Envirosharp - Odor removal, air and surface decontamination
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EnviroSharp™ service providers utilize the EnviroSharp™ Process for odor removal, air and surface decontamination. The EnviroSharp™ Process deploys a proven technology called photocatalytic oxidation (PCO) to produce simultaneous, interrelated forms of oxidation to eradicate airborne organic contaminants.

The EnviroSharp™ Process uses a five-phase process for PCO. This five-phase process includes:

  1. germicidal irradiation
  2. reduction-oxidation (called Redox)
  3. electrochemical production of trivalent oxygen and
  4. semiconductor production of hydroxyl radicals. The EnviroSharp™ decontamination unit is also equipped with
  5. HEPA filtration.

PCO uses the energy from photons of light sources to activate a catalyst. Upon activation, absorbed gases, particularly molecular oxygen (O3), water vapor (H2O2), and contaminant species, can participate in surface-mediated reactions that, under appropriate operating conditions, can produce and desorb product species, notably carbon dioxide (CO2) and H20.

Semiconductor materials provide solid surfaces that can influence both the chemical reactivity of a wide range of adsorbates and the ability to initiate, propagate, and terminate light-induced oxidation-reduction (redox) reactions – or PCO. Upon photoexcitation of several semiconductors, simultaneous redox reactions occur. The conversion often accomplishes either a specific, selective oxidation or a complete oxidative degradation of an organic reactant, in which the carbon bound in the reactant species is converted to carbon dioxide. Molecular oxygen (O2) is typically the oxidizing agent. Incident photons from the light sources that initiate these reactions are in a wavelength region varying from the visible (500 nm) to high-energy range of the UV spectrum (250 nm), depending upon the band-gap of the photocatalyst. The semiconductor material that acts as the photocatalyst is often stable to the photolysis conditions, particularly when a metal oxide such as titanium dioxide (TiO2) is employed. The gas-phase species are adsorbed and then react on solid surfaces, referred to as heterogeneous (gas/solid) photocatalysis.

PHASE 1 – Germicidal UV Radiation

Air comes into the bottom rear of the unit. High intensity germicidal irradiation is lethal to incoming airborne microorganisms, creating peptide bonds within their DNA, preventing them from further replicating. All other slices of the UV Band are used as well.

PHASE 2 – Powerful Singlet Oxygen and Oxyradical Plasma

A dense cloud of powerful molecular oxidizers attack bio-particles and rapidly begin breaking the carbon bonds that form their cellular matter. Approximately 70% of the system’s energy goes into creating this powerful sterilizing plasma gas, which includes singlet oxygen, superoxide, hydrogen peroxide and three oxyradicals: hydroxyl radicals, the atomic oxygen radical, and hydroperoxide radicals. These agents remain in the chamber.

PHASE 3 – Concentrated O3, H2 O2

Purified trivalent oxygen, called ozone, is produced which contributes to oxidization within the chamber and production of more oxyradicals. Bulk ozone and hydrogen peroxide molecules leave the top of the unit to continue their work outside the chamber for another 30-45 minutes before decaying harmlessly back to the natural elements from which they were made.

PHASE 4 – Photocatalytic Production of Hydroxyl Radicals

Special nanoparticles coated on the entire inner chamber wall undergo a photocatalytic reaction driven by the UV energy field. They convert water vapor in the air or feed gas into more hydroxyl radicals projecting from the entire inner surface. The new oxyradicals break up passing organic matter and generate more oxyradicals from the O3 concentration present.

PHASE 5 – HEPA Filtration, Optional Supplemental Feed Gas