Assessing nitrogen losses after sewage sludge spreading: a method based on simulation models and spreader technological performances
Résumé
A study is carried out in order to discriminate different spreading technologies and improve them regarding their environmental performances. We define 45 sewage sludge spreading scenarios covering a wide range of situations in France. Several models are used to (i) assess nitrogen losses due to sewage sludge spreading and (ii) calculate additional flow resulting from the technologies performances such as spatial distribution heterogeneity, application rate accuracy and soil compaction of the spreading machine. NH3 volatilisation due to the spreader performances is generally low and the highest for splash plate technology. Additional emissions are mainly caused by application rate accuracy problems. It is not possible to link NO3 leaching to the technologies performances: this kind of emissions greatly depends on soil and climate conditions. Denitrification greatly increases in sensitive sites and observed differences between scenarios are only due to the specific compaction impact of each spreader.
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