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Ozone system
integration
Joe Mendez, Director
Courtesy of Piper Environmental Group, Inc
Overview of Class
Provide you with the basic concepts of ozone
system integration.
 You will not be an “expert”, but you will
understand the basic components and their
integration.

Component Descriptions
Feedstock gas
 Ozone Generator
 Injection system
 Contact vessel
 Degas
 Destruct
 Instrumentation and Controls

Cobb Water District - System Diagram
Demister
ClearWater
Tech
CD4040 HO
Ozone
Generator
Ozone
Destruct
Unit
Armstrong AV-3
Gas vent
GDT Corp.
DS – 100 WM
Degasser
System
Pump
30 gpm
Ozone
Contact
Tank
16 gal.
capacity
Mazzei
Injector
with
By pass
Finished Water
ORP
Controller
Fe < 0.1 ppm
Mn ~ 0.05 ppm
Graduated
Media
Filter
110 gal
By pass
Flow rate
140 GPM of Well
Water
Fe = .58ppm
Mn = .12ppm
Feedstock gas

Air.
– Must be clean and very dry. Typical dew point of 800F
– At a dew point of - 200F about 50% of the output
of the ozone generator will be lost
– Will produce Nox which in the presence of
moisture will produce Nitric Acid which corrodes
Stainless Steel
– Source of compressed air must be oil vapor free.
Feedstock gas - continued

Oxygen. - Minimum purity 90% oxygen with a dew
point of - 1000F
– Bottled oxygen - not recommended, except for short, less than one
day, tests.
– Liquid oxygen - not recommended for residential. OK in commercial
and industrial use for short term demonstrations and pilot studies.
– Oxygen generators - Will typically pay for themselves in less than 18
months. Require about 10 to 12 scfm of compressed air per scfm of
oxygen.
• Low pressure systems - less than 10 psig - small ozone
generators - AIRSEP and SEQUAL.
• High pressure systems - up to 100 psig - large ozone generators
- AIRSEP, OGSI, OXAIR, etc.
– Be aware of fire problems specially in large units
Ozone generators
UV - not suitable for water treatment. Output
is about .1% ozone by weight. Used in Spas.
 Corona discharge - suitable for water
treatment. Output range of 1 to 18% ozone by
weight.
 Output, Concentration and Flow. What is their
relationship?

– (G/hr) X (0.0755) / ( % conc.) = Nm3/hr
Ozone generators - continued

Variants of CD ozone generators.
– Frequency - Low frequency (60 Hz), Medium
frequency (1000 Hz) and High frequency
(10,000Hz)
– Cooling - Air or water cooled
– Operating pressure - Vacuum, 10 to 15 psig
and20 to 30 psig
– Size - Small (<10 PPD), medium (>10 to 150
PPD) and large (>150 PPD to one ton per day)
– Feedstock gas - Air or oxygen
Ozone injection

Bubbling or direct injection
– Low mass transfer efficiency
– Takes a lot of real estate
– Subject to water back-flowing into generator

Eduction - Venturi effect (Mazzei injectors)
– High mass transfer efficiency
– Compact foot print
– Subject to water back-flowing into generator
Contact vessel
A tank or length of pipe designed to allow the
ozone gas and the water to mix for about 30
seconds to 1 minute. It improves mass
transfer of the ozone.
 Residential - Fiberglass tank in the 20 to 40
gallons range.
 Commercial/Industrial - 304 stainless steel
tank in various size ranges.

Degas system

Residential - Typically a stainless steel vent valve on top
of the contact vessel. Allows the un-dissolved gasses,
including excess ozone to be vented from the top of the tank.

Commercial / Industrial - Typically an additional
stainless steel vessel that imparts centrifugal force on the
water and separates it from the un-dissolved gasses. They in
turn are vented through a stainless steel vent valve.

GDT System is a patented separator device. Due to cost,
it is not used in a residential or light commercial
environment.
Destruct system
The purpose of a destruct system is to destroy any
excess ozone in the off gas. Ozone is a Toxic Gas
and an EPA listed pollutant. It should not be vented
into the atmosphere.
 Variants of ozone destruct units

– Temperature only - Expensive to operate. Requires a minimum of
5000F for quick (<1 sec.) destruction.
– Catalyst only - Inexpensive to operate. Requires that gas flow be
de-misted to remove excess moisture. Moisture will destroy the
catalyst and Sulfur will poison it.
– Combination units - Most widely used. Uses a small heater to dry
the gas stream and catalyst to complete the destruction.
Instrumentation and controls
Instrumentation -The purpose of
instrumentation is to allow the user or
operator to be aware of the operating
conditions. Instrumentation can be hand held
or fixed. It can also be chemical or electronic.
 Controls - The purpose of controls is to allow
for the automatic control of the ozone
generator and associated equipment.

Instrumentation and controls continued

Dissolved ozone - Colorometric - DPD Chlorine or Indigo Blue.
About $75 in cost. Readings up to 2.3 ppm. Used to indicate spot
readings.

Dissolved ozone - Electronic - wet cell without reagents. About
$3,000 in cost. Readings up to 15 ppm. Typically used to indicate and to
control ozone generator output. Most typically used in industrial and high
end commercial applications.

ORP - Oxidation Reduction Potential. Less than $1,000 in
cost. It is used as both an instrument and a control. It can control ozone
generator output. Readings are expressed in mV (millivolts). European
standards declare that water is sanitized after it reaches a reading of 750
mV of ORP. Most typically used in commercial and high end residential
applications.
Methods of integration
Factory systems. The system is integrated for you and it is
delivered as a complete package. Lends itself to small
systems under 20 gpm. Typically used in the residential and
light end commercial environment.
 Self integrated systems. This requires a much higher level
of expertise. It requires knowledge of pumps, injection
systems, contacting, degassing and controls. It requires the
ability to assemble the entire system from various pieces and
vendors. The amount of capital required for this level also
increases dramatically, with the size of the ozone generator.
An integrator is usually a “Distributor”, and they take
ownership of the equipment, so the integrator must have the
ability to finance the equipment until paid by the end user.

Questions?