Effects of hydrochar and biogas slurry reflux on methane production by mixed anaerobic digestion of cow manure and corn straw
文献类型： 外文期刊
作者： Yang, Ye 1 ; Wang, Mengyao 1 ; Yan, Su 1 ; Yong, Xiaoyu 1 ; Zhang, Xueying 2 ; Awasthi, Mukesh Kumar 3 ; Xi, Yonglan 4 ; Zhou, Jun 1 ;
作者机构： 1.Nanjing Tech Univ, Bioenergy Res Inst, Coll Biotechnol & Pharmaceut Engn, Nanjing 211816, Jiangsu, Peoples R China
2.Nanjing Tech Univ, Coll Environm, Nanjing 211816, Peoples R China
3.Northwest A&F Univ, Coll Nat Resources & Environm, Taicheng Rd 3, Yangling 712100, Shaanxi, Peoples R China
4.Jiangsu Acad Agr Sci, Inst Circular Agr Res Ctr, Nanjing 210014, Jiangsu, Peoples R China
5.Nanjing Tech Univ, Coll Biotechnol & Pharmaceut Engn, Nanjing 211816, Jiangsu, Peoples R China
6.Nanjing Tech Univ, POB 77, 30 South Puzhu Rd, Nanjing 211816, Peoples R China
关键词： Anaerobic digestion; Cow manure; Corn straw; Hydrochar; Biogas slurry; Microbial community
期刊名称：CHEMOSPHERE （ 影响因子：8.8； 五年影响因子：8.3 ）
ISSN： 0045-6535
年卷期： 2023 年 310 卷
页码：
收录情况： SCI
摘要： This study aimed to enhance methane production from mixed anaerobic digestion of cow manure and corn straw by adding hydrochar and biogas slurry reflux. The hydrochar characterization revealed that it can provide attachment for microbial growth, and abundant surface functional groups (such as C-O, C--O, C-OH, and C-N) for adsorption. Direct interspecies electron transfer (DIET) mediated by surface oxygen-containing functional groups on hydrochar increased the methane yield. The experimental group added with hydrochar and biogas slurry reflux had the highest methane and biogas production (34.40% and 36.98% higher than the control group, respectively). Results demonstrate hydrochar and biogas slurry reflux can improve microorganism species richness in anaerobic digestion systems, in which hydrochar can also improve microorganism species uniformity. Distance-based redundancy analysis showed that the VFAs, and pH had the greatest effects on the composition of the microbial community. The dominant microorganism at the phylum level in AD system were Bacteroidetes, Firmicutes, and Proteobacteria. The addition of hydrochar and biogas slurry reflux can significantly increase the species abundance of Methanobacterium. These results indicate that the addition of hydrochar and biogas slurry reflux can improve the corresponding microbial abundance, in which hydrochar can enhance the redox char-acteristics and DIET between microorganism, biogas slurry reflux can also increase nutrient content of anaerobic digestion system, and collectively promote the methane yield.
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