This diagram is similar to the others shown, however, it has the addition of recirculating some of the reactive oxygen species back into the building. In the case of handling municipal solid waste (city/residential garbage), the tipping floor in the transfer station will always have the odor of the garbage. When you recirculate some activated oxygen air back into the tipping floor area, it has the benefit of neutralizing the odorous dust that collects on all surfaces, even those in the ceiling area. That helps to keep fugitive odors minimized as the overall odor of the building is kept minimized.
This suppresses the odor given off by the building that would otherwise build up over the years and increase in general facility odor. This advantage prevents that and will kill flying insects when the facility is closed up nightly and on weekends. It will also work to reduce odor in buildings were there is organic/odorous dust on inaccessible surfaces.