Dioxide decontamination of older buildings is dust really ......Andrew Hill Biocontainment...

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1 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 Laboratory What is the problem? Chlorine Dioxide decontamination of older buildings is dust really an issue? | Andrew Hill 2|

Transcript of Dioxide decontamination of older buildings is dust really ......Andrew Hill Biocontainment...

Page 1: Dioxide decontamination of older buildings is dust really ......Andrew Hill Biocontainment Microbiologist t +61 3 5227 5451 e andrew.hill@csiro.au Australian Animal Health Laboratory

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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

Chlorine Dioxide decontamination of older buildings ‐ is dust really an issue?  |  Andrew Hill12 |

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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

Chlorine Dioxide decontamination of older buildings ‐ is dust really an issue?  |  Andrew Hill16 |

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Acoustic tiles‐dust

All ti

Chlorine Dioxide decontamination of older buildings ‐ is dust really an issue?  |  Andrew Hill17 |

All negative

Cable bundles

Chlorine Dioxide decontamination of older buildings ‐ is dust really an issue?  |  Andrew Hill18 |

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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

Chlorine Dioxide decontamination of older buildings ‐ is dust really an issue?  |  Andrew Hill19 |

*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

Chlorine Dioxide decontamination of older buildings ‐ is dust really an issue?  |  Andrew Hill20 |

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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