DAF / Micro-nano bubbles / Emulsification / Uniform dispersion / Ozone treatment / Neutralization & pH control / Others

Air diffuser for wastewater treatment / Prevention of sludge accumulation / VOC removal, Degassing / Gas-Liquid reaction

OHR mixer 01 DAF (flotation separation)  It is a type of separation technology that brings up suspended matters such as oils or solids to the surface and then separates them from the water using the buoyant force of microbubbles.
Disadvantages and limitations
of conventional technologies :
OHR Technology :
Inside the pressure tank it is difficult to keep the optimal pressure,
so operator has to make daily pressure adjustments.
Regular pressure tank replacement is also necessary.
No pressure tank is used at all. Operation adjustment is needed
only once during the first time. No additional adjustments
necessary and optimal conditions are always maintained.
High pressure water pump and high pressure air are necessary. The pressure of injection air is very low at 0.1MPa.
The pump uses the same electric power as a normal water pump.
They only generate low quality microbubbles which
have low ability to separate SS, so it is necessary
to add a large amount of flocculants.
High quality microbubbles can be generated so flocculants are
normally reduced by 20 to 30% (*up to 50% in some cases)
compared with the conventional DAF systems.
Many conventional units are necessary for large scale wastewater
treatment plants causing complications and extra expense.
One OHR MIXER and one pump generate up to 15,000L/min of
microbubbled water.
Minimum pump power and the simplest piping configuration.
Real cases ■ A large amount of microbubbled water of 1,800L/min is generated by OHR MIXER MX-F80 model + 22 kW pump. Show movies
■ SS and n-Hex in oil-containing wastewater are floated and separated without flocculants using OHR DAF system.
■ Markedly improved separation performance by installing one OHR MIXER in existing DAF systems. See details
02It is a technology that generates micron and nano size bubbles used for flotation separation, washing, cooling water, gas dissolution, etc.
Disadvantages and limitations
of conventional technologies :
OHR Technology :
Most technologies can only generate very small amounts
of microbubbled water for laboratory tests or small plants.
From small amounts (10L/min) to very large amounts (15,000L/min)
of microbubbled water can be generated with one OHR MIXER.
It can be used in many situations from laboratory-scale to large-scale.
Conventional technologies can generate micro-nano
bubbles from only a few kinds of gas.
Also microbubbles can not be made in pure water.
All type of gas / liquid can be broken down
into micro-nano size particles.
The equipment is complicated and uses a pressure tank
or a high pressure pump. Some technologies can only
generate microbubbles in a water filled container.
With only the OHR MIXER and pump, micro-nano bubbles
can be generated consistently.
Most equipment can only generate one kind of bubble
such as microbubbles or nanobubbles.
Three kinds of bubbles microbubbles / nano-bubbles /
coarse-bubbles can be made by a simple valve operation.
Relies on pressure difference only to generate micro-nano bubbles,
there is no function to actively mix and react the gas and liquid.
Inside the OHR MIXER, micro-nano bubble generation and
gas-liquid mixing / reaction takes place simultaneously. Therefore,
the OHR MIXER can replace conventional reaction equipment.
Real cases ■ Chemical company H uses OHR MIXER to deoxygenate using nitrogen substitution method. (Nitrogen micro-nano bubble generation.)
■ OHR MIXER is used to react between organic solvent and CO2 gas.
 The reaction time was shortened from 11 hours to 6 to 7 hours, and the amount of CO2 gas used was reduced by half.
■ Paper mill T uses OHR MIXERs to ozonize 5,000m3/day of colored wastewater without wasteozone decomposing facilities.
■ Urethane sponge manufacture uses OHR MIXER to increase the number and make finer the sponge pores.
03It is a technology that mixes oil and water so they become one fluid and no longer separated. It is used in a wide range of fields from food production to chemical reaction.
Disadvantages and limitations
of conventional technologies :
OHR Technology :
To emulsify without adding emulsifier (chemical),
very high pressure is necessary.
In the case of light oil and water emulsification,
it can be emulsified with one-pass without adding
an emulsifier at a pump pressure of only 0.3MPa.
Large size, complicated and expensive emulsification equipment
is necessary.
One OHR MIXER + one pump replaces
high pressure emulsification equipment.
Regular specialist maintenance and parts replacement are required.
Therefore, impractical in rural areas.
The OHR MIXER has no moving and replacement parts.
So completely maintenance free.
A lot of emulsification equipment is needed
when making a large amount of emulsified liquid
because treatment capacity per unit is small.
One OHR MIXER + one pump can treat up to 15,000L/min.
