期刊
RENEWABLE ENERGY
卷 194, 期 -, 页码 28-39出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2022.05.058
关键词
Phytoremediated residues; Anaerobic digestion; Heavy metals; Methane; Microbial community
资金
- National Natural Science Foundation [32070117, 31870082]
- International Science and technology Cooperation project of Gansu Province [2021-0204-GHC-0019]
- Gansu Science and Technology Association project [GKX20210506-16-5]
- Fundamental Research Funds for the Central Universities [lzujbky-2020-29]
In this study, phytoremediated Halogeton glomeratus (H. glomeratus) was used for anaerobic digestion, and it was found that suitable heavy metals (HMs) improved the efficiency of digestion and methane production, while positively correlated to microbiota. Furthermore, the conversion of substrates to methane was improved, and the HMs were successfully removed, reducing secondary pollution.
The phytoremediated plant contains rich carbon resources, but the anaerobic digestion (AD) process can be inhibited due to high Heavy metals (HMs). In this study, the phytoremediated Halogeton glomeratus (H. glomeratus) was utilized in AD. Results showed that suitable HMs improved the AD efficiency, and the HMs were positively correlated to methane production and microbiota. Compared to CK (without HMs contaminated), H. glomeratus containing HMs (TG) enhanced methane production (increased 85.5%). Also, the highest VS removal rate of 66.5% were achieved. Furthermore, the increased of hydrolytic and acidogenic Acinetbacter and Hydrogenophaga improved substrates degradation. Besides, the methanogenic Methanosarcina increased from 6.5 to 89.5%, and the methanogenic pathway shifted from hydrogenotrophic methanogenesis to aceticlastic methanogenesis. Thus, substrates conversion to methane was improved. Finally, the HMs in digestion slurry were successfully removed and decreased its secondary pollution. This study provided a potential for the resourceful utilization of the phytoremediated plants with suitable HMs concentration.(c) 2022 Elsevier Ltd. All rights reserved.
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