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This study investigated the pretreatment of rice straw using different soaking solvents (deionized water, nanobubble water, biogas slurry, and nanobubble water coupled with biogas slurry) for 5 days. The study explored the changes in volatile fatty acid content, lignocellulose content, and methane production in different treatments after soaking pretreatment. The results indicated that the treatment of soaking with nanobubble water and the treatment of combing soaking of nanobubble water with biogas slurry both enhanced the pretreatment effectiveness of the rice straw. The treatment of combing soaking of nanobubble water with biogas slurry showed the optimal pretreatment performance, with the volatile fatty acid content reaching 6 470 mg/L. The cellulose degradation rate and hemicellulose degradation rate reached at 12.1% and 23.7% , respectively, and the maximum cumulative methane yield increased by 19.5%.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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