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Targeted addition of CeO2 nanoparticles to promote methane production in anaerobic digestion systems of wheat straw

文献类型： 外文期刊

作者： Liu, Yang 1 ; Ye, Xiaomei 1 ; Xiao, Qingbo 1 ; Wang, Chengcheng 1 ; Jia, Zhaoyan 1 ; Cao, Chunhui 1 ; Du, Jing 1 ; Kong, Xiangping 1 ; Xi, Yonglan 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Nanjing 210014, Peoples R China

2.Minist Agr & Rural Affairs, Jiangsu Collaborat Innovat Ctr Solid Organ Waste R, Key Lab Crop & Livestock Integrat, East China Sci Observing & Expt Stn Dev & Utilizat, Nanjing 210014, Peoples R China

3.Jiangsu Univ, Sch Agr Engn, Zhenjiang 212013, Peoples R China

关键词： Anaerobic digestion; Wheat straw; Methane; Cerium dioxide; Nanoparticles

期刊名称：JOURNAL OF CLEANER PRODUCTION （ 影响因子：11.072； 五年影响因子：11.016 ）

ISSN： 0959-6526

年卷期： 2022 年 377 卷

页码：

收录情况： SCI

摘要： As a large agricultural country, China produces a large amount of wheat straw each year that needs to be treated harmlessly. Anaerobic digestion (AD) has a great potential to produce clean energy biogas while treating wheat straw. AD as a typical fermentation process, the regeneration of NAD(+) is achieved by fermentation using NADH to reduce metabolic intermediates and therefore there is a lack of reduction capacity in the metabolic process. The low reducing power of the digestion system and the low methane yield of wheat straw in the AD process have limited the further development of this technology. Cerium dioxide nanoparticles (CDNs) are known for their excellent reducing powers. At the same time the large amount of cerium contained in the earth provides the conditions for its large-scale use. In this study, we evaluated the effects of CDNs on the AD of wheat straw. The CDNs were successfully prepared via hydrothermal synthesis. The particle size of CDNs was about 5 nm, the measured specific surface area was 168.02 m(2)/g, and the zeta potential was 10.70 mV. Experiments involving volatile fatty acids (VFAs), cyclic voltammetry curves, electrochemical impedance spectroscopy, oxidation-reduction potential, and NADH/NAD(+) showed that CDNs effectively enhanced the reducing power and utilization of VFAs. Additionally, the cumulative methane production of the C10 group was 20.15% higher than CK group, reaching 367.78 mL CH4/g.VS. The cumulative methane production was well fitted using the modified Gompertz equation (R-2 = 0.99677). Analysis of microbial community structure showed that CDNs increased bacterial abundance in hydrolytic acidification. The reduction ability of CDNs is very important for the improvement of the methane production efficiency of AD, which is of great interest for the study of nanoparticles that promote AD.

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