What is a Hydroxyl Generator?
generators have replaced ozone generators for certain mold, water and fire damage restoration projects. Hydroxyls
are formed in nature by the reaction of UV light from the sun disassembling water vapor (H20) into hydroxyl radicals
(*OH) which have unpaired electrons. Hydroxyls react with and neutralize pollutants. However, natural hydroxyl
production has little affect on indoor air. Commercial hydroxyl generators duplicate the effects of outdoor hydroxyls
by circulating indoor air through a chamber where hydroxyl reactions occur. Hydroxyl generators also start chain
reactions with contaminants that can spread outside the hydroxyl machine as the pollutants break down.
Hydroxyl generators are widely used by water and fire damage restoration companies along with mold remediation
professionals because the hydroxyl radicals generated are non-toxic to humans and work exceptionally well in hot,
humid environments to remove the same contaminants as ozone along with many more, although over a longer period
of time. Where a two-hour ozone treatment would be sufficient, a hydroxyl generator might take three times as long
to achieve similar results, but the treatment area can generally remain occupied and the hydroxyls do not cause
damage to sensitive materials such as natural rubber and certain adhesives that concentrated ozone could affect.
of Hydroxyl Machines
There are two methods to generate hydroxyls for indoor air purification: Photocatalytic Oxidation (PCO) or
an Advanced Oxidation Process (AOP). Each method has advantages and disadvantages. PCO is the only method that
can be left running unmonitored in occupied spaces without requiring fresh air ventilation. Contaminants are oxidized
by hydroxyls that form along the surface of a UV light-activated catalyst that abstracts hydrogen atoms from water
molecules in the air.
AOP methods produce hydroxyls from chemical reactions that occur in the air, usually in the presence
of UV light without requiring contact with a catalyst. Also called direct hydroxyl production (DHP), the advantage
of AOP is that more hydroxyls can potentially form because production is not limited to a catalyst surface. The
disadvantage is that byproducts including ozone and hydrogen peroxide may reach harmful levels to humans in some
environments, requiring an area to be unoccupied or closely monitored for occupant or worker safety while machines
PCO was developed with a specific intent not to harm occupants in a closed environment. PCO can use either safe-to-view
UV-A black light or shielded UV-C germicidal light and several types of permanent catalysts. AOP includes low-concentration
ozone and/or hydrogen peroxide vapor that breaks down in the presence of UV-C germicidal light. With either method,
the hydroxyls produced quickly react with VOCs and inorganic gases in cascading reactions that can follow the air
stream outside the generator as partially-oxidized contaminants drive futher reactions until they are reduced to
carbon dioxide and water.
Hydroxyl generators are used in the restoration industry in high-humidity environments where ozone is less effective,
especially after floods or fires have been extinguished and materials are very wet. Hydroxyl generators are often
run at the site in the days before serious work starts on a restoration project to help purify the air and prevent
mold from taking hold. Hydroxyl radicals react with over 5,000 compounds and will break apart odors from fire and
smoke, category 2 & 3 water losses, chemical fumes, fuel oil, VOCs, trauma, etc. without damaging sensitive
contents that concentrated ozone might.
Visit the Line of BoiE Hydroxyl Generators
What is Ozone?
Ozone is the second most powerful oxidant in the world, saturates hard-to-reach spaces and leaves no chemical
residue, which is why it is useful for cleaning applications such as mold eradication and odor removal. It also
destroys pathogens such as bacteria and viruses on surfaces making it an excellent disinfectant. Ozone contains
three atoms of oxygen rather than the two in normal air. This extra oxygen atom will quickly combine with or "oxidize"
harmful compounds, causing them to break down. Ozone used in high enough concentrations to kill odors can also
damage the respiratory tissues in humans and animals, and also tissues in plants, requiring it to be used in unoccupied
areas only where pets and plants are removed. Ozone naturally decays back into normal oxygen within a few hours
depending on the temperature.
Ultraviolet Light Ozone Generators
are two ways to make ozone: Ultraviolet Light and Corona Discharge. Both methods occur in nature. Most of the planet's
ozone is generated in the upper stratosphere from high-energy solar radiation (Ultraviolet Light) breaking apart
oxygen molecules which temporarily re-form into groups of 3 (trioxide, a.k.a ozone). Also called the ozone layer,
this gas shields the earth's surface from the sun's most dangerous ultraviolet light and makes the sky appear blue.
Ultraviolet (UV) Light Ozone Generators use low pressure UV lamps that generate multiwavelength
UV light with two peaks, one at the 254-nm light band and another at 185-nm. The 185-nm light produces ozone through
photolysis of oxygen molecules, while the 254-nm light photolyzes ozone back into oxygen, which works against the
ozone production process. This second peak is why low pressure UV lamps produce less net ozone (for the energy
expended) than corona discharge (CD) ozone generators when operating in cool, dry environments. However, UV light
ozone generators produce ozone at a near constant rate, even when the environment is warm and wet, making them
much better in hot, humid conditions. Plus they do not generate byproducts from nitrogen in the air.
Ultraviolet Light Ozone Generators can remove strong odors and sterilize viruses and microorganisms under harsh
environmental conditions such as high heat and humidity. The premium ultraviolet light ozone generators that we
sell are innovative, versatile and can generate shock levels of ozone. Our price point averages 50 to 75 percent
lower than similar output ultraviolet ozone generators sold by competitors. Simply put, we sell serious ultraviolet
ozone generators to customers who want high-performing products at the lowest prices. Plus, we stand behind every
product we sell with a money-back guarantee!
Corona Discharge Ozone Generators
the lower atmosphere, ozone is generated by static electricity (Corona Discharge) during lightening strikes which
also break apart oxygen molecules that temporarily reform as ozone before reverting back to normal oxygen. Corona
discharge is a static shock that can be generated using electricity. The first man-made ozone machine used two
glass tubes wrapped in tin, one inside of the other so that air could circulate in the space between them. When
the surrounding conductor was energized with high voltage it ionized the air near the conductor surface resulting
in an electrical discharge that produced ozone. Corona discharge is the most efficient way to produce a large volume
of ozone from cool, dry ambient air.
Corona Discharge (CD) Ozone Generators use discharge plates with electrodes and an insulating,
dielectric material that supports an electrostatic field without heating up excessively. A transformer is used
to convert standard low frequency household power into high frequency, high voltage that can produce large quantities
of ozone from the ambient air that passes near the plates. Ozone plate technology and transformer design have improved
significantly over the past few years. Compact, double-sided corona discharge plates can produce 8 to 16 grams
of ozone per hour from a single transformer, allowing a small machine to quickly saturate an area with ozone. However,
cool dry air is required for maximum output, and high humidity can result in undesirable corrosion from nitrogen
compounds that accumulate on the plates. When the environment can be controlled corona discharge ozone generators
are the most efficient choice.
High-output Corona Discharge Ozone Machines remove strong odors and sterilize bacteria, viruses and mold spores
in minutes. The portable ozone generators that we sell are the industry's most powerful and durable units, generating
significantly more ozone than the over-priced "metal box" machines advertised everywhere. Whether it's
for a home, vehicle or a business, when you have serious odor problems you'll want a BoiE to do the job quickly
and completely. Simply put, we sell serious commercial-grade ozone generators to consumers who want high-performing
products that do the job fast at the best price point. Plus, we stand behind every product we sell with a money-back
guarantee and great customer service.
Before you enroll in any home inspection school, will they guarantee your satisfaction unconditionally
a month later?
We do. That's the PHII difference!