Modified gompertz kinetic study of methane production from anaerobic digestion of recycled paper mill sludge

The anaerobic digestion is an available treatment technique of sludge from recycled mill paper (RPMS), this method avoids environmental problems and produce methane, which is a renewable energy. The anaerobic treatment of the RPMS was studied using a 1L CSTR reactor at laboratory scale under mesophilic conditions. A kinetic study was carried out using two models in order to compare and adjust the experimental results. The experimental results show that the RPMS methane yield is 159 Nml CH4/g VS. The load of 2.5 g VS/L gives the better methanogenic potential. The organic loading rate reaches in this experiment 4.61 g VS / Ld. The first-order kinetic and the modified Gompertz model results show that the difference between the predicted and measured methanogenic potentials is higher in the first-order kinetic model (5 – 27 %) than in the modified Gompertz model (1 – 13%) following the applied load value. the modified Gompertz model showed the best fit for the substrates used.
Proceedings of the 26th European Biomass Conference and Exhibition, 14-17 May 2018, Copenhagen, Denmark, pp. 849-854