Effect of substrate feeding on viscosity evolution of anaerobic granular sludges

摘要

This work aims to describe the effect of the feeding regime of anaerobic activity tests on the limitnviscosity (mlim) evolution of the granules. Batch experiments were performed with 3 differentnsources of substrate: acetate, peptone, and glucose. Despite, the substrate origin was shown tonaffect the mlim evolution of granules, no clear relationship was found between the mlim evolution,ntype of substrate and other granule physico-chemical characteristics (i.e. pH; % of VolatilenSuspended Solid; concentration of exopolymeric substances, divalent cations, P and S). The originnof granules and the substrate feeding regime modify the surface shape of the granules and maynchange granule–granule interactions under a shear stress, thus affecting the evolution of the mlimnvalue during long term reactor operation.