Ozone treatment – OHR MIXER (static mixer)

Mixer subnav

One special pipe applying aerodynamics goes beyond conventional reaction and mixing levels.OHR MIXER

Conventional ozone treatment requires “large and complicated equipment” “high cost” “low efficiency”.

Photo of ozone gas bubbling

Conventional ozone treatment requires large and complicated equipment
that is expensive and inefficient because of a large amount of low
concentration ozone gas being blown into wastewater in large concrete
tanks. Ozone gas and target substances react slowly over time.

Porous ceramics diffuser tubes / plates are used for ozone reaction,
but the ozone gas of several millimeters to several centimeters size rises
up too quickly, and a large amount of unreacted ozone gas is released
from the water. Unreacted ozone gas (= waste ozone gas) is harmful so
"waste ozone decomposing equipment" is absolutely necessary.

This conventional method is an inefficient method of generating large
amounts of ozone gas and decomposing large amounts of unreacted ozone gas.

OHR ozone treatment is a highly efficient and low cost method.

Both ozone gas and liquids are broken down into microparticles that then powerfully collide and react with each other.

Micro-nano bubbles

Photo of Micro-nano bubbles

Micro-nano size ozone bubbles generated by OHR MIXER stay in
water for a long time, and contact / react with the target substance
in the wastewater. The OHR bubbles contact area is so much larger
than conventional coarse bubbles that they can not be compared.

Bubbles generated by OHR MIXER that look like pure white clouds in
the right photo are ozone microbubbles. Micron size ozone bubbles
of 0.5 to 30 microns stay for a long time because of low buoyancy.

Furthermore, ozone nano bubbles that are transparent are generated
in large quantities by OHR MIXER. (*A water treatment engineering
company evaluated the OHR gas-liquid reaction method and found that
70% of the injected gas was dissolved (=nano bubbles) and the remaining
30% turned into mostly microbubbles and into a few coarse bubbles.)

Direct reaction method


At the moment of passing through the OHR MIXER, both ozone and
wastewater are broken down into microparticles and powerfully collide
and react with each other by centrifugal force and centripetal force.
In other words, ozone gas and the target substances in wastewater
directly contact and react with each other in the OHR MIXER pipe.
This means that OHR method is the “direct reaction method”.

The conventional method is an “indirect reaction method”.
Firstly coarse ozone bubbles are supposed to be dissolved into the
water and then by chance the dissolved ozone gas contacts and reacts
with the target substances.

Real case examples

Small and simple equipment

Before and after OHR
ozone treatment

OHR ozone treatment method does not require waste ozone
decomposing equipment. In addition, small amounts of high
concentration ozone gas is used, so the use of the ozonizer is
much smaller than the conventional ozone treatment method.

Paper mill T uses “OHR ozone micro-nano bubble treatment method”
for discoloration of 5,000m3/day of colored wastewater and the
treatment equipment has been operating consistently for over 10 years.
The equipment uses 1) no ozone gas bubbling tank, 2) no waste ozone
decomposing equipment, 3) smaller ozonizer than the conventional
ozone treatment method. Therefore the introduction costs of the
equipment were $2 million, one-third of the conventional method
($6 million). OHR is a highly effective ozone treatment method at a fraction of the cost of conventional methods.

In addition, regular cleaning and replacement of clogged diffuser pipes / plates including draining water from the
ozone reaction tank is necessary for conventional methods.
OHR ozone treatment does not require an ozone bubbling tank and OHR MIXER is maintenance free.
Only the pump needs regular maintenance.

Real case examples

Waste ozone decomposing equipment is unnecessary with OHR method.

The waste ozone decomposing equipment is intended to promote the self-decomposition of harmful ozone gas through
the tank filled with activated carbon or catalyst to make it harmless. A large amount of waste ozone gas comes out in the
conventional ozone treatment facility, so this equipment must be installed. As the scale of ozone treatment increases,
the waste ozone treatment facility will also become large. Also as the filled activated carbon or catalyst gradually
decreases or deteriorates, periodic replenishment / replacement becomes necessary.
With OHR ozone treatment, it is also possible not to use waste ozone decomposing equipment.
For details, please contact us.


Dioxins can be decomposed with ozone alone.

In the conventional method, it is said that dioxins can not be decomposed unless the *AOP is used.

Result of analysis.
It is said that dioxins can not be decomposed by ozone alone, so treatment
using *AOP (Advanced Oxidation Process) is required.
But as a result of the test conducted by Y company in Japan it became clear
that OHR can decompose dioxins without AOP using ozone only.
(The test carried out was thorough. The analysis costs alone were $100,000.)

*The AOP (Advanced Oxidation Process) is a treatment method of combining ozone
with hydrogen peroxide or ultraviolet rays to generate "hydroxyl radical", which is
an active oxygen and has the strongest oxidation power.

This test confirmed that when water containing dioxins and ozone gas pass
through the OHR MIXER 3 times, dioxins decompose. Please contact us for details.


New effluent international standard! What is WET. (Whole Effluent Toxicity)

WET is a method to directly evaluate the efects on the environment of aquatic organisms such as killifish, alga and water fleas.

WET (Whole Effluent Toxicity) is not a chemical analysis method such as BOD or COD
but a method to directly evaluate the effects on the environment of aquatic organisms
such as killifish, alga and water fleas.

BOD and COD are indirect ways of measuring the impurity levels of wastewater by
oxidative decomposition using microorganisms or oxidizing chemical agents, but only
a part of the substances identified by oxidative decomposition can be measured.
For example, it is known that potassium permanganate, an oxidizing agent used in the
analysis of COD in Japan, can detect only 40% to 70% of all organic matter contained in

It is known that undecomposed persistent trace substances that are not identified
are released from wastewater emission sources (such as factories, sewage plant etc.)
into the environment and have a significant negative impact on life and the natural
environment. Therefore, new standards to evaluate the effects of treated water on life and the natural environment not indirectly
by oxidizing and chemical indications such as BOD or COD but directly by “actually keeping aquatic organisms in treated water”.
(Treated water evaluation by bioassay.)

This new effluent regulation has already been introduced in the U.S., Canada, UK, France, Denmark, South Korea, and other
countries, although the name and methods differ. Similar regulations will be introduced in Japan shortly.

The following may contravene the WET regulations.

Even treated water shown in the box on the right side
may contravene the WET regulations if the water has
an adverse effect on aquatic organisms.

“Ozone treatment” used for treated water can decompose approx 90% of undecomposed substances in the treated water
and is an accepted effective treatment method that is WET compliant.

[Column] Various pharmaceutical substances ingested by humans were detected in river water.

Kyoto University in Japan analyzed chemicals in the water from the Yodo River from 6 months (from October 2009 to March 2010) (for
61 kinds of analyzable chemicals). According to the results, a wide variety of pharmaceutical substances ingested by humans as well as
agricultural chemicals and herbicides were detected. (Antipyretic sedative, lipid-lowering medicine, hypotensive medicine,
antiepileptic drug, etc.) It is assumed that medicines ingested by humans were excreted and the substances were not decomposed at a
sewage treatment plant and the water drained into the Yodo River as treated water.

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