Abstract: A screening and recycling project of a waste landfill in operation was taken as the research object， by detecting the concentration of ammonia gas in different areas of the workshop， the distribution results of the workshop odor represented by ammonia gas were obtained. The results showed that the feeding area， trommel screen equipment area and humus blanking area of the screening workshop were the key deodorizing areas. When designing the deodorizing system， the spraying volume and frequency of deodorizing liquid should be increased in these areas. The detection results of the duration of the deodorizing effect showed that after the deodorant spraying was stopped， the odor concentration slowly recovered， but after seven minutes， the recovery speed accelerated. Therefore， when the discharge interval was less than eight minutes， a more sustainable deodorization effect could be obtained. The relevant results could provide references for the refinement of deodorization system design of similar projects.

Key words: screening and recycling, landfill, deodorization, plant deodorant