Influence of nano-Fe3O4 biochar on the methanation pathway during anaerobic digestion of chicken manure

被引：15
作者：
Di, Lu [1 ,2 ]
Wang, Fang [1 ,2 ]
Li, Siyu [1 ,2 ]
Wang, Hao [1 ,2 ]
Zhang, Deli [1 ,2 ]
Yi, Weiming [1 ,2 ]
Shen, Xiuli [3 ]
机构：
[1] Shandong Univ Technol, Coll Agr Engn & Food Sci, Zibo 255049, Shandong, Peoples R China
[2] Shandong Res Ctr Engn & Technol Clean Energy, Zibo 255049, Shandong, Peoples R China
[3] Acad Agr Planning & Engn, Key Lab Energy Resource Utilizat Agr Residue, Minist Agr & Rural Affairs, Beijing 100125, Peoples R China
来源：
BIORESOURCE TECHNOLOGY | 2023年 / 377卷
基金：
中国国家自然科学基金;
关键词：
Methane production; Ammonia inhibition; Microbial analysis; Direct electron transfer; Syntrophic acetate oxidation; MICROBIAL COMMUNITIES;
D O I：
10.1016/j.biortech.2023.128979
中图分类号：
S2 [农业工程];
学科分类号：
0828 ;
摘要：
Volatile fatty acids and ammonia nitrogen (AN) accumulate during anaerobic digestion (AD) of high N substrates, such as chicken manure (CM), causing decreases in methane yield. Previous research found that the addition of nano-Fe3O4 biochar can alleviate the inhibition caused by acids and ammonia and increase methane production. The mechanism of enhanced methane production in nano-Fe3O4 biochar-mediated AD of CM was explored in depth in this study. The results showed the lowest AN concentration in the control and nano-Fe3O4 biochar addition groups were 8,229.0 mg/L and 7,701.5 mg/L, respectively. Methane yield of volatile solids increased from 92.0 mL/g to 219.9 mL/g in the nano-Fe3O4 biochar treatment, which was attributed to the enrichment of unclassified Clostridiales and Methanosarcina. The mechanism of nano-Fe3O4 biochar in AD of CM under high AN level was to improve methane production by promoting syntrophic acetate oxidation and facilitating direct electron transfer between microorganisms.
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页数：10
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