Abstract
If Foot-and-mouth disease virus (FMDV) survives in compost or waste at a composting facility, it can spread to outside farms when the compost is turned. Therefore, it is important to investigate dispersion properties of aerosols caused by turning from a composting facility. And then water spraying was examined to inhibit dispersion as a countermeasure. The ratio of aerosol concentration at a certain distance from the facility to the concentration generated by turning inside the facility (dimensionless concentration) for all particle sizes was close to 0 at a distance greater than or equal to 40 m from the facility. Within 40 m the dimensionless concentration reduced as the distance was getting longer from the facility. The concentration of 0.3 μm ≤ aerosol diameter < 0.5 μm was the highest at 108 particles m-3 in the facility. An equation to predict aerosol concentration at any distance from a facility was deduced. Spraying was an effective measure to suppress the dispersion of aerosol, and the reduction rate was 90%.
