抄録
Peracetic acid（ PAA） is a strong oxidant with excellent sporicidal, microbicidal, fungicidal and virucidal activities. It is effective even at low concentrations and has excellent biodegradability. Dry fogging fumigation with PAA is effective for decontaminating indoor spaces such as laboratories, biological cleanrooms, and is widely used mainly in Europe and North America. On the other hand, condensation due to an unintentional excessive increase in relative humidity during fumigation may cause corrosion of metals, equipment failure and residual odor. The PAA Cycle Decontamination （PACD） system eliminates the risk of unintentional condensation by keeping the relative humidity below 75%. By repeating the cycle of spraying with a fogger and recovery（ collecting） with a dehumidifier during the decontamination time, it is possible to continuously supply PAA gas（ PAA gas can be continuously supplied） while maintaining a constant humidity. This also enables decontamination even when the room temperature is low or the initial humidity is high, without adjusting temperature and humidity conditions in advance. Vaporized PAA passes through a HEPA filter, allowing decontamination of biosafety cabinets. The PACD system greatly expands the possibilities of PAA decontamination.
