期刊
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
卷 9, 期 6, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2021.106704
关键词
Anaerobic digestion; Cattle manure; Functional prediction; Microbial community; Zinc oxide nanoparticles
资金
- National Natural Science Foundation of China [52079094]
- Project of State Key Laboratory of Water Re-sources & Hydropower Engineering Science [2020LF1003/2019HLG01]
- International Visiting Program for Excellent Young Scholars of Sichuan University (SCU), China
The study found that zinc oxide nanoparticles have a significant impact on anaerobic digestion of cattle manure, promoting the accumulation of organic matter but inhibiting subsequent fermentation and methane production. This inhibitory effect increases with the concentration of zinc oxide nanoparticles, leading to a significant decline in fermentation and methane production.
The increasing use of zinc oxide nanoparticles (ZnO NPs) as feed additives has raised huge environmental concerns in the anaerobic digestion (AD) of livestock wastes. In this study the 30-day effect of ZnO NPs on AD performance of cattle manure was investigated under optimal conditions (temperature-55 degrees C, initial pH-10, total solids contents-10%), which were obtained from response surface methodology. Results showed that ZnO NPs (5-100 mg/g TS) promoted the accumulation of soluble chemical oxygen demand, soluble protein and polysaccharide, but inhibited their following fermentation and methane production processes. This inhibition became stronger as ZnO NPs concentration increased, leading to the methane production declined by 84.55% (5 mg/g TS), 92.39% (30 mg/g TS), and 93.72% (100 mg/g TS), respectively. High-throughput sequencing results demonstrated that the decrease in the abundances of functional bacteria from 72.11% to 11.24% (in families Ruminococcaceae and Lachnospiraceae), and of methanogens from 96.82% to < 1% (in genus Methanothermobacter) led to poor fermentation and methanogenesis, respectively. Predictive functional analysis indicated that ZnO NPs can enhance abundances of AD-friendly functional genes instead of possible genetic expression, resulting in the low methane production. Our findings highlight a deep understanding of the role of ZnO NPs in cattle manure AD and are critical for guiding feed additive application.
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