Evaluation of a technology designed to remove airborne microorganisms, allergens and volatile organic compounds (VOCs) from the laboratory animal environment

摘要

This unique and innovative development was funded by NASA and has been shown to reduce levels of airborne microorganisms, allergens and other organic materials. The system represents a new generation in air quality management, combining for the firsttime, the dual roles of Ultra-Violet Germicidal Irradiation (UVGI) and Photo-Catalytic Oxidation (PCO); both of these processes are scientifically acknowledged to reduce airborne contamination. Contaminated air is drawn into the system by a fan. It passes over the catalyst bed where it is immobilized on the TiO_2 catalyst. UVGI irradiation on the catalyst produces a 'mist' of hydroxyl radicals and super-oxide ions that oxidise the organic bonds within the organic matter adsorbed on the catalyst and break it down to C02 and H_2O vapour. The technology will significantly reduce organism numbers with a single passage through the PCO + UVGI oxidation process, but since it is designed for constant operation a significant and sustained reduction in airborneorganism numbers is recorded.