Temperature vs Bacteria and Virus - May 2020 Issue

Temperature vs Bacteria and Virus - May 2020 Issue

With evidence provided by the WHO (World Health Organisation): Thermal Inactivation OfBacteria, Viruses and Protozoa in 2015; it is proven that higher temperatures dramatically shortens the inactivation time of bacteria and viruses.

Example 1 (Hepatitis A): At 75°C, it takes 30 seconds for a 99.999% inactivation of Hepatitis, equivalent toa 5-log reduction (Parry & Mortimer 1984, a method for estimating residual infections after heat treatment). An increase of just 5 °Cto 80°Cdramatically reduces the time to for a 99.999% inactivation of the virus to 5 seconds.

Example 2 (Coronavirus): At 47°C, it takes 19 hours for a 99.99% inactivation of coronavirus, equivalent to a 4-log reduction. An increase of 8°Cto 55 °Creduces the time for a 99.99% inactivation of the virus to just 2 hours.

Setting Degrees (°C) Hours
In which degrees take how long for a 99.99% inactivation of coronavirus 47 19
55 2

In short there is a clear positive correlation between temperature and the inactivation of bacteria and viruses.

How does our DD1 Classic perform in reduction of bacteria?

EcoAir commissioned a trusted SGS report on the effectiveness of running the DD1 Classic in a chamber to determine the bacteria reduction rate. This report asserts a 95.2% elimination of bacteria in an hour within a 7.7m3 chamber DD1 Classic.

During dehumidification, the Desiccant technology not only reduces the humidity of your environment but also sterilizes your environment by reducing the concentration of microorganisms and bacteria and inactivating viruses.

Test Item Unit Before processing Processing 1 hour Elimination ratio (%)
Total Bacteria Counts CFU/m3 3100 150 95.2

The engine in our Desiccant dehumidifier is our 'Desiccant Rotor'; which absorbs smaller particles including water molecules, bacteria, micronism and virus particles. Meanwhile, particles which attach onto the 'Desiccant Rotor' rotate into the heated zone of the unit which is subjected to UHT (Ultra High Temperature of 200°Cto 500°C) for 30 seconds. The thermal energy serves two purposes: detaching the water molecules from the 'Desiccant Rotor' and also incinerating and inactivating bacteria, microorganisms and virus particles.

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  1. WHO (World Health Organisation), WHO/FWC/WSH/15.02, BOIL WATER (2011)
    [WHO] : https://www.who.int/water_sanitation_health/dwq/Boiling_water_01_15.pdf
  2. J. V. Parry P. P. Mortimer, The heat sensitivity of hepatitis A virus determined by a simple tissue culture method (1984)
    [NCBI] : https://www.ncbi.nlm.nih.gov/pubmed/6094725
  3. J. gen. Virol., 56, 235-240. Thermal Inactivation Studies of a Coronavirus, Transmissible Gastroenteritis Virus (1981)
    [Microbiology Society] : https://doi.org/10.1099/0022-1317-56-2-235
  4. J Virol Methods, Inactivation of the coronavirus that induces severe acute respiratory syndrome, SARS-CoV (2004)
    [NCBI] : https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7112912/
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