asadi(2018). Advanced
Oxidation processes (AOPs) for Wastewater Treatment and Reuse :A
Brief Review.S.
• Bagheri, N. M. Zulkapli, S. B. Abd Hamid(2014), Titanium dioxide
as a catalyst support in heterogeneous catalysis: The Scientific
World Journal.
• N. Merayo, D. Hermosilla, L. Blanco, L. Cortijo, Á. Blanco.
Assessing the application of advanced oxidation processes, and their
combination with biological treatment, to effluents from pulp and
paper industry, Journal of Hazardous Materials 262 (2013)420-427.
• I. Oller, S. Malato, and J. A. Sanchez-Perez, "Combination of
Advanced Oxidation Processes and Biological Treatments for
Wastewater Decontamination - A Review," Science of the Total
Environment, 409 (2011) 4141-4166

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