Abstract: Lab-scale experiments were conducted using the Automatic Methane Potential Test System (AMPTS) under the condition of 35℃ to investigate the influence of swine manure total solid (TS) concentrations of 2%，6%，10% and 14% on the anaerobic digestion and methane production The results showed that biogas output from all treatments were maximum in the first day，and gradually declined with the digestion days The higher solid concentration required longer digestion time The larger methane concentration of biogas was obtained from low TS treatment in the beginning period However，methane concentration from high TS treatment gradually increased as the extension of digestion time Methane concentrations of biogas from TS of 6% treatment were highest in the later periods of experiment，and could reach 76.1% In the range of TS of 2%-10%，the larger cumulative methane production was obtained from the higher concentration，other than the cumulative methane production from TS of 14% which was no significant differences compared with that from TS of 10%To calculate the methane yield per CODcr from different treatments of TS of 2%，6%，10%，and 14%，was 311.5 409.7，488.8，and 357.4mL/g，respectively，and the methane yield per VS from different treatments of TS of 2%，6%，10%，and 14%，was 330.1 ，491.3，473.1，and 491.3mL/g，respectively The larger methane yield was obtained from TS of 6% and 10%Research results showed that solid concentration of swine manure had a great influence on anaerobic digestion process and the methane yield Selecting suitable solid concentration was beneficial to improve the methane production of anaerobic digestion The experiment results provide useful reference data for the selection of biogas digesters design parameters and support the compilation of GHG inventory from manure management

Key words: Swine manure, Anaerobic digestion, Biogas, Methane yield