Knowledge and mitigation of gazeous emission that can occur at differents steps of digestats post-processing and used (liquid/solid separation, drying, storage, pelletisation, spreading,…) result in a very important chalenge as well at the environmental point of view as economic. These gaseous emission could seriously influence : -The impact of anaerobic digestion sector on ammonia emission from agricultural activities, and enviromental associated impacts (air quality, acidification,…) -The impact of anaerobic digestion sector on climate change (N2O and CH4 emission) -The possibility of substitution of mineral fertilizer by the digestats (ammonia emission is one of the main sources of nitrogen loss on the sector) -The social acceptability of the sector (emission of odorous compounds) In a goal of optimization of the strategies of spreading, or to allow an export from production area, many strategies of post-processing of the digestats can be put in work. Steps of post-processing influence significantly digestat properties and emission behavior during management. The aim of this work is to evaluate the impact of these different strategies for 4 scenario including : one with no particular post-processing to manage a raw digestat, and 3 others with liquid/solid separation step, solid phase drying, and pelletization; the evaluation of impact include each time storage and land-spreading steps. Emissions concerned in this work are NH3, CH4, and N2O (only during storage), and odors (measured with dynamic olfactometry) Results allow to define post-processing strategies according with a goal of emission mitigation on the whole process ; According to the post-processing of digestats applied, we can define steps on which mitigation or reduction of emission should focus, in the aim of improving the enviromental balance.