Enhanced methane production and its kinetics model of thermally pretreated lignocellulose waste material

Schematic representation of lignocellulose material of anaerobic conversion process. [Display omitted] •Effect of substrate concentration on CH4 production from paper mill sludge was studied.•Methane yield and biodegradability were increased up to 303mL of CH4/g VS and 73%.•Specific methanogenic activity show linear manner for increased substrate concentration.•Modified Gompertz and logistic models fits and reproduce experimental data.•The net energy of 8735kJ was gained after thermal pretreatment. The objective of the study was to assess the effect of substrate concentration by specific methanogenic activity (SMA) of thermally pretreated pulp and paper mill sludge. Different substrate concentration through food to microorganism ratio varied from 1.0 to 3.0 was carried out in a mesophilic condition as biochemical methane potential assay. Experimental results offered that cellulose removal rate spikes up to 60.2%. The specific methane gas production and biodegradability were increased up to 303mL of CH4/g VS and 73% respectively. By increasing the substrate concentration, SMA was significantly improved in a linear manner. The net energy of 8735kJ was gained after thermal pretreatment. In addition to that three kinetics model were used, among that the modified Gompertz and logistic function models represent and reproduce the experimental data, while the earlier has the better fit.