Real cases ■ High pressure emulsification equipment worth $200,000 was replaced by OHR MIXER for only $3,800, and is used in a
 production line. OHR MIXER’s pump pressure is 1/100 of the previous conventional equipment. See details
■ OHR MIXER is used to make a large amount of pork bone soup (emulsified liquid) very quickly.
■ Delivery records of more than 270 cases.
04It is a technology that uniformly mixes small amounts of additives into liquid in order to produce foods, beverages, chemical products, etc.
Disadvantages and limitations
of conventional technologies :
OHR Technology :
Continue mixing by rotating the impellers in a large tank
until uniform dispersion is completed.
Instantaneously disperses uniformly with one pass.
Just pass A fluid and B fluid through the OHR MIXER.
Mixing over a long period of time with large,
complicated and expensive equipment.
By using OHR MIXER and a pump,
uniform mixing is completed in one pass.
Periodic disassembling and cleaning requires a lot of time
and labor because there are many components.
The OHR MIXER has a self-cleaning function. So in most cases
disassembling and cleaning is unnecessary, and washing is completed
by passing the washing solution through the OHR MIXER.
Real cases ■ Food oil manufacturer N uses OHR MIXERs to uniformly disperse an ultra-low additive of 3.0ppm (three parts per million)
 into cooking oil in all of its plants. See details
■ Chemical company D uses OHR MIXERs for mixing a trace amount of water into organic solvents. These could not be uniformly
 mixed when using all kinds of previous mixing equipment, but they were uniformly mixed for the first time using the OHR MIXER.
■ OHR MIXER is used to uniformly disperse oil based perfumes in a highly viscous liquid.
■ Food manufacturer R uses OHR MIXER to disperse vitamin C powder into cooking oil. See details
05It is a technology that is mainly used for wastewater treatment to decompose persistent substances and pigments. Ozone water is also sprayed for bacteria killing and deodorization.
Disadvantages and limitations
of conventional technologies :
OHR Technology :
Bubbling over a long period of time in wastewater
pooled in a large reaction tank is necessary
which means ozone reaction efficiency is very low.
Total wastewater and ozone gas contact and reaction
in the OHR MIXER. See details
A large amount of unreacted ozone gas is released,
so waste ozone decomposing equipment is absolutely necessary.
There is almost no unreacted ozone gas.
Therefore, ozone treatment is possible without
waste ozone decomposing equipment.
A large reaction tank, a large ozonizer, and waste
ozone decomposing equipment are necessary.
So the total cost is very high.
Compared with the conventional system, the ozone treatment
equipment can be significantly downsized. A factory introduced
OHR system at a low price of 1/3 of the conventional system.
Real cases ■ Paper mill T uses OHR MIXERs to ozonize 5,000m3/day of colored wastewater without waste ozone decomposing facilities.
■ Dioxins that are not supposed to be decomposed by ozone alone were in fact decomposed using an OHR MIXER. See details
■ 3,000Nm3/min of exhaust gas that gave off a strong bad odor at an electric arc furnace was completely deodorized by spraying
 high concentrations of ozone water generated by an OHR MIXER.
06It is a technology that mixs chemicals into a liquid to adjust the pH value as required.
Disadvantages and limitations
of conventional technologies :
OHR Technology :
Adjust the pH by rotating the impellers in a large tank.
However there are rapid-wide pH fluctuations between
acidic and alkaline regions due to inadequate mixing.
It’s very difficult to adjust the pH as needed.
The liquid and the pH adjusting agents are completely and
uniformly mixed in the OHR MIXER, so rapid-wide pH
fluctuations due to inadequate mixing can be minimized.
The pH of the liquid in the tank is uneven due to poor mixing
between the liquid and the pH adjusting agents, repeatedly adding
pH adjusting agents is necessary based on the unstable pH value.
So much time and chemicals are wasted.
The injected pH adjusting agent is uniformly mixed
at the moment of passing through the OHR MIXER,
so the agent is not wasted.
Real cases ■ Sugar manufacturer M neutralized strong acid and strong alkali using a neutralization tank. However, they suffered from
 rapid-wide pH fluctuations between acidic region and alkaline region due to inadequate mixing.
 After OHR MIXER was introduced, rapid-wide pH fluctuations were prevented and the amount of caustic soda added could be
 dramatically reduced by approx 30%. See details
Other real case examples of OHR MIXER.  
■ Finely disperse the pigments in organic solvents while oxidizing the pigments. See details
■ In order to break the emulsified state, an extreme amount of shear force is applied to the emulsified liquid.
■ Circulation and mixing to prevent moisture contained in jet fuel from freezing during aircraft flight.
■ Manufacture methane hydrate artificially.
■ Dilute the exact chemical agents concentration as required.

