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Ultrasonic combined with enzymatic pretreatment strengthens anaerobic digestion of food waste
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Jia-xin CHEN1, Yi-ming YAN1, Shi-man LIU1, Yi-zhuo FENG1, Qiang FEI1, 2, Ying-qun MA1, 2, *
China Environmental Science | 2025, 45(1) : 223 - 233
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China Environmental Science | 2025, 45(1): 223-233
• Solid Waste •
Ultrasonic combined with enzymatic pretreatment strengthens anaerobic digestion of food waste
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Jia-xin CHEN1, Yi-ming YAN1, Shi-man LIU1, Yi-zhuo FENG1, Qiang FEI1, 2, Ying-qun MA1, 2, *
Affiliations
  • 1.School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, China
  • 2.Shaanxi Key Laboratory of Energy Chemical Process Intensification, Xi’an Key Laboratory of C1Compound Bioconversion Technology, Xi’an Jiaotong University, Xi’an 710049, China
Published: 2025-01-20
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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.

food waste  /  ultrasonic  /  microbial-based compound enzyme  /  anaerobic digestion  /  methane  /  microbial communities
Jia-xin CHEN, Yi-ming YAN, Shi-man LIU, Yi-zhuo FENG, Qiang FEI, Ying-qun MA. Ultrasonic combined with enzymatic pretreatment strengthens anaerobic digestion of food waste[J]. China Environmental Science, 2025 , 45 (1) : 223 -233 .
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  • Receive Date：2024-05-21
  • Online Date：2026-03-18
  • Published：2025-01-20
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  • Received：2024-05-21
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Affiliations
    1.School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, China
    2.Shaanxi Key Laboratory of Energy Chemical Process Intensification, Xi’an Key Laboratory of C1Compound Bioconversion Technology, Xi’an Jiaotong University, Xi’an 710049, China
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表12种不同金属材料的力学参数
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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