addition of VPW allowed a greater degradation of VS in batch tests.
VPW added as co-substrate supplied carbon to the medium, thus
enhancing the C/N ratio and improving methane yields.
3.2. Effect of HRT decrease
In order to avoid possible inhibitions during the first experimental
period of 25 d HRT, low organic loading rate (OLR) was applied to
both reactors. R1 methane yield obtained at HRT of 25 d resulted in a