Impact of sludge mechanical behaviour on spatial distribution parameters obtained with centrifugal spreader

International audienceThe impact of pasty materials rheological behaviour on spatial distribution parameters obtained with centrifugal spreader, i.e. spinning disc system, was studied. Kaolin suspensions were used. To model their rheological properties, a Herschel-Bulkley equation was used, which is consistent with the literature. Experiments were performed with a specific spreading device (a vane with no disc) and with the CEMOB, a bench dedicated to the analysis of organic fertilisers spreading. Results showed that radial distribution of the 3D spread patterns is clearly dependent on size and density of the particles, both of them being related to the material consistency. Angular distribution also tends to follow similar tendencies. This study presents a new approach to analyse organic spreading and opens the way to more developments