Air Disinfection

8/4/2019 Air Disinfection

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Media-Specific Disinfection

Surfaces and Air


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Legal Issues

1) It is a violation of Federal law to use an EPAregistered product in a manner inconsistent with itslabeling. Solution strength must be according to label

Applications must be on the label

2) It is a violation of Federal law for a manufacturer tomake real or implied claims for efficacy againstorganisms which are not on the label.

Creates problems when we encounter: FMDV

Anthrax

Norwalk

SARS

Avian Influenza H5N1


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Surface Disinfection = Inactivation in Place

Surface Cleaning = Removal of Contaminants

Commercial products frequently combine disinfectionand cleaning.

Some disinfectants have cleaning properties

Recommendation (at least in clinical settings) cleanwith disinfectant to avoid spreading contamination

Pre-Disinfect Clean Disinfect

Surface Disinfection


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Surfaces

What surfaces might you need to disinfect?

Household Surfaces

Food and Food Prep Surfaces

Clinical Surfaces

Laboratory

Industrial

Farm

Other???


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Concerns for Disinfection of Surfaces

Disinfectant Type/Concentration/Formulation

Contact Time

Type of Organisms/Level of Disinfection

Corrosivity and Other Surface Damage

Toxicity/Residual Toxicity

Other Residues

Odor

Type of Application and Rate


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Concerns for Disinfection ofSurfaces

pH Demand and Interfering Substances Temperature

Water hardness Soil load Biofilm presence Surface microtopography

Precleaning Relative humidity Compatibility Storage of Product/Product age


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Clinical/Dental Surface Disinfectants


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Farm Surfaces

Virkon S (potassium peroxymonosulfate)

Nolvasan S (chlorhexidine diacetate)

Bleach (sodium hypochlorite) Spectrasol (quat)

Alcohols (ethanol and Isopropanol, 70-95%)

Roccal D (quats with bis-n-tributylin oxide)


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Surface Disinfection

In study by CRA Foundation

54 clinical surface disinfectants tested against TB andPolio with and without presence of Blood

7 passed:

Household Chlorox (50:50)

Industrial Chlorox (50:50)

Biosurf Lysol I.C.

Lysol II Spray

Indi-wipes with Lysol


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Ozone Surface Disinfection

Up to 14 PPM Ozone@ 10GPM

Onboard OzoneAnalyzer With Alarms

Exclusive Off-GassingSystem

Spray, Mist and FogApplicators; Spray

Arches Available Advertises a 3 Log Kill

on First Application


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UV Surface Disinfection

Conveyor Belts Food Prep Surfaces

Laboratory andClinical Surfaces

Sterilization ofPackaging

Mail Systems


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Cleaning and Disinfection ofFloors

% Reduction

Soap and water 80.4%

Phenol 99.0%


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Microbial Contamination of MopWater

Soap(CFU/ml)

Phenol(CFU/ml)

Before cleaning 10 20

After cleaning one-third of ward

650 10

After cleaning two-thirds of ward

15,000 30

After cleaningcomplete ward

34,000 20


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Disinfection of Food Surfaces


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Chemical disinfection of Indoor Air

Spraying relatively large particles,

which have a higherwetting capacity, but stay inthe air for less time

Misting

smaller particles that haveincreased penetration anduniformity

Fumigation combination of 2 or more

chemicals producing a

vaporised form of thedisinfectant

Thermal Fogging similar to misting but

involving heating of thedisinfectant to produce a

fine vapour


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Chemical Disinfectants of Air

Chlorine Dioxide

Ozone

VHP

Formaldehyde

Gluteraldehydes

Quat mixtures

Virkon (peroxy compound)

Sporocidin (phenolic)
http://www.minntech.com/ftg/products/microfiber/minncare_bg.html


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Air Disinfection

Chemical Disinfection

Spray, mist, fog, fumigation

UVGI

Ionization/Electrostatic Precipitation

Only one that removes

Photocatalytic oxidation


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UV Air Disinfection

Forced Air or HVAC DuctSystems

Full Air Systems

Upper Air Systems

Re-circulating Systems

Microbial Growth Control On Filter Surfaces


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UV Air Disinfection: Duct Systems

Integrated in to HVAC System


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UV Air Disinfection: Upper Air

Originally designedfor TB sanitariums


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UV Air Disinfection: MGS

Air Disinfection

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