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Outline
Microbial-based compound enzyme was in-situ prepared using food waste as the sole substrate in this study, and the effect and mechanism of ultrasonic combined with enzymatic pretreatment on methane production of food waste was investigated systematically. Results showed that the combined pretreatment could enhance the methane production of food waste, which was higher than that of single ultrasonic or enzymatic pretreatment, while increased the enzyme dosage could further improve the methane production. The maximal methane yield could reach (369.86±14.06)mL/g VS, which was 57.21% higher than that of the unpretreated food waste. The mechanism dissection revealed that the combined pretreatment promoted the decomposition of biomacromolecules in food waste, which was transferred from solid to liquid phase, thereby improving the biodegradability of fermentation substrate. Meanwhile, it was found that the combined pretreatment changed the protein secondary structure and destroyed the surface morphology of the food waste, and the degradation sequence of the main components in food waste was protein→ lipid → starch. Moreover, the combined pretreatment reshaped the microbial community during the anaerobic digestion process by altering the characteristics of food waste, and the enrichment of Methanosaeta, a kind of acetotrophic methanogen, further enhanced the methane production.
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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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