Ammonia, carbon dioxide and hydrogen sulfur emissions from stored slurry as affected by spatial and temporally distributed slurry additions

摘要

Animal slurry is a source of environmental pollutants including NH3, CO_2 and H2S. Animal slurry stored in-barn is characterized by the frequent occurrence of surface liquid disturbances. One type of disturbance occurs when new slurry is produced by the animals, which falls into the pit, and alters the equilibrium of the slurry surface and the gas emission patterns. However, information about emissions during and after disturbances is very limited. In this study, an evaluation of the effect of spatial and temporally distributed slurry addition on the total emissions ofNH3, CO_2 and H2S is provided. The emissions of NH3 and CO_2 remained rather constant under steady conditions during storage. Ammonia emissions showed a decrease shortly after performing each addition, followed by an increase, while carbon dioxide emissions showed an immediate increase followed by a sharp decrease. Slurry frequently disturbed by slurry addition caused a fluctuating NH3 and CO_2 emission patterns. Hydrogen sulphide emissions were much higher during disturbances.