OHR Aerator01They are mainly used in wastewater treatment to supply oxygen to microorganisms and to uniformly churn the aeration tank.
Disadvantages and limitations
of conventional technologies :
OHR Technology :
Conventional air diffusers always clog.
Regular cleaning and replacement is needed.
Never clogs. Even after 15 years, performs just like new.
See details
Draining the tank is necessary to install conventional air diffusers. No need to drain the tank to install.
See details
Advertising high OTR (oxygen transfer rate).
However the high OTR drops down markedly in actual wastewater.
Even in actual wastewater, the OTR is the same as in clean water.
(Alpha value is approx 1.0)
Discharged air bubbles rise up slowly.
Therefore, it is impossible to uniformly churn the tank
and an anaerobic zone is created at the tank bottom.
Discharged air bubbles rise up very fast and
strong circulating flow is generated in the tank.
Sludge does not accumulate on the tank bottom.
They can not improve significantly chemical reactions in chemical
reaction facilities because they have no ability to mix fluids.
OHR has an original powerful mixing function. We have many
real case examples of greatly improved chemical reactions.
Real cases ■ Delivery records of over 3,400 factories. Installing without draining the tank in most cases.
■ OHR AERATORs are used for churning excess activated sludge in a holding tank (SS: 20,000mg/L) in a chemical plant. See details
■ No clogging with intermittent aeration every 12 hours in wastewater that contained high concentration of calcium and
 magnesium (SS: 30,000mg/L). See details
02When liquid containing SS (suspended solids) is put in a tank, SS accumulates on the tank bottom and causes various problems. It is necessary to constantly and strongly churn the tank.
Disadvantages and limitations
of conventional technologies :
OHR Technology :
When the porous air diffusers or agitators are used, they can’t generate
strong water flow that is sufficient to prevent sludge accumulation
in the tank. So sludge accumulates inevitably on the tank bottom.
A powerful suction force is created inside the OHR AERATOR due to
powerful spiral flows generated by “guide vane” in the OHR AERATOR.
So even heavy substances rise easily.
Real cases ■ Even in a 30% lime slurry tank no clogging and the lime slurry strongly rises up even after 19 years. See details
■ After OHR AERATORs replaced the old air diffusers, accumulation was drastically reduced and running conditions improved
 to the point that no accumulation was observed even when water was drained from the tank. See details
■ OHR AERATORs are used for churning and mixing to accelerate Fenton's reaction and prevent accumulation of solid deposits.
03It is a technology that aerates and blows out volatile organic solvents or dissolved gases contained in liquid into the air.
Disadvantages and limitations
of conventional technologies :
OHR Technology :
Bubbling using submerged mechanical aerators or
porous air diffusers is the most common method.
Excessive air and electricity costs are necessary
because these aerators have low efficiency.
Hard to remove substances can not be removed.
VOC and dissolved gas are removed out from liquid by the powerful
gas-liquid mixing function of the OHR AERATOR.
Therefore, its removal efficiency is much higher than submerged
mechanical aerators which look powerful but actually are not.
(*You can also use the OHR MIXER for inline processing.)
Real cases ■ VOC which could not be degassed at all using submerged mechanical aerators could be removed with OHR AERATORs.
■ OHR AERATORs are used to degas VOC from wastewater containing as much as 20,000 to 30,000 mg/L of hydrated lime.
 There was a lot of trouble with porous air diffusers continuously clogging previously. After the OHR AERATORs were installed
 the previous necessary periodic washing was cut down to zero and air blowing reduced by 40%.
■ OHR AERATORs are used to degas sulfurous acid gas contained in waste liquid.
04It is a technology that blows gas in pooled liquid to make gas-liquid contact / reaction.
Disadvantages and limitations
of conventional technologies :
OHR Technology :
A common gas-liquid reaction method is to discharge gas from the
bottom of a bubble column reactor (vertical tank), and liquid flows
from top to bottom in the opposite direction and make contact.
However, simply blowing gas in a tank is very inefficient because
most of discharged gas is released outside the tank
without contacting/reacting the liquid.
Inside the OHR AERATOR, gas and liquid are powerfully
mixed by two special structures.
Therefore, the OHR AERATOR’s efficiency is far superior
to simple bubbling.
(*You can also use the OHR MIXER for inline processing.)
Real cases ■ OHR AERATORs are used to oxidize SO3 into SO4. The efficiency was twice as high as the conventional porous air diffusers.
■ OHR AERATORs are used to blow exhaust gas containing CO2 into wastewater containing slaked lime to produce calcium
 carbonate without clogging.
■ OHR AERATORs are used to aerate and oxidize iron in water to make iron oxide and separate it from the water.

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