Laboratory decontamination tests with IBL technology, carried out by Thales
The experimentation carried out by Thales in 2007 focused on the study of a decontamination process for a laboratory area and the assessment of the decontamination procedure in a highly contaminated atmosphere.
The tests were carried out by the "CYCLONE" decontamination system with the use of 18% hydrogen peroxide, 0.7% acetic acid and 1.5% peracetic acid. This device at the prototype stage (developed by the company IBL) and now patented, vaporizes steam of dry water under pressure (7 bars). The disinfectant is injected into the boiler outlet, so it is the vapor of water that vaporizes it.
The tests confirmed a homogeneous diffusion of the disinfectant and demonstrated a very good vapour disinfection efficiency with reductions of the order of 6 log (test on spores of Bacillus stearothermophilus) after optimizing the decontamination cycle.
These tests contributed to the improvement of the prototype by the relevant remarks made in the conclusions of experiments which revealed that the "CYCLONE" system was a promising solution on the part of the measured decontamination efficiencies and the Compactness of the system.
IBL Specifik has taken into account the comments submitted by Thales and has improved its prototype to obtain today high performance devices (such as VAPBIO and STAMBIO) for spraying a disinfectant solution based on hydrogen peroxide, Concentrations much lower than that tested, and which show equally high disinfection efficiencies (complying with NF T 72-281).
The conclusions and perspectives of these tests
Conclusion on Laboratory decontamination
We have demonstrated optimum efficiency of the CYCLONE system with 18% H2O2 and 1.5% Peracetic acid under the following conditions: 4 min of gassing followed by 20 min of contact time. The "CYCLONE" system allows a homogeneous diffusion of hydrogen peroxide vapour throughout the tested area. However, it requires the intervention of an operator in the laboratory area before the launch of decontamination for the protection of sensitive elements, in particular optics.
Conclusion on the CYCLONE system
The operation of the decontamination device tested clearly showed the efficacy of decontamination by vaporization of hydrogen peroxide with reductions of at least 6 log on the bacteria (spore forms) tested under the conditions Optimized. The vaporization and contact times do not exceed the quarter of an hour. This is the ventilation time to lower the concentration in H2O2 Under the value of VME (1 ppm) before the opening of the room which is important and which determines the total duration of decontamination.
The tests carried out by Thales highlighted a number of improvements that allowed the device to be worn at maturity, particularly at the level of spray nozzles and concentration settings in disinfectant.
In addition to these material modifications, which are easily feasible, more in-depth testing of the disinfectant concentrations to be used would be achieved. The conclusions of these experiments were therefore that the "CYCLONE" system vaporizing hydrogen peroxide was a promising solution for the measured decontamination efficiencies and compactness of the system.
With these conclusions, IBL Specifik has been able to profit from the remarks made by Thales and has improved its prototype (patented) to obtain today high performance devices (such as STAMBIO) that allow to vaporize a disinfectant solution less Concentrated (< 8% of H2O2 (and < 0.2% Peracetic acid) and which show equally high disinfection efficiencies.