Ozone Water Treatment

1. MEWAR UNIVERSITY
OZONE WATER TREATMENT
NAME: RAYEES AHMAD BHAT
COURSE: B.TECH MECHANICAL 3RD YEAR
ENROLLMENT NUMBER: MUR1400118

2. TOPIC
OZONE WATER TREATEMENT

3. INTRODUCTION TO OZONE
The ozone layer is a vital component in the history
of life on the earth.
Without ozone mankind and most forms of
life that we know today probably would not
exist and the environment of the planet would
be extremely different.

4. Introduction continue
Ozone has been instrumental in protecting earth and
its life forms for so long. It is not just a beneficial
molecule, but is absolutely essential to this planet we
call home. But there is much apprehension and
misunderstanding regarding ozone use in water
treatment. There is a logarithmic increase in human
population and zero increase in fresh water supply on
this planet.

5. HISTORY OF OZONE
Ozone was first thought to have been
identified in 1839 by Christian schonbein, a
Swiss chemist.
He named it ozone from the Greek term “ too
smell” because of its strong odour. But this
scientist was not able to describe its molecular
structure. And this was achieved by JEAN-LUIS
SORET in the 1860.

6. Definition of ozone
Ozone is a natural but unstable molecule. The pure gas
a pure sky blue colour with a pungent acrid smell. The
unstable gas ozone (O3) is a molecule composed of
three oxygen atoms, temporarily existing in a very
unstable and reactive state. Ozone is so reactive
that a suitable container for storage probably does
not exist. Ozone is found in upper part of
atmosphere that is in stratosphere and is formed
due to UV radiation that falls on oxygen.

7. Properties of ozone.
 Ozone is a bluish colour gas that has a boiling point of 1120
C.
 At atmospheric pressure ozone can partially dissolve in
water.
 At standard pressure and temperature the solubility of
ozone is thirteen times that of oxygen.
 Ozone is one of the strongest oxidiser available for water
treatment.

8. What is ozone water treatment?
 Ozone water treatment is the process of using ozone
to purify water that is removing microorganisms that
can make you sick from drinking water.
 This process has been used in drinking water plants
since 1903 where the first industrial ozonation plant
was built.

9. HISTORY OF OZONE WATER
TREATMENT
Ozone was first used in water treatment in 1800 century and ozone is more widely
used in Europe and Asia than the United states.
(1) In 1886 ozone recognised as a disinfectant for water.
(2) In 1891 ozone was found effective against bacteria.
(3) In 1893 first ozone drinking water treatment facility in Netherlands.
(4) In 1903 first plant built in the U.S.A.
(5) In 1936 France alone had about 100 ozone water treatment facilities.

10. How do we produce ozone?
 Electric discharge:- it is also known as[ corona
discharge ].
High voltage electricity+ Dry air or pure oxygen
(O2) O3
 Electrolytic ally:- This is the very simplest method
to produce ozone ,This process is more expensive then
electrical discharge and is same as above but here we
use acid instead of oxygen.
Spark plug

11.  Photo chemically:-
O2+O O3
 In this process the ultra violet radiation used for making ozone is
obtained from red bulb.
UV
From Bulb

12. How does ozone work?
Ozone will initiate a series of reactions in water that are
very complex and quite specific to the water being
treated.
Ozone reacts in water or any aqueous solution in two ways:-
DIRECTLY :-In directly ozone reacts with water via three mechanisms:-
(1) Cycloaddition (+&-); on unsaturated bonds as a
dipole.
(2) Electrophillic (+); on molecular sites with strong
electronic density
(3) nucleophilic(-); on molecular sites with an
electronic deficit.

13. INDIRECTLY:-via radicals formed as it decomposes in
water ; A few such radicals are as follows;
(1)Hydroxyl radical ,OH, a main reactive ingredient.
(2)Hydro peroxide radical, HO2.
(3)Superoxide radical ion, O2.
(4)Ozonide radical ion,O3.

14. Advantages of ozone water
treatment
 Ozone is very effective and rapidly reacts with bacteria
viruses and has stronger germicidal properties than
chlorination.
 It has a very strong oxidising power with a short
reaction time.
 The treatment process does not add any chemicals to
water.
 Ozone can eliminate a wide variety of inorganic,
organic and microbiological problems and taste and
odour problems.

15. Disadvantages of ozone water
treatment
 Ozone water treatment is much expensive than other
treatment levels.
 In ozone water treatment there must be professional
proficient for water treatment and system maintenance.
 It does not provide any germicidal or disinfection residual
to prevent re growth.
 Due to its less solubility in water special mixing
techniques are needed.
 Fire hazards and toxicity issues associated with ozone
generation.