Enhanced methane production by using phytoremediated Halogeton glomeratus as substrate via anaerobic digestion

Jing Zhang, Chunlan Mao, Aman Khan, Shuai Zhao, Tianpeng Gao, Margarita Mikhailovna Redina, Qing Zhang, Peizhi Song, Pu Liu and Xiangkai Li

Renewable Energy, 2022, vol. 194, issue C, 28-39

Abstract: 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.

Keywords: Phytoremediated residues; Anaerobic digestion; Heavy metals; Methane; Microbial community (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:194:y:2022:i:c:p:28-39

DOI: 10.1016/j.renene.2022.05.058

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