Dioxide decontamination of older buildings is dust really ......Andrew Hill Biocontainment...
Transcript of Dioxide decontamination of older buildings is dust really ......Andrew Hill Biocontainment...
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Chlorine Dioxide decontamination of older buildings ‐ is dust really an issue?‐ is dust really an issue?
CSIRO AUSTRALIAN ANIMAL HEALTH LABORATORY ‐ GEELONG
Shane Riddell, Andrew Hill, Neil Slater, Greg Smith
Officially opened in 1985 (33 years old)
Designed in the seventies…..
Australian Animal Health LaboratoryWhat is the problem?
Chlorine Dioxide decontamination of older buildings ‐ is dust really an issue? | Andrew Hill2 |
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Chlorine Dioxide decontamination of older buildings ‐ is dust really an issue? | Andrew Hill3 |
PC‐3 laboratories are contained in 3 large suites (up to ~2000m3/70000ft3)
False ceiling
B dl d d t & bl
Australian Animal Health LaboratoryWhat is the problem?
Bundled data & power cables
PC3 Laboratory spaces have never been fumigated.
PC4 and animal spaces ‐ formaldehyde
Chlorine Dioxide decontamination of older buildings ‐ is dust really an issue? | Andrew Hill4 |
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Chlorine Dioxide decontamination of older buildings ‐ is dust really an issue? | Andrew Hill5 |
Chlorine Dioxide decontamination of older buildings ‐ is dust really an issue? | Andrew Hill6 |
Any volunteer cleaners in the house?
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Compliance alignmentRegulatory audit finding:
• Remove ceiling tiles ‐ Non‐Compliance.
• Must demonstrate fumigation is possible – 5 year variation
Fallout
• Major works required – full compliance for recertification
$ $ ($ $ )• AU$250m – AU$800m ($180m ‐ $600m) over 5‐7 years.
• Formaldehyde fumigation not an option for regular treatment
Chlorine Dioxide decontamination of older buildings ‐ is dust really an issue? | Andrew Hill7 |
Chlorine DioxideIs this a viable option for us?
• A true gas• Peer laboratories have shown efficacy• Peer laboratories have shown efficacy• No ‘off‐gassing’• Enhanced safety cf. formaldehyde
• Possible to accommodate large spaces
Chlorine Dioxide decontamination of older buildings ‐ is dust really an issue? | Andrew Hill8 |
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Evaluation of Chlorine DioxideMinimum disruption for maximum time
• Penetration• Dust
• Acoustic tiles
• Bundled cables
• Relevant efficacy
Chlorine Dioxide decontamination of older buildings ‐ is dust really an issue? | Andrew Hill9 |
Dust Penetration
Chlorine Dioxide decontamination of older buildings ‐ is dust really an issue? | Andrew Hill10 |
http://www.powdertechnologyinc.com/test‐dust‐contaminants/test‐dust‐history/#
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Chlorine Dioxide decontamination of older buildings ‐ is dust really an issue? | Andrew Hill11 |
Test Chamber
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BI resultsPaper strips
Glass fibre discs
Chlorine Dioxide decontamination of older buildings ‐ is dust really an issue? | Andrew Hill13 |
All negative
Acoustic tiles ‐ penetration Mylar wrapWith cut/split
Mylar wrap
Chlorine Dioxide decontamination of older buildings ‐ is dust really an issue? | Andrew Hill14 |
Zero penetration
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Acoustic tiles – without Mylar covering
Chlorine Dioxide decontamination of older buildings ‐ is dust really an issue? | Andrew Hill15 |
Acoustic tiles ‐ without Mylar covering
All negative
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Acoustic tiles‐dust
All ti
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All negative
Cable bundles
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Diluent Hendra (n=3x3) Ebola (n=1x3)
CD
PBSA* Kill Kill
Blood* No Kill No Kill
Real world challenges
CD Blood No Kill No Kill
Soil* Mixed (inconsistent) Mixed
HCHO
PBSA* Kill Kill
Blood* No Kill No Kill
Soil* Mixed (inconsistent) Mixed
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*Each on Lab gown, Stainless Steel coupon, Suit visor & Suit body
• Chlorine dioxide effectively penetrates dust, cable bundles and acoustic tile material
• Mylar wrap provides protection – insert not decontaminated
Conclusions
y p p p
• Facility can be fumigated but tile inserts must not be disturbed
• Chlorine dioxide is efficacious against agents in use• Gross cleaning remains an essential part of facility decontamination
• Currently major works are still being planned
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Australian Animal Health LaboratoryAndrew HillBiocontainment Microbiologist
t +61 3 5227 5451e [email protected]
Australian Animal Health LaboratoryShane RiddellBiorisk Virologist
t +61 3 5227 5464e [email protected]
Thank you
e [email protected] e [email protected]
CSIRO ‐ AUSTRALIAN ANIMAL HEALTH LABORATORY