Degradation and anaerobic fermentation of wheat straw affected by Trichoderma asperellum 1285

To improve the biogas production efficiency of straw in anaerobic fermentation,wheat straw was pretreated with Trichoderma asperellum 1285,a newly isolated strain degiading wheat straw. The time of pretreatment for wheat straw by the strain was determined,and the effect of pretreated wheat straw on anaerobic fermentation at mesospheric temperature[( 37 ± 1) ℃]was investigated. T. asperellum 1285 showed strong degradation abilities for the lignocelluloses of wheat straw,especially for lignin. Compared with control,the degradation rate of lignin was improved by 53. 09%,while the degradation rates of dry matter,hemicelluloses and cellulose were reduced by 55. 89%, 16. 08% and50. 91%,respectively 8 d after degradation. Scanning electron microscope( SEM) and Fourier transform infrared spectroscopy( FTIR) confirmed the effective degradation of lignin and intactly maintained cellulose. Total gas production and methane production of pretreated wheat straw for eight day in anaerobic fermentation were( 14 774. 30 ± 216. 56) ml and( 7 638. 90 ± 165. 36) ml,14. 05 % and 16. 01 % higher than those of control. The results indicated that T. asperellum 1285 could improve the anaerobic fermentation efficiency of wheat straw.